Breach at Dickey’s BBQ Smokes 3M Cards

One of the digital underground’s most popular stores for peddling stolen credit card information began selling a batch of more than three million new card records this week. KrebsOnSecurity has learned the data was stolen in a lengthy data breach at more than 100 Dickey’s Barbeque Restaurant locations around the country.

An ad on the popular carding site Joker’s Stash for “BlazingSun,” which fraud experts have traced back to a card breach at Dickey’s BBQ.

On Monday, the carding bazaar Joker’s Stash debuted “BlazingSun,” a new batch of more than three million stolen card records, advertising “valid rates” of between 90-100 percent. This is typically an indicator that the breached merchant is either unaware of the compromise or has only just begun responding to it.

Multiple companies that track the sale in stolen payment card data say they have confirmed with card-issuing financial institutions that the accounts for sale in the BlazingSun batch have one common theme: All were used at various Dickey’s BBQ locations over the past 13-15 months.

KrebsOnSecurity first contacted Dallas-based Dickey’s on Oct. 13. Today, the company shared a statement saying it was aware of a possible payment card security incident at some of its eateries:

“We received a report indicating that a payment card security incident may have occurred. We are taking this incident very seriously and immediately initiated our response protocol and an investigation is underway. We are currently focused on determining the locations affected and time frames involved. We are utilizing the experience of third parties who have helped other restaurants address similar issues and also working with the FBI and payment card networks. We understand that payment card network rules generally provide that individuals who timely report unauthorized charges to the bank that issued their card are not responsible for those charges.”

The confirmations came from Miami-based Q6 Cyber and Gemini Advisory in New York City.

Q6Cyber CEO Eli Dominitz said the breach appears to extend from May 2019 through September 2020.

“The financial institutions we’ve been working with have already seen a significant amount of fraud related to these cards,” Dominitz said.

Gemini says its data indicated some 156 Dickey’s locations across 30 states likely had payment systems compromised by card-stealing malware, with the highest exposure in California and Arizona. Gemini puts the exposure window between July 2019 and August 2020.

“Low-and-slow” aptly describes the card breach at Dickie’s, which persisted for at least 13 months.

With the threat from ransomware attacks grabbing all the headlines, it may be tempting to assume plain old credit card thieves have moved on to more lucrative endeavors. Alas, cybercrime bazaars like Joker’s Stash have continued plying their trade, undeterred by a push from the credit card associations to encourage more merchants to install credit card readers that require more secure chip-based payment cards.

That’s because there are countless restaurant locations — usually franchise locations of an established eatery chain — that are left to decide for themselves whether and how quickly they should make the upgrades necessary to dip the chip versus swipe the stripe.

“Dickey’s operates on a franchise model, which often allows each location to dictate the type of point-of-sale (POS) device and processors that they utilize,” Gemini wrote in a blog post about the incident. “However, given the widespread nature of the breach, the exposure may be linked to a breach of the single central processor, which was leveraged by over a quarter of all Dickey’s locations.”

While there have been sporadic reports about criminals compromising chip-based payment systems used by merchants in the U.S., the vast majority of the payment card data for sale in the cybercrime underground is stolen from merchants who are still swiping chip-based cards.

This isn’t conjecture; relatively recent data from the stolen card shops themselves bear this out. In July, KrebsOnSecurity wrote about an analysis by researchers at New York University, which looked at patterns surrounding more than 19 million stolen payment cards that were exposed after the hacking of BriansClub, a top competitor to the Joker’s Stash carding shop.

The NYU researchers found BriansClub earned close to $104 million in gross revenue from 2015 to early 2019, and listed over 19 million unique card numbers for sale. Around 97% of the inventory was stolen magnetic stripe data, commonly used to produce counterfeit cards for in-person payments.

Visa and MasterCard instituted new rules in October 2015 that put retailers on the hook for all of the losses associated with counterfeit card fraud tied to breaches if they haven’t implemented chip-based card readers and enforced the dipping of the chip when a customer presents a chip-based card.

Dominitz said he never imagined back in 2015 when he founded Q6Cyber that we would still be seeing so many merchants dealing with magstripe-based data breaches.

“Five years ago I did not expect we would be in this position today with card fraud,” he said. “You’d think the industry in general would have made a bigger dent in this underground economy a while ago.”

Tired of having your credit card re-issued and updating your payment records at countless e-commerce sites every time some restaurant you frequent has a breach? Here’s a radical idea: Next time you visit an eatery (okay, if that ever happens again post-COVID, etc), ask them if they use chip-based card readers. If not, consider taking your business elsewhere.

Is Your Chip Card Secure? Much Depends on Where You Bank

Chip-based credit and debit cards are designed to make it infeasible for skimming devices or malware to clone your card when you pay for something by dipping the chip instead of swiping the stripe. But a recent series of malware attacks on U.S.-based merchants suggest thieves are exploiting weaknesses in how certain financial institutions have implemented the technology to sidestep key chip card security features and effectively create usable, counterfeit cards.

A chip-based credit card. Image: Wikipedia.

Traditional payment cards encode cardholder account data in plain text on a magnetic stripe, which can be read and recorded by skimming devices or malicious software surreptitiously installed in payment terminals. That data can then be encoded onto anything else with a magnetic stripe and used to place fraudulent transactions.

Newer, chip-based cards employ a technology known as EMV that encrypts the account data stored in the chip. The technology causes a unique encryption key — referred to as a token or “cryptogram” — to be generated each time the chip card interacts with a chip-capable payment terminal.

Virtually all chip-based cards still have much of the same data that’s stored in the chip encoded on a magnetic stripe on the back of the card. This is largely for reasons of backward compatibility since many merchants — particularly those in the United States — still have not fully implemented chip card readers. This dual functionality also allows cardholders to swipe the stripe if for some reason the card’s chip or a merchant’s EMV-enabled terminal has malfunctioned.

But there are important differences between the cardholder data stored on EMV chips versus magnetic stripes. One of those is a component in the chip known as an integrated circuit card verification value or “iCVV” for short — also known as a “dynamic CVV.”

The iCVV differs from the card verification value (CVV) stored on the physical magnetic stripe, and protects against the copying of magnetic-stripe data from the chip and the use of that data to create counterfeit magnetic stripe cards. Both the iCVV and CVV values are unrelated to the three-digit security code that is visibly printed on the back of a card, which is used mainly for e-commerce transactions or for card verification over the phone.

The appeal of the EMV approach is that even if a skimmer or malware manages to intercept the transaction information when a chip card is dipped, the data is only valid for that one transaction and should not allow thieves to conduct fraudulent payments with it going forward.

However, for EMV’s security protections to work, the back-end systems deployed by card-issuing financial institutions are supposed to check that when a chip card is dipped into a chip reader, only the iCVV is presented; and conversely, that only the CVV is presented when the card is swiped. If somehow these do not align for a given transaction type, the financial institution is supposed to decline the transaction.

The trouble is that not all financial institutions have properly set up their systems this way. Unsurprisingly, thieves have known about this weakness for years. In 2017, I wrote about the increasing prevalence of “shimmers,” high-tech card skimming devices made to intercept data from chip card transactions.

A close-up of a shimmer found on a Canadian ATM. Source: RCMP.

