Krebs on Security

P.F. Chang’s Confirms Credit Card Breach

June 12, 2014

Nationwide restaurant chain P.F. Chang’s Chinese Bistro on Thursday confirmed news first reported on this blog: That customer credit and debit card data had been stolen in a cybercrime attack on its stores. The company had few additional details to share about the breach, other than to say that it would temporarily be switching to a manual credit card imprinting system for all P.F. Chang’s restaurants in the United States.

In statement released to this reporter this evening, P.F. Chang’s said it first learned of the breach on June 10, the same day this publication pointed to evidence that the eatery chain may have been compromised. Their complete statement is as follows: Continue reading →

Banks: Credit Card Breach at P.F. Chang’s

June 10, 2014

138 Comments

Nationwide chain P.F. Chang’s China Bistro said today that it is investigating claims of a data breach involving credit and debit card data reportedly stolen from restaurant locations nationwide.

On June 9, thousands of newly-stolen credit and debit cards went up for sale on rescator[dot]so, an underground store best known for selling tens of millions of cards stolen in the Target breach. Several banks contacted by KrebsOnSecurity said they acquired from this new batch multiple cards that were previously issued to customers, and found that all had been used at P.F. Chang’s locations between the beginning of March 2014 and May 19, 2014.

Contacted about the banks’ claims, the Scottsdale, Arizona-based restaurant chain said it has not yet been able to confirm a card breach, but that the company “has been in communications with law enforcement authorities and banks to investigate the source.”

“P.F. Chang’s takes these matters very seriously and is currently investigating the situation, working with the authorities to learn more,” the company said in an emailed statement. “We will provide an update as soon as we have additional information.”

A spokesperson for the U.S. Secret Service, which typically investigates breaches involving counterfeit credit and debit cards, declined to comment.

It is unclear how many P.F. Chang’s locations may have been impacted. According to the company’s Wikipedia entry, as of January 2012 there were approximately 204 P.F. Chang’s restaurants in the United States, Puerto Rico, Mexico, Canada, Argentina, Chile and the Middle East. Banks contacted for this story reported cards apparently stolen from PFC locations in Florida, Maryland, New Jersey, Pennsylvania, Nevada and North Carolina.

The new batch of stolen cards, dubbed “Ronald Reagan” by the card shop’s owner, is the first major glut of cards released for sale on the fraud shop since March 2014, when curators of the crime store advertised the sale of some 282,000 cards stolen from nationwide beauty store chain Sally Beauty.

The items for sale are not cards, per se, but instead data copied from the magnetic stripe on the backs of credit cards. Armed with this information, thieves can re-encode the data onto new plastic and then use the counterfeit cards to buy high-priced items at big box stores, goods that can be quickly resold for cash (think iPads and gift cards, for example).

The most common way that thieves steal this type of card data is by hacking into cash registers at retail locations and planting malicious software that surreptitiously records mag stripe data when cards are swiped through the machines. The breaches at Target, Neiman Marcus, Michaels and Sally Beauty all were powered by malware that thieves planted on point-of-sale systems.

Unlike with the Target and Sally Beauty batches, however, the advertisement on Rescator’s shop for cards sold under the Ronald Reagan batch does not list the total number of cards that are for sale currently. Instead, it appears to list just the first 100 pages of results, at approximately 50 cards per page. The cards range in price from $18 to $140 per card. Many factors can influence the price of an individual card, such as whether the card is a Visa or American Express card; similarly, Platinum and Business cards tend to fetch far higher prices than Classic and Standard cards.

A new ad that debuted on June 9 for a fresh batch of cards apparently stolen from PF Chang’s China Bistro locations.

The ad for the Ronald Reagan batch of cards also includes guidance for potential customers who wish to fund their accounts via Western Union or MoneyGram wire transfers, advice that strongly suggests those involved in this apparent heist are once again from Russia and Eastern Europe: Continue reading →

Adobe, Microsoft Push Critical Security Fixes

June 10, 2014

37 Comments

Adobe and Microsoft today each released updates to fix critical security vulnerabilities in their software. Adobe issued patches for Flash Player and AIR, while Microsoft’s Patch Tuesday batch includes seven update bundles to address a whopping 66 distinct security holes in Windows and related products.

