Hackers Infiltrate Jimmy Johns

Sandwich restaurant chain Jimmy John’s said there was a potential data breach involving customers’ credit and debit card information at 216 of its stores and franchised locations on July 30.

An intruder stole log-in credentials from the company’s vendor and used the credentials to remotely access the point-of-sale systems at some corporate and franchised locations between June 16 and Sept. 5, the company said.

The chain is the latest victim in a series of security breaches among retailers such as Target Corp, Michaels Stores Inc and Neiman Marcus.

Home Depot Inc  said last week some 56 million payment cards were likely compromised in a cyberattack at its stores, suggesting the hacking attack at the home improvement chain was larger than the breach at Target Corp.

More than 12 of the affected Jimmy John’s stores are in Chicago area, according to a list disclosed by the company.

The breach has been contained and customers can use their cards at its stores, the privately held company said.

Jimmy John’s said it has hired forensic experts to assist with its investigation.

“Cards impacted by this event appear to be those swiped at the stores, and did not include those cards entered manually or online,” Jimmy John’s said.

The Champaign, Illinois-based company said stolen information may include the card number and in some cases the cardholder’s name, verification code, and/or the card’s expiration date.

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Malware Targets Job-seekers

A new version of the Gameover computer Trojan is targeting job hunters and recruiters by attempting to steal log-in credentials for Monster.com and CareerBuilder.com accounts.

Gameover is one of several Trojan programs that are based on the infamous Zeus banking malware, whose source code was leaked on the Internet in 2011. Like Zeus, Gameover can steal log-in credentials and other sensitive information by injecting rogue Web forms into legitimate websites when accessed from infected computers.

The ability to inject content into browsing sessions in real time has traditionally been used by computer Trojans to steal online banking credentials and financial information. However, cybercriminals are increasingly using this technique to compromise other types of accounts as well.

For example, in February, researchers from security firm Adallom found a Zeus variant that stole Salesforce.com log-in credentials and scraped business data from the compromised accounts.

The latest development involves a new Gameover variant that contains a configuration file to target Monster.com accounts, one of the largest employment websites in the world, security researchers from antivirus firm F-Secure said.

“A computer infected with Gameover ZeuS will inject a new ‘Sign In’ button [into the Monster.com sign-in page], but the page looks otherwise identical,” they said.

After the victims authenticate through the rogue Web form the malware injects a second page that asks them to select and answer three security questions out of 18. The answers to these questions expose additional personal information and potentially enable attackers to bypass the identity verification process.

Targeting Monster.com is a new development, but the Gameover malware had already been targeting CareerBuilder.com, another large employment website, for some time.

Recruiters with accounts on employment websites should be wary of irregularities on log-in pages, especially if those accounts are tied to bank accounts and spending budgets, the F-Secure researchers said. “It wouldn’t be a bad idea for sites such as Monster to introduce two factor authentication beyond mere security questions.”

The authors of the Gameover Trojan program have been particularly active recently. In early February researchers from security firm Malcovery Security reported that a new variant of Gameover was being distributed as an encrypted .enc file in order to bypass network-level defenses. Later that month researchers from Sophos detected a Gameover variant with a kernel-level rootkit component that protected its files and processes, making it harder to remove.

Unlike most other Zeus spinoffs, Gameover is also using peer-to-peer technology for command-and-control instead of traditional hosted servers, which improves its resilience to takedown efforts by security researchers.

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