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Mozilla Firefox Security Update

Posted: Fri Nov 12, 2010 12:43 pm
by John Baird
On two occassions I have received a pop up panel requesting the installation of a security update for Firefox. After installation Spybot detects a Trojan kind TrojansC-05 called Win32.Agent.wu located in c:\windows\system32\updater.exe. The file properties look authentic.
I have removed this file using Spybot Fix.
Also neither Adaware or Avast detect this file/Trojan.
Any comments on the authenticity of this file would be appreciated.

Re: Mozilla Firefox Security Update

Posted: Fri Nov 12, 2010 6:27 pm
by LarryK
I googled this

http://www.microsoft.com/security/porta ... 2147343220

Could be a new variant, they tend to do that.

Best you do a full AV scan, Malware scan etc, and see what turns up.

Re: Mozilla Firefox Security Update

Posted: Sat Nov 13, 2010 9:03 pm
by CoreyPlover
Based on the Spybot detection and the various links upon searching for Win32.Agent.wu and "windows/system32/updater.exe" I'd be pretty confident this is an infected file.

If you ever have files that you are unsure of whether they are an infected piece of malware, or a genuine system file, you should rename its extension (say, to ".old" or ".tmp") and move it to a temporary directory. That way, if it turns out to be a necessary piece of software, you can easily restore it. If not, you can delete it.

MalwareBytes is my preferred malware scanner; seems very effective at detecting newer variants of malware.