The vast majority of the vulnerabilities addressed by Microsoft today are in Internet Explorer, the default browser on Windows machines. A single patch for IE this month (MS14-035) shores up at least 59 separate security issues scattered across virtually every supported version of IE. Other patches fix flaws in Microsoft Word, as well as other components of the Windows operating system itself.

Most of the vulnerabilities Microsoft fixed today earned its “critical” rating, meaning malware or bad guys could exploit the flaws to seize control over vulnerable systems without any help from users, save perhaps for having the Windows or IE user visit a hacked or booby-trapped Web site. For more details on the individual patches, see this roundup at the Microsoft Technet blog.

Adobe’s update for Flash Player fixes at least a half-dozen bugs in the widely-used browser plugin. The Flash update brings the media player to v. 14.0.0.125 on Windows and Mac systems, and v. 11.2.202.378 for Linux users. To see which version of Flash you have installed, check this link.

Continue reading →

Backstage with the Gameover Botnet Hijackers

June 9, 2014

65 Comments

When you’re planning to rob the Russian cyber mob, you’d better make sure that you have the element of surprise, that you can make a clean getaway, and that you understand how your target is going to respond. Today’s column features an interview with two security experts who helped plan and execute last week’s global, collaborative effort to hijack the Gameover Zeus botnet, an extremely resilient and sophisticated crime machine that helped an elite group of thieves steal more than $100 million from banks, businesses and consumers worldwide.

Gameover infections on June 4, 2014. Source: Shadowserver.org

Neither expert I spoke with wished to be identified for this story, citing a lack of permission from their employers and a desire to remain off the radar of the crooks inconvenienced by the action. For obvious reasons, they were also reluctant to share details about the exact weaknesses that were used to hijack the botnet, focusing instead on the planning and and preparation that went into this effort.

GAMEOVER ZEUS PRIMER

A quick review of how Gameover works should help readers get more out of the interview. In traditional botnets, infected PCs report home to and are controlled by a central server. But this architecture leaves such botnets vulnerable to disruption or takeover if authorities or security experts can gain access to the control server.

Gameover, on the other hand, is a peer-to-peer (P2P) botnet designed as a collection of small networks that are distinct but linked up in a decentralized fashion. The individual Gameover-infected PCs are known as “peers.” Above the peers are a select number of slightly more powerful and important infected systems that are assigned roles as “proxy nodes,” meaning they were selected from the peers to serve as relay points for commands coming from the Gameover botnet operators and as conduits for encrypted data stolen from the infected systems.

The basic network structure of the Gameover botnet. Source: FBI

The Gameover botnet code also includes a failsafe mechanism that can be invoked if the botnet’s P2P communications system fails, whether the failure is the result of a faulty malware update or because of a takedown effort by researchers/law enforcement. That failsafe is a domain generation algorithm (DGA) component that generates a list of 1,000 domain names each week (gibberish domains that are essentially long jumbles of letters) combined with one of six top-level domains; .com, .net, .org, .biz, .info and .ru. In the event the infected Gameover systems can’t get new instructions from their peers, the code instructs the botted systems to seek out domains from the latest list of 1,000 domains generated by the DGA until it finds a site with new instructions.

HUNDREDS OF ‘WEB INJECTS’

The Gameover malware was designed specifically to defeat two-factor authentication used by many banks. It did so using a huge collection of custom-made scripts known as “Web injects” that can inject custom content into a Web browser when the victim browses to certain sites — such as a specific bank’s login page. Web injects also are used to prompt the victim to enter additional personal information when they log in to a trusted site. An example of this type of Web inject can be seen in the video below, which shows an inject designed for Citibank customers. Continue reading →

They Hack Because They Can

June 5, 2014

87 Comments

The Internet of Things is coming….to a highway sign near you? In the latest reminder that much of our nation’s “critical infrastructure” is held together with the Internet equivalent of spit and glue, authorities in several U.S. states are reporting that a hacker has once again broken into and defaced electronic road signs over highways in several U.S. states.

Image: WNCN.