More recently, researchers at Cyber R&D Labs published a paper detailing how they tested 11 chip card implementations from 10 different banks in Europe and the U.S. The researchers found they could harvest data from four of them and create cloned magnetic stripe cards that were successfully used to place transactions.

There are now strong indications the same method detailed by Cyber R&D Labs is being used by point-of-sale (POS) malware to capture EMV transaction data that can then be resold and used to fabricate magnetic stripe copies of chip-based cards.

Earlier this month, the world’s largest payment card network Visa released a security alert regarding a recent merchant compromise in which known POS malware families were apparently modified to target EMV chip-enabled POS terminals.

“The implementation of secure acceptance technology, such as EMV® Chip, significantly reduced the usability of the payment account data by threat actors as the available data only included personal account number (PAN), integrated circuit card verification value (iCVV) and expiration date,” Visa wrote. “Thus, provided iCVV is validated properly, the risk of counterfeit fraud was minimal. Additionally, many of the merchant locations employed point-to-point encryption (P2PE) which encrypted the PAN data and further reduced the risk to the payment accounts processed as EMV® Chip.”

Visa did not name the merchant in question, but something similar seems to have happened at Key Food Stores Co-Operative Inc., a supermarket chain in the northeastern United States. Key Food initially disclosed a card breach in March 2020, but two weeks ago updated its advisory to clarify that EMV transaction data also was intercepted.

“The POS devices at the store locations involved were EMV enabled,” Key Food explained. “For EMV transactions at these locations, we believe only the card number and expiration date would have been found by the malware (but not the cardholder name or internal verification code).”

While Key Food’s statement may be technically accurate, it glosses over the reality that the stolen EMV data could still be used by fraudsters to create magnetic stripe versions of EMV cards presented at the compromised store registers in cases where the card-issuing bank hadn’t implemented EMV correctly.

Earlier today, fraud intelligence firm Gemini Advisory released a blog post with more information on recent merchant compromises — including Key Food — in which EMV transaction data was stolen and ended up for sale in underground shops that cater to card thieves.

“The payment cards stolen during this breach were offered for sale in the dark web,” Gemini explained. “Shortly after discovering this breach, several financial institutions confirmed that the cards compromised in this breach were all processed as EMV and did not rely on the magstripe as a fallback.”

Gemini says it has verified that another recent breach — at a liquor store in Georgia — also resulted in compromised EMV transaction data showing up for sale at dark web stores that sell stolen card data. As both Gemini and Visa have noted, in both cases proper iCVV verification from banks should render this intercepted EMV data useless to crooks.

Gemini determined that due to the sheer number of stores affected, it’s extremely unlikely the thieves involved in these breaches intercepted the EMV data using physically installed EMV card shimmers.

“Given the extreme impracticality of this tactic, they likely used a different technique to remotely breach POS systems to collect enough EMV data to perform EMV-Bypass Cloning,” the company wrote.

Stas Alforov, Gemini’s director of research and development, said financial institutions that aren’t performing these checks risk losing the ability to notice when those cards are used for fraud.

That’s because many banks that have issued chip-based cards may assume that as long as those cards are used for chip transactions, there is virtually no risk that the cards will be cloned and sold in the underground. Hence, when these institutions are looking for patterns in fraudulent transactions to determine which merchants might be compromised by POS malware, they may completely discount any chip-based payments and focus only on those merchants at which a customer has swiped their card.

“The card networks are catching on to the fact that there’s a lot more EMV-based breaches happening right now,” Alforov said. “The larger card issuers like Chase or Bank of America are indeed checking [for a mismatch between the iCVV and CVV], and will kick back transactions that don’t match. But that is clearly not the case with some smaller institutions.”

For better or worse, we don’t know which financial institutions have failed to properly implement the EMV standard. That’s why it always pays to keep a close eye on your monthly statements, and report any unauthorized transactions immediately. If your institution lets you receive transaction alerts via text message, this can be a near real-time way to keep an eye out for such activity.

COVID-19 ‘Breach Bubble’ Waiting to Pop?

The COVID-19 pandemic has made it harder for banks to trace the source of payment card data stolen from smaller, hacked online merchants. On the plus side, months of quarantine have massively decreased demand for account information that thieves buy and use to create physical counterfeit credit cards. But fraud experts say recent developments suggest both trends are about to change — and likely for the worse.

The economic laws of supply and demand hold just as true in the business world as they do in the cybercrime space. Global lockdowns from COVID-19 have resulted in far fewer fraudsters willing or able to visit retail stores to use their counterfeit cards, and the decreased demand has severely depressed prices in the underground for purloined card data.

An ad for a site selling stolen payment card data, circa March 2020.

That’s according to Gemini Advisory, a New York-based cyber intelligence firm that closely tracks the inventories of dark web stores trafficking in stolen payment card data.

Stas Alforov, Gemini’s director of research and development, said that since the beginning of 2020 the company has seen a steep drop in demand for compromised “card present” data — digits stolen from hacked brick-and-mortar merchants with the help of malicious software surreptitiously installed on point-of-sale (POS) devices.

Alforov said the median price for card-present data has dropped precipitously over the past few months.

“Gemini Advisory has seen over 50 percent decrease in demand for compromised card present data since the mandated COVID-19 quarantines in the United States as well as the majority of the world,” he told KrebsOnSecurity.

Meanwhile, the supply of card-present data has remained relatively steady. Gemini’s latest find — a 10-month-long card breach at dozens of Chicken Express locations throughout Texas and other southern states that the fast-food chain first publicly acknowledged today after being contacted by this author — saw an estimated 165,000 cards stolen from eatery locations recently go on sale at one of the dark web’s largest cybercrime bazaars.

“Card present data supply hasn’t wavered much during the COVID-19 period,” Alforov said. “This is likely due to the fact that most of the sold data is still coming from breaches that occurred in 2019 and early 2020.”

A lack of demand for and steady supply of stolen card-present data in the underground has severely depressed prices since the beginning of the COVID-19 pandemic. Image: Gemini Advisory

Naturally, crooks who ply their trade in credit card thievery also have been working from home more throughout the COVID-19 pandemic. That means demand for stolen “card-not-present” data — customer payment information extracted from hacked online merchants and typically used to defraud other e-commerce vendors — remains high. And so have prices for card-not-present data: Gemini found prices for this commodity actually increased slightly over the past few months.

Andrew Barratt is an investigator with Coalfire, the cyber forensics firm hired by Chicken Express to remediate the breach and help the company improve security going forward. Barratt said there’s another curious COVID-19 dynamic going on with e-commerce fraud recently that is making it more difficult for banks and card issuers to trace patterns in stolen card-not-present data back to hacked web merchants — particularly smaller e-commerce shops.

“One of the concerns that has been expressed to me is that we’re getting [fewer] overlapping hotspots,” Barratt said. “For a lot of the smaller, more frequently compromised merchants there has been a large drop off in transactions. Whilst big e-commerce has generally done okay during the COVID-19 pandemic, a number of more modest sized or specialty online retailers have not had the same access to their supply chain and so have had to close or drastically reduce the lines they’re selling.”

Banks routinely take groups of customer cards that have experienced fraudulent activity and try to see if some or all of them were used at the same merchant during a similar timeframe, a basic anti-fraud process known as “common point of purchase” or CPP analysis. But ironically, this analysis can become more challenging when there are fewer overall transactions going through a compromised merchant’s site, Barratt said.

