A new variant of the Gameover banking Trojan is expanding beyond the financial sector to target vulnerable job seekers and recruiters by stealing log-in credentials for the two largest employment sites on the web.
Users of both Monster.com and CareerBuilder.com are now being targeted in a unified campaign that uses the bug to draw out personally identifiable information.
Gameover first nabbed headlines for nabbing people’s money back in 2012 when the FBI warned that a phishing campaign was delivering a new variant of the Zeus financial malware. A Zeus variant that came about after the Zeus source code was leaked in 2011, Gameover employs the traditional and configurable ‘man-in-the-browser’ injection technique where it can access the user’s bank details before they are encrypted and after they are decrypted. However, one of the main differences between Zeus and Gameover is that the latter is controlled via a distributed command-and-control infrastructure.
According to an F-secure analysis, the new gambit is using a fresh configuration file to carry out the dirty work. “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.”
In and of itself, the log-in credentials for a job-hunting site wouldn’t seem to be all that valuable to criminals. But the real gambit comes with the second part of the attack. After users authenticate to the faux page, they are then redirected again to a page with an injected form that appears to legitimately ask three security questions. These are selected and presented randomly from a list of 18, asking things like, “what are the last 5 digits / letters of your driver\’s license number?” or “what was the city where you were married?” These are typical security questions used by a host of financial sites and others – knowing the answers at Monster.com can thus help the crooks get by security at other sites, especially if the victim uses the same password for multiple services.
This article has been extracted from http://www.infosecurity-magazine.com, please click on this link http://www.infosecurity-magazine.com/view/37690/gameover-trojan-morphs-to-target-monster-and-careerbuilder-websites/
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