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[Security Alert] Trojan found in two Firefox add-ons

Mozilla has detected Trojans in two experimental Firefox add-ons. The add-ons Sothink Web Video Downloader (V.4) and all versions of Master Filer were found Trojans and it affects Windows users.

If installed, it would be executed when Firefox starts and uninstalling these add-ons does not remove the Trojan from a user’s system. These two add-ons has already been been removed from AMO.

It is said that Sothink Web Video Downloader (v.4) has been downloaded 4,000 times between Feb 2008 - May 2008 and it contain Win32.LdPinch.gen virus.

Master Filer was downloaded approximately 600 times between September 2009 and January 2010 and it contains Win32.Bifrose.32.Bifrose Trojan.

It is important that, if you have installed these two add-ons, you should perform a thorough system scan you system with your antivirus program.

Antivirus programs like Avast, GData, AVG, and McAfee are known to detect the trojans found in the affected add-ons. [Via]


  1. Hi, this is horrible.

    Why mozilla's scanning tool failed to detect these Trojans?


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