“With a smaller transactional footprint means less Common Point of Purchase alerts and less data to work on to trigger a forensic investigation or fraud alert,” Barratt said. “It does also mean less fraud right now – which is a positive. But one of the big concerns that has been raised to us as investigators — literally asking if we have capacity for what’s coming — has been that merchants are getting compromised by ‘lie in wait’ type intruders.”

Barratt says there’s a suspicion that hackers may have established beachheads [breachheads?] in a number of these smaller online merchants and are simply biding their time. If and when transaction volumes for these merchants do pick up, the concern is then hackers may be in a better position to mix the sale of cards stolen from many hacked merchants and further confound CPP analysis efforts.

“These intruders may have a beachhead in a number of small and/or middle market e-commerce entities and they’re just waiting for the transaction volumes to go back up again and they’ve suddenly got the capability to have skimmers capturing lots of card data in the event of a sudden uptick in consumer spending,” he said. “They’d also have a diverse portfolio of compromise so could possibly even evade common point of purchase detection for a while too. Couple all of that with major shopping cart platforms going out of support (like Magento 1 this month) and furloughed IT and security staff, and there’s a potentially large COVID-19 breach bubble waiting to pop.”

With a majority of payment cards issued in the United States now equipped with a chip that makes the cards difficult and expensive for thieves to clone, cybercriminals have continued to focus on hacking smaller merchants that have not yet installed chip card readers and are still swiping the cards’ magnetic stripe at the register.

Barratt said his company has tied the source of the breach to malware known as “PwnPOS,” an ancient strain of point-of-sale malware that first surfaced more than seven years ago, if not earlier.

Chicken Express CEO Ricky Stuart told KrebsOnSecurity that apart from “a handful” of locations his family owns directly, most of his 250 stores are franchisees that decide on their own how to secure their payment operations. Nevertheless, the company is now forced to examine each store’s POS systems to remediate the breach.

Stuart blamed the major point-of-sale vendors for taking their time in supporting and validating chip-capable payment systems. But when asked how many of the company’s 250 stores had chip-capable readers installed, Stuart said he didn’t know. Ditto for the handful of stores he owns directly.

“I don’t know how many,” he said. “I would think it would be a majority. If not, I know they’re coming.”

How Cybercriminals are Weathering COVID-19

In many ways, the COVID-19 pandemic has been a boon to cybercriminals: With unprecedented numbers of people working from home and anxious for news about the virus outbreak, it’s hard to imagine a more target-rich environment for phishers, scammers and malware purveyors. In addition, many crooks are finding the outbreak has helped them better market their cybercriminal wares and services. But it’s not all good news: The Coronavirus also has driven up costs and disrupted key supply lines for many cybercriminals. Here’s a look at how they’re adjusting to these new realities.

FUELED BY MULES

One of the more common and perennial cybercriminal schemes is “reshipping fraud,” wherein crooks buy pricey consumer goods online using stolen credit card data and then enlist others to help them collect or resell the merchandise.

Most online retailers years ago stopped shipping to regions of the world most frequently associated with credit card fraud, including Eastern Europe, North Africa, and Russia. These restrictions have created a burgeoning underground market for reshipping scams, which rely on willing or unwitting residents in the United States and Europe — derisively referred to as “reshipping mules” — to receive and relay high-dollar stolen goods to crooks living in the embargoed areas.

A screen shot from a user account at “Snowden,” a long-running reshipping mule service.

But apparently a number of criminal reshipping services are reporting difficulties due to the increased wait time when calling FedEx or UPS (to divert carded goods that merchants end up shipping to the cardholder’s address instead of to the mule’s). In response, these operations are raising their prices and warning of longer shipping times, which in turn could hamper the activities of other actors who depend on those services.

That’s according to Intel 471, a cyber intelligence company that closely monitors hundreds of online crime forums. In a report published today, the company said since late March 2020 it has observed several crooks complaining about COVID-19 interfering with the daily activities of their various money mules (people hired to help launder the proceeds of cybercrime).

“One Russian-speaking actor running a fraud network complained about their subordinates (“money mules”) in Italy, Spain and other countries being unable to withdraw funds, since they currently were afraid to leave their homes,” Intel 471 observed. “Also some actors have reported that banks’ customer-support lines are being overloaded, making it difficult for fraudsters to call them for social-engineering activities (such as changing account ownership, raising withdrawal limits, etc).”

Still, every dark cloud has a silver lining: Intel 471 noted many cybercriminals appear optimistic that the impending global economic recession (and resultant unemployment) “will make it easier to recruit low-level accomplices such as money mules.”

Alex Holden, founder and CTO of Hold Security, agreed. He said while the Coronavirus has forced reshipping operators to make painful shifts in several parts of their business, the overall market for available mules has never looked brighter.

“Reshipping is way up right now, but there are some complications,” he said.

For example, reshipping scams have over the years become easier for both reshipping mule operators and the mules themselves. Many reshipping mules are understandably concerned about receiving stolen goods at their home and risking a visit from the local police. But increasingly, mules have been instructed to retrieve carded items from third-party locations.

“The mules don’t have to receive stolen goods directly at home anymore,” Holden said. “They can pick them up at Walgreens, Hotel lobbies, etc. There are a ton of reshipment tricks out there.”

But many of those tricks got broken with the emergence of COVID-19 and social distancing norms. In response, more mule recruiters are asking their hires to do things like reselling goods shipped to their homes on platforms like eBay and Amazon.

“Reshipping definitely has become more complicated,” Holden said. “Not every mule will run 10 times a day to the post office, and some will let the goods sit by the mailbox for days. But on the whole, mules are more compliant these days.”

GIVE AND TAKE

KrebsOnSecurity recently came to a similar conclusion: Last month’s story, “Coronavirus Widens the Money Mule Pool,” looked at one money mule operation that had ensnared dozens of mules with phony job offers in a very short period of time. Incidentally, the fake charity behind that scheme — which promised to raise money for Coronavirus victims — has since closed up shop and apparently re-branded itself as the Tessaris Foundation.

Charitable cybercriminal endeavors were the subject of a report released this week by cyber intel firm Digital Shadows, which looked at various ways computer crooks are promoting themselves and their hacking services using COVID-19 themed discounts and giveaways.

Like many commercials on television these days, such offers obliquely or directly reference the economic hardships wrought by the virus outbreak as a way of connecting on an emotional level with potential customers.

“The illusion of philanthropy recedes further when you consider the benefits to the threat actors giving away goods and services,” the report notes. “These donors receive a massive boost to their reputation on the forum. In the future, they may be perceived as individuals willing to contribute to forum life, and the giveaways help establish a track record of credibility.”

Brian’s Club — one of the underground’s largest bazaars for selling stolen credit card data and one that has misappropriated this author’s likeness and name in its advertising — recently began offering “pandemic support” in the form of discounts for its most loyal customers.

It stands to reason that the virus outbreak might depress cybercriminal demand for “dumps,” or stolen account data that can be used to create physical counterfeit credit cards. After all, dumps are mainly used to buy high-priced items from electronics stores and other outlets that may not even be open now thanks to the widespread closures from the pandemic.

