A new version of the Zeus password-stealing malware is on the loose and already has infected one in every 3,000 computers monitored by a Web security firm that works to protect more than 6 million end users.

New York-based Trusteer said the new version, known as Version 1.4 or Version 2, targets Firefox browsers and uses advanced polymorphic techniques to thwart antivirus software.

Trusteer said its Flashlight remote fraud investigation and mitigation service already has linked the latest version of Zeus, also known as Zbot, with fraud against commercial and consumer bankers in North America and the United Kingdom.

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