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News

Financial Malware Version of Ramnit Discovered

Trusteer : 24 August, 2011  (Technical Article)
Trusteer uncovers further financial malware in the form of Ramnit configuration able to inject HTML code into the browser
Financial Malware Version of Ramnit Discovered
Trusteer has discovered the 18 month old file infecting worm Win32.Ramnit has morphed into financial malware and is actively attacking banks to commit online fraud. Ramnit configurations captured and reverse engineered by Trusteer were found to incorporate tactics from the Zeus financial malware platform. Ramnit has borrowed from Zeus the ability to inject HTML code into a web browser, which it is using to bypass two-factor authentication and transaction signing systems used by financial institutions to protect online banking sessions.

The financial malware version of Ramnit was discovered by Trusteer’s fraud analysts using the Trusteer Pinpoint zero-day anomaly detection system and Trusteer Flashlight remote incident investigation system. Ramnit’s command and control servers are located in Germany and are currently live. According to the Symantec Intelligence Report for July, Ramnit accounts for 17.3 percent of all new malicious software infections. This number is consistent with Trusteer's findings that tens of thousands of machines used for online banking are currently infected with Ramnit.

Ramnit was first detected in 2010 and targets .EXE, .SCR, .DLL. .HTML and other file types. File infection is an old school virus technique that is rarely seen in modern financial malware. The evolution of Ramnit into a fraud tool was made possible when the source code of the notorious Zeus financial malware platform was made freely available on the Internet earlier this year. Since then, fraudsters and malware authors have borrowed parts of the Zeus toolkit and incorporated into other malware. Trusteer researchers found the method used to configure Ramnit to target a specific bank is identical to the one used by Zeus. This allows fraudsters who have written configurations for Zeus to easily port their configuration to Ramnit.

“The metamorphosis of Ramnit into financial malware is a sign of things to come now that the Zeus source code has been made openly available to anyone on the Internet,” said Amit Klein, CTO of Trusteer. “Unlike the past, when financial institutions had to defend against a limited number of malware platforms, attacks can now come from virtually any malicious software program -- old or new. The malware distribution channel for fraudsters has increased in scale significantly.”      

Trusteer Pinpoint is capable of detecting and blocking Ramnit-related and zero-day fraud within a bank’s web application, while Trusteer Rapport is capable of detecting, blocking, and preventing Ramnit infections on customer computers. More information on Ramnit, its configurations, and the code it uses against various banks is available to Trusteer customers in the Trusteer Situation Room. 
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