If that were the case, we’d also expect to see dumps prices fall significantly across the cybercrime economy. But so far, those price changes simply haven’t materialized, says Gemini Advisory, a New York based company that monitors the sale of stolen credit card data across dozens of stores in the cybercrime underground.

Stas Alforov, Gemini’s director of research and development, said there’s been no notable dramatic changes in pricing for both dumps and card data stolen from online merchants (a.k.a. “CVVs”) — even though many cybercrime groups appear to be massively shifting their operations toward targeting online merchants and their customers.

“Usually, the huge spikes upward or downward during a short period is reflected by a large addition of cheap records that drive the median price change,” Alforov said, referring to the small and temporary price deviations depicted in the graph above.

Intel 471 said it came to a similar conclusion.

“You might have thought carding activity, to include support aspects such as checker services, would decrease due to both the global lockdown and threat actors being infected with COVID-19,” the company said. “We’ve even seen some actors suggest as much across some shops, but the reality is there have been no observations of major changes.”

CONSCIENCE VS. COMMERCE

Interestingly, the Coronavirus appears to have prompted discussion on a topic that seldom comes up in cybercrime communities — i.e., the moral and ethical ramifications of their work. Specifically, there seems to be much talk these days about the potential karmic consequences of cashing in on the misery wrought by a global pandemic.

For example, Digital Shadows said some have started to question the morality of targeting healthcare providers, or collecting funds in the name of Coronavirus causes and then pocketing the money.

“One post on the gated Russian-language cybercriminal forum Korovka laid bare the question of threat actors’ moral obligation,” the company wrote. “A user initiated a thread to canvass opinion on the feasibility of faking a charitable cause and collecting donations. They added that while they recognized that such a plan was ‘cruel,’ they found themselves in an ‘extremely difficult financial situation.’ Responses to the proposal were mixed, with one forum user calling the plan ‘amoral,’ and another pointing out that cybercrime is inherently an immoral affair.”

Would You Have Fallen for This Phone Scam?

You may have heard that today’s phone fraudsters like to use caller ID spoofing services to make their scam calls seem more believable. But you probably didn’t know that these fraudsters also can use caller ID spoofing to trick your bank into giving up information about recent transactions on your account — data that can then be abused to make their phone scams more believable and expose you to additional forms of identity theft.

Last week, KrebsOnSecurity told the harrowing tale of a reader (a security expert, no less) who tried to turn the tables on his telephonic tormentors and failed spectacularly. In that episode, the people impersonating his bank not only spoofed the bank’s real phone number, but they were also pretending to be him on a separate call at the same time with his bank.

This foiled his efforts to make sure it was really his bank that called him, because he called his bank with another phone and the bank confirmed they currently were in a separate call with him discussing fraud on his account (however, the other call was the fraudster pretending to be him).

Shortly after that story ran, I heard from another reader — we’ll call him “Jim” since he didn’t want his real name used for this story — whose wife was the target of a similar scam, albeit with an important twist: The scammers were armed with information about a number of her recent financial transactions, which he claims they got from the bank’s own automated phone system just by spoofing her phone number.

“When they originally called my wife, there were no fraudulent transactions on her account, but they were able to specify the last three transactions she had made, which combined with the caller-ID had mistakenly earned her trust,” Jim explained. “After we figured out what was going on, we were left asking ourselves how the crooks had obtained her last three transactions without breaking into her account online. As it turned out, calling the phone number on the back of the credit card from the phone number linked with the card provided the most recent transactions without providing any form of authentication.”

Jim said he was so aghast at this realization that he called the same number from his phone and tried accessing his account, which is also at Citi but wholly separate from his spouse’s. Sure enough, he said, as long as he was calling from the number on file for his account, the automated system let him review recent transactions without any further authentication.

“I confirmed on my separate Citi card that they often (but not quite always) were providing the transaction details,” Jim said. “I was appalled that Citi would do that. So, it seemed the crooks would spoof caller ID when calling Citibank, as well as when calling the target/victim.

The incident Jim described happened in late January 2020, and Citi may have changed its procedures since then. But in a phone interview with KrebsOnSecurity earlier this week, Jim made a call to Citi’s automated system from his mobile phone on file with the bank, and I could hear Citi’s systems asking him to enter the last four digits of his credit card number before he could review recent transactions.

The request for the last four of the customer’s credit card number was consistent with my own testing, which relied on a caller ID spoofing service advertised in the cybercrime underground and aimed at a Citi account controlled by this author.

In one test, the spoofed call let KrebsOnSecurity hear recent transaction data — where and when the transaction was made, and how much was spent — after providing the automated system the last four digits of the account’s credit card number. In another test, the automated system asked for the account holder’s full Social Security number.

Citi declined to discuss specific actions it takes to detect and prevent fraud. But in a written statement provided to this author it said the company continuously monitors and analyzes threats and looks for opportunities to strengthen its controls.

“We see regular attempts by fraudsters to gain access to information and we are constantly monitoring for emerging threats and taking preventive action for our clients’ protection,” the statement reads. “For inbound calls to call centers, we continue to adapt and implement detection capabilities to identify suspicious or spoofed phone numbers. We also encourage clients to install and use our mobile app and sign up for push notifications and alerts in the mobile app.”

PREGNANT PAUSES AND BULGING EMAIL BOMBS

Jim said the fraudster who called his wife clearly already knew her mailing and email addresses, her mobile number and the fact that her card was an American Airlines-branded Citi card. The caller said there had been a series of suspicious transactions, and proceeded to read back details of several recent transactions to verify if those were purchases she’d authorized.

A list of services offered by one of several underground stores that sell caller ID spoofing and email bombing services.

Jim’s wife quickly logged on to her Citi account and saw that the amounts, dates and places of the transactions referenced by the caller indeed corresponded to recent legitimate transactions. But she didn’t see any signs of unauthorized charges.

After verifying the recent legitimate transactions with the caller, the person on the phone asked for her security word. When she provided it, there was a long hold before the caller came back and said she’d provided the wrong answer.

When she corrected herself and provided a different security word, there was another long pause before the caller said the second answer she provided was correct. At that point, the caller said Citi would be sending her a new card and that it had prevented several phony charges from even posting to her account.

She didn’t understand until later that the pauses were points at which the fraudsters had to put her on hold to relay her answers in their own call posing as her to Citi’s customer service department.

Not long after Jim’s spouse hung up with the caller, her inbox quickly began filling up with hundreds of automated messages from various websites trying to confirm an email newsletter subscription she’d supposedly requested.

As the recipient of several of theseemail bombing” attacks, I can verify that crooks often will use services offered in the cybercrime underground to flood a target’s inbox with these junk newsletter subscriptions shortly after committing fraud in the target’s name when they wish to bury an email notification from a target’s bank.

‘OVERPAYMENT REIMBURSEMENT’

In the case of Jim’s wife, the inbox flood backfired, and only made her more suspicious about the true nature of the recent phone call. So she called the number on the back of her Citi card and was told that she had indeed just called Citi and requested what’s known as an “overpayment reimbursement.” The couple have long had their credit cards on auto-payment, and the most recent payment was especially high — nearly $4,000 — thanks to a flurry of Christmas present purchases for friends and family.

In an overpayment reimbursement, a customer can request that the bank refund any amount paid toward a previous bill that exceeds the minimum required monthly payment. Doing so causes any back-due interest on that unpaid amount to accrue to the account as well.