Earlier this week, news media in North Carolina reported that at least three highway signs there had apparently been compromised and re-worded to read “Hack by Sun Hacker.” Similar incidents were reported between May 27 and June 2, 2014 in two other states, which spotted variations on that message left by the perpetrator, (including an invitation to chat with him on Twitter).

The attack was reminiscent of a series of incidents beginning two years ago in which various electronic message signs were changed to read “Warning, Zombies Ahead”.

While at least those attacks were chuckle-worthy, messing with traffic signs is no laughing matter: As a report by the Multi-State Information Sharing and Analysis Center (MS-ISAC) points out, changes to road signs create a public safety issue because instead of directing drivers through road hazards, they often result in drivers slowing or stopping to view the signs or take pictures.

That same MS-ISAC notice, obtained by KrebsOnSecurity and published here (PDF), points out that these incidents appear to be encouraged by sloppy security on the part of those responsible for maintaining these signs.

“Investigators in one state believe the compromise may be in part due to the use of weak Simple Network Management Protocol (SNMP) community strings. Investigators in another state believe the malicious actor used Telnet port 23 and a simple password cracker to gain remote access. In one state the malicious actor changed the modem passwords, forcing technicians to restore to factory default settings to regain access.”

Continue reading →

Peek Inside a Professional Carding Shop

June 4, 2014

88 Comments

Over the past year, I’ve spent a great deal of time trolling a variety of underground stores that sell “dumps” — street slang for stolen credit card data that buyers can use to counterfeit new cards and go shopping in big-box stores for high-dollar merchandise that can be resold quickly for cash. By way of explaining this bizarro world, this post takes the reader on a tour of a rather exclusive and professional dumps shop that caters to professional thieves, high-volume buyers and organized crime gangs.

The subject of this post is “McDumpals,” a leading dumps shop that first went online in late April 2013. Featuring the familiar golden arches and the bastardized logo, “i’m swipin’ it,” the site’s mascot is a gangstered-up Ronald McDonald pointing a handgun at the viewer.

Nevermind that this shop is violating a ridiculous number of McDonald’s trademarks in one fell swoop: It’s currently selling cards stolen from data breaches at main street stores in nearly every U.S. state.

Like many other dumps shops, McDumpals recently began requiring potential new customers to pay a deposit (~$100) via Bitcoin before being allowed to view the goods for sale. Also typical of most card shops, this store’s home page features the latest news about new batches of stolen cards that have just been added, as well as price reductions on older batches of cards that are less reliable as instruments of fraud.

I’ve put together a slideshow (below) that steps through many of the updates that have been added to this shop since its inception. One big takeaway from this slideshow is that many shops are now categorizing their goods for sale by the state or region of the victim company.

This was a major innovation that we saw prominently on display in the card shop that was principally responsible for selling cards stolen in the Target and Sally Beauty retail breaches: In those cases, buyers were offered the ability to search for cards by the city, state and ZIP of the Target and Sally Beauty stores from which those cards were stolen. Experienced carders (as buyers are called) know that banks will often flag transactions as suspicious if they take place outside of the legitimate cardholder’s regular geographic purchasing patterns, and so carders tend to favor cards stolen from consumers who live nearby.

The slideshow may make more sense if readers familiarize themselves with a few terms and phrases that show up in the text:

Continue reading →

Ne’er-Do-Well News, Volume I

June 3, 2014

35 Comments

It’s been a while since a new category debuted on this blog, and it occurred to me that I didn’t have a catch-all designation for random ne’er-do-well news. Alas, the inaugural entry for Ne’er-Do-Well News looks at three recent unrelated developments: The availability of remote access iPhone apps written by a programmer perhaps best known for developing crimeware; the return to prison of a young hacker who earned notoriety after simultaneously hacking Paris Hilton’s cell phone and data broker LexisNexis; and the release of Pavel Vrublevsky from a Russian prison more than a year before his sentence was to expire.

ZeusTerm and Zeus Terminal are iPhone/iPad apps designed by the same guy who brought us the Styx-Crypt exploit kit.

