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Sunday, 31 May 2009

PC-pwning infection hits 30,000 legit websites

A nasty infection that attempts to install a potent malware cocktail on the machines of end users has spread to about 30,000 websites run by businesses, government agencies and other organizations, researchers warned Friday.

The infection sneaks malicious javascript onto the front page of websites, most likely by exploiting a common application that leads to a SQL injection, said Stephan Chenette, manager for security research at security firm Websense. The injected code is designed to look like a Google Analytics script, and it uses obfuscated javascript, so it is hard to spot.

The malicious payload silently redirects visitors of infected sites to servers that analyze the end-user PC. Based on the results, it attempts to exploit one or more of about 10 different unpatched vulnerabilities on the visitor's machine. If none exist, the webserver delivers a popup window that claims the PC is infected in an attempt to trick the person into installing rogue anti-virus software.

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