In this case, the caller posing as Jim’s wife requested an overpayment reimbursement to the tune of just under $4,000. It’s not clear how or where the fraudsters intended this payment to be sent, but for whatever reason Citi ended up saying they would cut a physical check and mail it to the address on file. Probably not what the fraudsters wanted, although since then Jim and his wife say they have been on alert for anyone suspicious lurking near their mailbox.

“The person we spoke with at Citi’s fraud department kept insisting that yes, it was my wife that called because the call came from her mobile number,” Jim said. “The Citi employee was alarmed because she didn’t understand the whole notion of caller ID spoofing. And we both found it kind of disturbing that someone in fraud at such a major bank didn’t even understand that such a thing was possible.”

SHOPPING FOR ‘CVVs’

Fraud experts say the scammers behind the types of calls that targeted Jim’s family are most likely fueled by the rampant sale of credit card records stolen from hacked online merchants. This data, known as “CVVs” in the cybercrime underground, is sold in packages for about $15 to $20 per record, and very often includes the customer’s name, address, phone number, email address and full credit or debit card number, expiration date, and card verification value (CVV) printed on the back of the card.

A screen shot from an underground store selling CVV records. Note that all of these records come with the cardholder’s address, email, phone number and zip code. Click to enlarge. Image: Gemini Advisory.

Dozens of cybercrime shops traffic in this stolen data, which is more traditionally used to defraud online merchants. But such records are ideally suited for criminals engaged in the type of phone scams that are the subject of this article.

That’s according to Andrei Barysevich, CEO and co-founder of Gemini Advisory, a New York-based company that monitors dozens of underground shops selling stolen card data.

“If the fraudsters already have the target’s cell phone number, in many cases they already have the target’s credit card information as well,” Barysevich said.

Gemini estimates there are currently some 13 million CVV records for sale across the dark web, and that more than 40 percent of these records put up for sale over the past year included the cardholder’s phone number.

Data from recent financial transactions can not only help fraudsters better impersonate your bank, it can also be useful in linking a customer’s account to another account the fraudsters control. That’s because PayPal and a number of other pure-play online financial institutions allow customers to link accounts by verifying the value of microdeposits.

For example, if you wish to be able to transfer funds between PayPal and a bank account, the company will first send a couple of tiny deposits — a few cents, usually — to the account you wish to link. Only after verifying those exact amounts will the account-linking request be granted.

JUST HANG UP

Both this and last week’s story illustrate why the only sane response to a call purporting to be from your bank is to hang up, look up your bank’s customer service number from their Web site or from the back of your card, and call them back yourself.

Meanwhile, fraudsters who hack peoples’ finances with nothing more than a telephone have been significantly upping the volume of attacks in recent months, new research suggests. Fraud prevention company Next Caller said this week it has tracked “massive increases in call volumes and high-risk calls across Fortune 500 companies as a result of COVID-19.”

Image: Next Caller.

“After a brief reprieve in Week 4 (April 6-12), Week 5 (April 13-19) saw call volume across Next Caller’s clients in the telecom and financial services sectors spike 40% above previous highs,” the company found. “Particularly worrisome is the activity taking place in the financial services sector, where call traffic topped previous highs by 800%.”

Next Caller said it’s likely some of that increase was due to numerous online and mobile app outages for many major financial institutions at a time when more than 80 million Americans were simultaneously trying to track the status of their stimulus deposits. But it said that surge also brought with it an influx of fraudsters looking to capitalize on all the chaos.

“High-risk calls to financial services surged to 50% above pre-COVID levels, with one Fortune 100 bank suffering a high-risk increase of 60% during Week 5,” the company wrote in a recent report.

Wawa Breach May Have Compromised More Than 30 Million Payment Cards

In late December 2019, fuel and convenience store chain Wawa Inc. said a nine-month-long breach of its payment card processing systems may have led to the theft of card data from customers who visited any of its 850 locations nationwide. Now, fraud experts say the first batch of card data stolen from Wawa customers is being sold at one of the underground’s most popular crime shops, which claims to have 30 million records to peddle from a new nationwide breach.

On the evening of Monday, Jan. 27, a popular fraud bazaar known as Joker’s Stash began selling card data from “a new huge nationwide breach” that purportedly includes more than 30 million card accounts issued by thousands of financial institutions across 40+ U.S. states.

The fraud bazaar Joker’s Stash on Monday began selling some 30 million stolen payment card accounts that experts say have been tied back to a breach at Wawa in 2019.

Two sources that work closely with financial institutions nationwide tell KrebsOnSecurity the new batch of cards that went on sale Monday evening — dubbed “BIGBADABOOM-III” by Joker’s Stash — map squarely back to cardholder purchases at Wawa.

On Dec. 19, 2019, Wawa sent a notice to customers saying the company had discovered card-stealing malware installed on in-store payment processing systems and fuel dispensers at potentially all Wawa locations.

Pennsylvania-based Wawa says it discovered the intrusion on Dec. 10 and contained the breach by Dec. 12, but that the malware was thought to have been installed more than nine months earlier, around March 4. The exposed information includes debit and credit card numbers, expiration dates, and cardholder names. Wawa said the breach did not expose personal identification numbers (PINs) or CVV records (the three-digit security code printed on the back of a payment card).

A spokesperson for Wawa confirmed that the company today became aware of reports of criminal attempts to sell some customer payment card information potentially involved in the data security incident announced by Wawa on December 19, 2019.

“We have alerted our payment card processor, payment card brands, and card issuers to heighten fraud monitoring activities to help further protect any customer information,” Wawa said in a statement released to KrebsOnSecurity. “We continue to work closely with federal law enforcement in connection with their ongoing investigation to determine the scope of the disclosure of Wawa-specific customer payment card data.”

“We continue to encourage our customers to remain vigilant in reviewing charges on their payment card statements and to promptly report any unauthorized use to the bank or financial institution that issued their payment card by calling the number on the back of the card,” the statement continues. “Under federal law and card company rules, customers who notify their payment card issuer in a timely manner of fraudulent charges will not be responsible for those charges. In the unlikely event any individual customer who has promptly notified their card issuer of fraudulent charges related to this incident is not reimbursed, Wawa will work with them to reimburse them for those charges.”

Gemini Advisory, a New York-based fraud intelligence company, said the biggest concentrations of stolen cards for sale in the BIGBADABOOM-III batch map back to Wawa customer card use in Florida and Pennsylvania, the two most populous states where Wawa operates. Wawa also has locations in Delaware, Maryland, Virginia and the District of Columbia.

According to Gemini, Joker’s Stash has so far released only a small portion of the claimed 30 million. However, this is not an uncommon practice: Releasing too many stolen cards for sale at once tends to have the effect of depressing the overall price of stolen cards across the underground market.

“Based on Gemini’s analysis, the initial set of bases linked to “BIGBADABOOM-III” consisted of nearly 100,000 records,” Gemini observed. “While the majority of those records were from US banks and were linked to US-based cardholders, some records also linked to cardholders from Latin America, Europe, and several Asian countries. Non-US-based cardholders likely fell victim to this breach when traveling to the United States and utilizing Wawa gas stations during the period of exposure.”