A year ago, this blog featured a series of articles that sought to track down the developers of the Styx-Crypt exploit kit, a crimeware package being sold to help bad guys booby-trap compromised Web sites with malware. Earlier this week, I learned that a leading developer of Styx-Crypt — a Ukrainian man named Max Gavryuk — also is selling his own line of remote administration tools curiously called “Zeus Terminal,” available via the Apple iTunes store.

News of the app family came via a Twitter follower who asked to remain anonymous, but who said two of the apps by this author were recently pulled from Apple’s iTunes store, including Zeus Terminal and Zeus Terminal Lite. It’s unclear why the apps were yanked or by whom, but the developer appears to have two other remote access apps for sale on iTunes, including ZeusTerm and ZeusTerm HD.

Incidentally, the support page listed for these apps — zeus-terminal[dot]com — no longer appears to be active (if, indeed it ever was), but the developer lists as his other home page reality7solutions[dot]com, which as this blog has reported was intricately tied to the Styx-Crypt development team.

This wouldn’t be the first time a crimeware author segued into building apps for the iPhone and iPad: In January 2012, as part of my Pharma Wars series, I wrote about clues that strongly suggested the Srizbi/Reactor spam botnet was developed and sold by a guy who left the spam business to build OOO Gameprom, a company that has developed dozens of games available in the iTunes store.

Continue reading →

‘Operation Tovar’ Targets ‘Gameover’ ZeuS Botnet, CryptoLocker Scourge

June 2, 2014

67 Comments

The U.S. Justice Department is expected to announce today an international law enforcement operation to seize control over the Gameover ZeuS botnet, a sprawling network of hacked Microsoft Windows computers that currently infects an estimated 500,000 to 1 million compromised systems globally. Experts say PCs infected with Gameover are being harvested for sensitive financial and personal data, and rented out to an elite cadre of hackers for use in online extortion attacks, spam and other illicit moneymaking schemes.

This graphic, from 2012, shows the decentralized nature of P2P network connectivity of 23,196 PCs infected with Gameover. Image: Dell SecureWorks

The sneak attack on Gameover, dubbed “Operation Tovar,” began late last week and is a collaborative effort by investigators at the FBI, Europol, and the UK’s National Crime Agency; security firms CrowdStrike, Dell SecureWorks, Symantec, Trend Micro and McAfee; and academic researchers at VU University Amsterdam and Saarland University in Germany. News of the action first came to light in a blog post published briefly on Friday by McAfee, but that post was removed a few hours after it went online.

Gameover is based on code from the ZeuS Trojan, an infamous family of malware that has been used in countless online banking heists. Unlike ZeuS — which was sold as a botnet creation kit to anyone who had a few thousand dollars in virtual currency to spend — Gameover ZeuS has since October 2011 been controlled and maintained by a core group of hackers from Russia and Ukraine.

Those individuals are believed to have used the botnet in high-dollar corporate account takeovers that frequently were punctuated by massive distributed-denial-of-service (DDoS) attacks intended to distract victims from immediately noticing the thefts. According to the Justice Department, Gameover has been implicated in the theft of more than $100 million in account takeovers.

The curators of Gameover also have reportedly loaned out sections of their botnet to vetted third-parties who have used them for a variety of purposes. One of the most popular uses of Gameover has been as a platform for seeding infected systems with CryptoLocker, a nasty strain of malware that locks your most precious files with strong encryption until you pay a ransom demand.

According to a 2012 research paper published by Dell SecureWorks, the Gameover Trojan is principally spread via Cutwail, one of the world’s largest and most notorious spam botnets (for more on Cutwail and its origins and authors, see this post). These junk emails typically spoof trusted brands, including shipping and phone companies, online retailers, social networking sites and financial institutions. The email lures bearing Gameover often come in the form of an invoice, an order confirmation, or a warning about an unpaid bill (usually with a large balance due to increase the likelihood that a victim will click the link). The links in the email have been replaced with those of compromised sites that will silently probe the visitor’s browser for outdated plugins that can be leveraged to install malware.

It will be interesting to hear how the authorities and security researchers involved in this effort managed to gain control over the Gameover botnet, which uses an advanced peer-to-peer (P2P) mechanism to control and update the bot-infected systems. Continue reading →

Thieves Planted Malware to Hack ATMs

May 30, 2014

78 Comments

A recent ATM skimming attack in which thieves used a specialized device to physically insert malicious software into a cash machine may be a harbinger of more sophisticated scams to come.