Gemini’s director of research Stas Alforov stressed that some of the 30 million cards advertised for sale as part of this BIGBADABOOM batch may in fact be sourced from breaches at other retailers, something Joker’s Stash has been known to do in previous large batches.

Gemini monitors multiple carding sites like Joker’s Stash. The company found the median price of U.S.-issued records in the new Joker’s Stash batch is currently $17, with some of the international records priced as high as $210 per card.

“Apart from banks with a nationwide presence, only financial institutions along the East Coast had significant exposure,” Gemini concluded.

Representatives from MasterCard did not respond to requests for comment. Visa declined to comment for this story, but pointed to a series of alerts it issued in November and December 2019 about cybercrime groups increasingly targeting fuel dispenser merchants.

A number of recent high-profile nationwide card breaches at main street merchants have been linked to large numbers of cards for sale at Joker’s Stash, including breaches at supermarket chain Hy-Vee, restaurant chains Sonic, Buca di Beppo, Krystal, Moe’s, McAlister’s Deli, and Schlotzsky’s, retailers like Bebe Stores, and hospitality brands such as Hilton Hotels.

Most card breaches at restaurants and other brick-and-mortar stores occur when cybercriminals manage to remotely install malicious software on the retailer’s card-processing systems. This type of point-of-sale malware is capable of copying data stored on a credit or debit card’s magnetic stripe when those cards are swiped at compromised payment terminals, and that data can then be used to create counterfeit copies of the cards.

The United States is the last of the G20 nations to make the shift to more secure chip-based cards, which are far more expensive and difficult for criminals to counterfeit. Unfortunately, many merchants have not yet shifted to using chip-based card readers and still swipe their customers’ cards.

According to stats released in November by Visa, more than 3.7 million merchant locations are now accepting chip cards. Visa says for merchants who have completed the chip upgrade, counterfeit fraud dollars dropped 81 percent in June 2019 compared to September 2015. This may help explain why card thieves increasingly are shifting their attention to compromising e-commerce merchants, a trend seen in virtually every country that has already made the switch to chip-based cards.

Many filling stations are upgrading their pumps to include more cyber and physical security — such as end-to-end encryption of card data, custom locks and security cameras. In addition, newer pumps can accommodate more secure chip-based payment cards that are already in use and in some cases mandated by other G20 nations.

But these upgrades are disruptive and expensive, and many fuel station owners are putting them off until it is absolutely necessary. Prior to late 2016, fuel station owners in the United States had until October 1, 2017 to install chip-capable readers at their pumps. Station owners that didn’t have chip-ready readers in place by then would have been on the hook to absorb 100 percent of the costs of fraud associated with transactions in which the customer presented a chip-based card yet was not asked or able to dip the chip.

Yet in December 2016, Visa — by far the largest credit card network in the United States — delayed the requirements, saying fuel station owners would be given until October 1, 2020 to meet the liability shift deadline.

Either way, Wawa could be facing steep fines for failing to protect customer card data traversing its internal payment card networks. In addition, at least one class action lawsuit has already been filed against the company.

Finally, it’s important to note that even if all 30 million of the cards that Joker’s Stash is selling as part of this batch do in fact map back to Wawa locations, it’s highly unlikely that more than a small percentage of these cards will actually be purchased and used by fraudsters. In the 2013 megabreach at Target Corp., for example, fraudsters stole roughly 40 million cards but only ended up selling between one to three million of those cards.

Sale of 4 Million Stolen Cards Tied to Breaches at 4 Restaurant Chains

On Nov. 23, one of the cybercrime underground’s largest bazaars for buying and selling stolen payment card data announced the immediate availability of some four million freshly-hacked debit and credit cards. KrebsOnSecurity has learned this latest batch of cards was siphoned from four different compromised restaurant chains that are most prevalent across the midwest and eastern United States.

An advertisement on the cybercrime store Joker’s Stash for a new batch of ~4 million credit/debit cards stolen from four different restaurant chains across the midwest and eastern United States.

Two financial industry sources who track payment card fraud and asked to remain anonymous for this story said the four million cards were taken in breaches recently disclosed by restaurant chains Krystal, Moe’s, McAlister’s Deli and Schlotzsky’s. Krystal announced a card breach last month. The other three restaurants are all part of the same parent company and disclosed breaches in August 2019.

KrebsOnSecurity heard the same conclusion from Gemini Advisory, a New York-based fraud intelligence company.

“Gemini found that the four breached restaurants, ranked from most to least affected, were Krystal, Moe’s, McAlister’s and Schlotzsky’s,”  Gemini wrote in an analysis of the New World Order batch shared with this author. “Of the 1,750+ locations belonging to these restaurants, nearly 50% were breached and had customer payment card data exposed. These breached locations were concentrated in the central and eastern United States, with the highest exposure in Florida, Georgia, South Carolina, North Carolina, and Alabama.”

McAlister’s (green), Schlotzsky’s (blue), Moe’s (gray), and Krystal (orange) locations across the United States. There is an additional Moe’s location in Hawaii that is not depicted. Image: Gemini Advisory.

Focus Brands (which owns Moe’s, McAlister’s, and Schlotzsky’s) was breached between April and July 2019, and publicly disclosed this on August 23. Krystal claims to have been breached between July and September 2019, and disclosed this in late October.

The stolen cards went up for sale at the infamous Joker’s Stash carding bazaar. The most recent big breach marketed on Joker’s Stash was dubbed “Solar Energy,” and included more than five million cards stolen from restaurants, fuel pumps and drive-through coffee shops operated by Hy-Vee, a supermarket chain based in Iowa.

According to Gemini, Joker’s Stash likely delayed the debut of the New World Order cards to keep from flooding the market with too much stolen card data all at once, which can have the effect of lowering prices for stolen cards across the board.

“Joker’s Stash first announced their breach on November 11, 2019 and published the data on November 22,” Gemini found. “This delay between breaches occurring as early as July and data being offered in the dark web in November appears to be an effort to avoid oversaturating the dark web market with an excess of stolen payment records.”

Most card breaches at restaurants and other brick-and-mortar stores occur when cybercriminals manage to remotely install malicious software on the retailer’s card-processing systems, often by compromising third-party firms that help manage these systems. This type of point-of-sale malware is capable of copying data stored on a credit or debit card’s magnetic stripe when those cards are swiped at compromised payment terminals, and that data can then be used to create counterfeit copies of the cards.

Companies that accept, store, process and transmit credit and debit card payments are required to implement so-called Payment Card Industry (PCI) security standards, but not all entities are required to prove that they have met them. While the PCI standards are widely considered a baseline for merchants that accept payment cards, many security experts advise companies to put in place protections that go well beyond these standards.

Even so, the 2019 Payment Security Report from Verizon indicates the number of companies that maintain full compliance with PCI standards decreased for the second year in a row to just 36.7 percent worldwide.

As noted in previous stories here, the organized cyberthieves involved in stealing card data from main street merchants have gradually moved down the food chain from big box retailers like Target and Home Depot to smaller but far more plentiful and probably less secure merchants (either by choice or because the larger stores became a harder target).

It’s really not worth worrying about where your card number may have been breached, since it’s almost always impossible to say for sure and because it’s common for the same card to be breached at multiple establishments during the same time period.

Just remember that while consumers are not liable for fraudulent charges, it may still fall to you the consumer to spot and report any suspicious charges. So keep a close eye on your statements, and consider signing up for text message notifications of new charges if your card issuer offers this service. Most of these services also can be set to alert you if you’re about to miss an upcoming payment, so they can also be handy for avoiding late fees and other costly charges.

Takeaways from the $566M BriansClub breach

Reporting on the exposure of some 26 million stolen credit cards leaked from a top underground cybercrime store highlighted some persistent and hard truths. Most notably, that the world’s largest financial institutions tend to have a much better idea of which merchants and bank cards have been breached than do the thousands of smaller banks and credit unions across the United States. Also, a great deal of cybercrime seems to be perpetrated by a relatively small number of people.

In September, an anonymous source sent KrebsOnSecurity a link to a nearly 10 gb set of files that included data for approximately 26 million credit and debit cards stolen from hundreds — if not thousands — of hacked online and brick-and-mortar businesses over the past four years.

The data was taken from BriansClub, an underground “carding” store that has (ab)used this author’s name, likeness and reputation in its advertising since 2015. The card accounts were stolen by hackers or “resellers” who make a living breaking into payment card systems online and in the real world. Those resellers then share the revenue from any cards sold through BriansClub.

KrebsOnSecurity shared a copy of the BriansClub card database with Gemini Advisory, a New York-based company that monitors BriansClub and dozens of other carding shops to learn when new cards are added.

Gemini estimates that the 26 million cards — 46 percent credit cards and 54 percent debit cards — represent almost one-third of the existing 87 million credit and debit card accounts currently for sale in the underground.

“While many of these cards were added in previous years, more than 21.6 million will not expire until after October 2019, offering cybercriminal buyers ample opportunity to cash out these records,” Gemini wrote in an analysis of the BriansClub data shared with this author.

Cards stolen from U.S. residents made up the bulk of the data set (~24 million of the 26+ million cards), and as a result these far more plentiful cards were priced much lower than cards from banks outside the U.S. Between 2016 and 2019, cards stolen from U.S.-based bank customers fetched between $12.76 and $16.80 apiece, while non-U.S. cards were priced between $17.04 and $35.70 during the same period.

Image: Gemini Advisory.

Unfortunately for cybercrime investigators, the person who hacked BriansClub has not released (at least not to this author) any information about the BriansClub users, payments, vendors or resellers. [Side note: This hasn’t stopped an unscrupulous huckster from approaching several of my financial industry sources with unlikely offers of said data in exchange for bitcoin].

But the database does have records of which cards were sold and which resellers (identified only by a unique number) supplied those cards, Gemini found.

“While neither the vendor nor the buyer usernames appeared in this database, they were each assigned ID numbers,” Gemini wrote. “This allowed analysts to determine how prolific certain threat actors were on BriansClub and derive relevant metrics from this data.”

According to Gemini, there were 142 resellers and more than 50,000 buyers of the card data sold through BriansClub. These buyers purchased at least 9 million of the 27.2 million cards available.

Image: Gemini Advisory

One reseller in particular (ID: 174,829) offered just shy of 6 million records, posted for $106 million. Of those, almost 940,000 were sold, grossing over $16 million in profits shared between BriansClub and the reseller. In the quote below, a “base” refers to a distinct batch of freshly-stolen card data uploaded to BriansClub.

“For context, the collective price for the entirety of exposed BriansClub records was $566 million, while the total dollar amount of all sold records exceeded $162 million,” Gemini noted. “The top 20 buyers bought 5% of the entire set of records in this shop, while the top 100 buyers accounted for 11%. The shop had a total of 11,000 bases, with most vendors uploading multiple bases.”

Image: Gemini Advisory

All of the 26 million+ card records leaked from BriansClub were shared with multiple trusted sources that work directly with financial institutions to inform them when their customers’ cards go up for sale in the cybercrime underground.

Banks at this point basically have three options. Ignore the report and hope for the best. Cancel the card and reissue. Or monitor the card more closely and place tighter fraud controls on that account.

But here’s the thing: Not all banks got the data at the same time. The larger banks got it first and largely shrugged. At least according to anti-fraud sources at two large U.S.-based financial institutions: Their anti-fraud teams had already identified 90-95 percent of the cards as potentially compromised in one of hundreds of breaches since 2015, mostly those involving malware inside point-of-sale retail checkout systems.

The sources I spoke with at smaller financial institutions found out about the cards they’d issued to customers that wound up in the BriansClub data by receiving alerts last week from Visa and MasterCard. Most of those sources seemed genuinely surprised at the number of cards exposed, and two sources at different credit unions each estimated they were previously unaware of about 80 percent of the cards listed in the alerts from the credit card companies.

Also, smaller financial institutions are far more likely to eat the cost of re-issuing cards at risk of fraudulent use than are larger institutions, which typically have much a higher tolerance for financial losses from counterfeit card fraud. So far, however, there is no evidence this flood of card data intelligence is causing much of a stampede for re-issuing cards.

Visa maintains that smaller financial institutions receive the same alerts sent to larger banks about cards thought to be exposed in specific breaches. The alerts include cards specific to each bank, but smaller banks are often limited in the resources they have available to do much with the reported card data, aside from re-issuing the card.

Gemini CEO and co-founder Andrei Barysevich said so far the feedback from the banks has been all over the place.

“While the larger US banks told us that most of the cards have been previously flagged as compromised, the mid and small size financial institutions were caught completely off-guard,” he said. “As to the European and Asian banks, to them the data was mostly new, in some cases upwards of 60% of cards were still open and active.”

I thought perhaps the card associations could provide some meta-statistics on the BriansClub dump, but also those hopes were dashed. MasterCard did not respond to requests for comment. Visa declined to share any information related to the BriansClub database (even though they got it indirectly care of Yours Truly), but issued the following statement:

“As part of our core mission to ensure security across the payment system, we are very aware of carder forums and other criminal enterprises. Visa continuously invests in intelligence and technology to detect cyber threats and works with law enforcement, clients and other partners, to mitigate and disrupt such threats.

“Whenever we discover compromised account information, Visa uses its payment intelligence and investigative capabilities to determine the source. We also work with our financial institution clients to provide card issuers with the compromised account numbers so they can take steps to protect consumers through independent fraud monitoring and, if needed, by reissuing cards. Incidents such as these reinforce the need for secure technologies such as chip and tokenization to devalue account information so that even if stolen, data cannot be leveraged for fraud.””

Gemini found that exactly two-thirds of the stolen cards (66.6 percent) siphoned from BriansClub were Visa-branded, and 23 percent MasterCard. A full 85% of the total records were EMV (chip) enabled, with the remaining 15% using only a magnetic stripe.

One final note: The Gemini report also challenges claims made by the administrator of BriansClub, namely that he removed the breached cards from his online store and that the data leak stemmed from a breach in February as his site’s data center.

The BriansClub admin, defending the honor of his stolen cards shop after a major breach.

“While the administrator of BriansClub, operating under the moniker ‘Brian Krebs,’ claimed that the breach took place in February 2019, this appears to be false,” Gemini observed in its report. “The number of records from South Korea corresponds to a previous spike in South Korean records that occurred from March 2019 through July 2019. If BriansClub were breached in February, the South Korean-issued cards would number under 10,000 rather than over 1 million.”