Two men arrested in Macau for allegedly planting malware on local ATMs (shown with equipment reportedly seized from their hotel room).

Authorities in Macau — a Chinese territory approximately 40 miles west of Hong Kong — this week announced the arrest of two Ukrainian men accused of participating in a skimming ring that stole approximately $100,000 from at least seven ATMs. Local police said the men used a device that was connected to a small laptop, and inserted the device into the card acceptance slot on the ATMs.

Armed with this toolset, the authorities said, the men were able to install malware capable of siphoning the customer’s card data and PINs. The device appears to be a rigid green circuit board that is approximately four or five times the length of an ATM card.

According to local press reports (and supplemented by an interview with an employee at one of the local banks who asked not to be named), the insertion of the circuit board caused the software running on the ATMs to crash, temporarily leaving the cash machine with a black, empty screen. The thieves would then remove the device. Soon after, the machine would restart, and begin recording the card and PINs entered by customers who used the compromised machines.

The Macau government alleges that the accused would return a few days after infecting the ATMs to collect the stolen card numbers and PINs. To do this, the thieves would reinsert the specialized chip card to retrieve the purloined data, and then a separate chip card to destroy evidence of the malware. Here’s a look at the devices that Macau authorities say the accused used to insert the malware into ATMs (I’m working on getting clearer photos of this hardware):

Five of the devices Macau police say the thieves used to insert the malware and retrieve stolen data.

Continue reading →

True Goodbye: ‘Using TrueCrypt Is Not Secure’

May 29, 2014

363 Comments

The anonymous developers responsible for building and maintaining the free whole-disk encryption suite TrueCrypt apparently threw in the towel this week, shuttering the TrueCrypt site and warning users that the product is no longer secure now that Microsoft has ended support for Windows XP.

Sometime in the last 24 hours, truecrypt.org began forwarding visitors to the program’s home page on sourceforge.net, a Web-based source code repository. That page includes instructions for helping Windows users transition drives protected by TrueCrypt over to BitLocker, the proprietary disk encryption program that ships with every Windows version (Ultimate/Enterprise ~~or Pro~~) since Vista. The page also includes this ominous warning:

“WARNING: Using TrueCrypt is not secure as it may contain unfixed security issues”

“This page exists only to help migrate existing data encrypted by TrueCrypt.”

“The development of TrueCrypt was ended in 5/2014 after Microsoft terminated support of Windows XP. Windows 8/7/Vista and later offer integrated support for encrypted disks and virtual disk images. Such integrated support is also available on other platforms (click here for more information). You should migrate any data encrypted by TrueCrypt to encrypted disks or virtual disk images supported on your platform.”

Doubters soon questioned whether the redirect was a hoax or the result of the TrueCrypt site being hacked. But a cursory review of the site’s historic hosting, WHOIS and DNS records shows no substantive changes recently.

What’s more, the last version of TrueCrypt uploaded to the site on May 27 (still available at this link) shows that the key used to sign the executable installer file is the same one that was used to sign the program back in January 2014 (hat tip to @runasand and @pyllyukko). Taken together, these two facts suggest that the message is legitimate, and that TrueCrypt is officially being retired.

That was the same conclusion reached by Matthew Green, a cryptographer and research professor at the Johns Hopkins University Information Security Institute and a longtime skeptic of TrueCrypt — which has been developed for the past 10 years by a team of anonymous coders who appear to have worked diligently to keep their identities hidden.

“I think the TrueCrypt team did this,” Green said in a phone interview. “They decided to quit and this is their signature way of doing it.”

Green last year helped spearhead dual crowdfunding efforts to raise money for a full-scale, professional security audit of the software. That effort ended up pulling in more than $70,000 (after counting the numerous Bitcoin donations) — far exceeding the campaign’s goal and demonstrating strong interest and support from the user community. Earlier this year, security firm iSEC Partners completed the first component of the code review: an analysis of TrueCrypt’s bootloader (PDF). Continue reading →

Last »