The report continues:

“This threat actor also claimed to have removed the compromised records from the shop. Gemini has found this claim to be false as well. Since BriansClub offers a ‘checker service’ for all purchased records to determine whether compromised payment cards are still open, it may be unnecessary to remove the cards. The shop likely assumes that even if the banks received the compromised card data from this breach, they are unlikely to close down and reissue every single card.”

“BriansClub” Hack Rescues 26M Stolen Cards

BriansClub,” one of the largest underground stores for buying stolen credit card data, has itself been hacked. The data stolen from BriansClub encompasses more than 26 million credit and debit card records taken from hacked online and brick-and-mortar retailers over the past four years, including almost eight million records uploaded to the shop in 2019 alone.

An ad for BriansClub has been using my name and likeness for years to peddle millions of stolen credit cards.

Last month, KrebsOnSecurity was contacted by a source who shared a plain text file containing what was claimed to be the full database of cards for sale both currently and historically through BriansClub[.]at, a thriving fraud bazaar named after this author. Imitating my site, likeness and namesake, BriansClub even dubiously claims a copyright with a reference at the bottom of each page: “© 2019 Crabs on Security.”

Multiple people who reviewed the database shared by my source confirmed that the same credit card records also could be found in a more redacted form simply by searching the BriansClub Web site with a valid, properly-funded account.

All of the card data stolen from BriansClub was shared with multiple sources who work closely with financial institutions to identify and monitor or reissue cards that show up for sale in the cybercrime underground.

The leaked data shows that in 2015, BriansClub added just 1.7 million card records for sale. But business would pick up in each of the years that followed: In 2016, BriansClub uploaded 2.89 million stolen cards; 2017 saw some 4.9 million cards added; 2018 brought in 9.2 million more.

Between January and August 2019 (when this database snapshot was apparently taken), BriansClub added roughly 7.6 million cards.

Most of what’s on offer at BriansClub are “dumps,” strings of ones and zeros that — when encoded onto anything with a magnetic stripe the size of a credit card — can be used by thieves to purchase electronics, gift cards and other high-priced items at big box stores.

As shown in the table below (taken from this story), many federal hacking prosecutions involving stolen credit cards will for sentencing purposes value each stolen card record at $500, which is intended to represent the average loss per compromised cardholder.

The black market value, impact to consumers and banks, and liability associated with different types of card fraud.

STOLEN BACK FAIR AND SQUARE

An extensive analysis of the database indicates BriansClub holds approximately $414 million worth of stolen credit cards for sale, based on the pricing tiers listed on the site. That’s according to an analysis by Flashpoint, a security intelligence firm based in New York City.

Allison Nixon, the company’s director of security research, said the data suggests that between 2015 and August 2019, BriansClub sold roughly 9.1 million stolen credit cards, earning the site $126 million in sales (all sales are transacted in bitcoin).

If we take just the 9.1 million cards that were confirmed sold through BriansClub, we’re talking about more than $4 billion in likely losses at the $500 average loss per card figure from the Justice Department.

Also, it seems likely the total number of stolen credit cards for sale on BriansClub and related sites vastly exceeds the number of criminals who will buy such data. Shame on them for not investing more in marketing!

There’s no easy way to tell how many of the 26 million or so cards for sale at BriansClub are still valid, but the closest approximation of that — how many unsold cards have expiration dates in the future — indicates more than 14 million of them could still be valid.

The archive also reveals the proprietor(s) of BriansClub frequently uploaded new batches of stolen cards — some just a few thousand records, and others tens of thousands.

That’s because like many other carding sites, BriansClub mostly resells cards stolen by other cybercriminals — known as resellers or affiliates — who earn a percentage from each sale. It’s not yet clear how that revenue is shared in this case, but perhaps this information will be revealed in further analysis of the purloined database.

BRIANS CHAT

In a message titled “Your site is hacked,’ KrebsOnSecurity requested comment from BriansClub via the “Support Tickets” page on the carding shop’s site, informing its operators that all of their card data had been shared with the card-issuing banks.

I was surprised and delighted to receive a polite reply a few hours later from the site’s administrator (“admin”):

“No. I’m the real Brian Krebs here 🙂

Correct subject would be the data center was hacked.

Will get in touch with you on jabber. Should I mention that all information affected by the data-center breach has been since taken off sales, so no worries about the issuing banks.”

Flashpoint’s Nixon said a spot check comparison between the stolen card database and the card data advertised at BriansClub suggests the administrator is not being truthful in his claims of having removed the leaked stolen card data from his online shop.

The admin hasn’t yet responded to follow-up questions, such as why BriansClub chose to use my name and likeness to peddle millions of stolen credit cards.

Almost certainly, at least part of the appeal is that my surname means “crab” (or cancer), and crab is Russian hacker slang for “carder,” a person who engages in credit card fraud.

Many of the cards for sale on BriansClub are not visible to all customers. Those who wish to see the “best” cards in the shop need to maintain certain minimum balances, as shown in this screenshot.

HACKING BACK?

Nixon said breaches of criminal website databases often lead not just to prevented cybercrimes, but also to arrests and prosecutions.

“When people talk about ‘hacking back,’ they’re talking about stuff like this,” Nixon said. “As long as our government is hacking into all these foreign government resources, they should be hacking into these carding sites as well. There’s a lot of attention being paid to this data now and people are remediating and working on it.”

By way of example on hacking back, she pointed to the 2016 breach of vDOS — at the time the largest and most powerful service for knocking Web sites offline in large-scale cyberattacks.

Soon after vDOS’s database was stolen and leaked to this author, its two main proprietors were arrested. Also, the database added to evidence of criminal activity for several other individuals who were persons of interest in unrelated cybercrime investigations, Nixon said.

“When vDOS got breached, that basically reopened cases that were cold because [the leak of the vDOS database] supplied the final piece of evidence needed,” she said.

THE TARGET BREACH OF THE UNDERGROUND?

After many hours spent poring over this data, it became clear I needed some perspective on the scope and impact of this breach. As a major event in the cybercrime underground, was it somehow the reverse analog of the Target breach — which negatively impacted tens of millions of consumers and greatly enriched a large number of bad guys? Or was it more prosaic, like a Jimmy Johns-sized debacle?

For that insight, I spoke with Gemini Advisory, a New York-based company that works with financial institutions to monitor dozens of underground markets trafficking in stolen card data.

Andrei Barysevich, co-founder and CEO at Gemini, said the breach at BriansClub is certainly significant, given that Gemini currently tracks a total of 87 million credit and debit card records for sale across the cybercrime underground.

Gemini is monitoring most underground stores that peddle stolen card data — including such heavy hitters as Joker’s StashTrump’s Dumps, and BriansDump.

Contrary to popular belief, when these shops sell a stolen credit card record, that record is then removed from the inventory of items for sale. This allows companies like Gemini to determine roughly how many new cards are put up for sale and how many have sold.

Barysevich said the loss of so many valid cards may well impact how other carding stores compete and price their products.

“With over 78% of the illicit trade of stolen cards attributed to only a dozen of dark web markets, a breach of this magnitude will undoubtedly disturb the underground trade in the short term,” he said. “However, since the demand for stolen credit cards is on the rise, other vendors will undoubtedly attempt to capitalize on the disappearance of the top player.”

Liked this story and want to learn more about how carding shops operate? Check out Peek Inside a Professional Carding Shop.