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Re: [security] Trojan downloader may be dropping FireFox and IE specific

Subject: Re: [security] Trojan downloader may be dropping FireFox and IE specific components
Date: Wed, 26 Jul 2006 15:09:52 -0700
Say it is so.... Malware is big business.

Opera just has a "month o browser bugs' posted up on Metasploit.

As long as we're running with admin rights... malware has easy pickin's.......

http://msmvps.com/blogs/harrywaldron/archive/2006/07/26/105854.aspx
http://browserfun.blogspot.com/2006/07/mobb-26-opera-css-background.html

Hayes, Bill wrote:

While reading a couple of recent entries in security bogs by McAfee and Symantec, I had 
one of those "say it isn't so" momements. A careful read of the descriptions by 
McAfee of the Trojan Downloader Downloader-AXM and McAfee's description of Formspy for 
Firefox and Symantec's description of Haxdoor for IE seems to indicate that 
Downloader-AXM is able to distinguish between system configurations and install malware 
specifically developed for either Firefox or IE boxes.

I haven't been able to find out any further info from other virus 
encyclopedias. Hopefully they should have entries soon.

Formspy was detected by Mcafee today (July 25th) and Haxdoor-0 by Symantec yesterday 
(July 24th). Both are currently being spammed by an e-mail note purporing to be an order 
confirmation.  McAfee does have the full text of the spam in its description of 
Downloader-AXM. According to McAfee, the downloader is present in an attachment called 
"wc2905036.exe".

Symantec says in its blog that Haxdoor is downloaded through an attachment it calls WC2905036.zip which yields WC2905036.exe, and in passing that the spammed note is a bogus order confirmation.

Symantec states that there have been two different versions of the e-mail 
message and two different attachments. They don't say if the file name remained 
the same. So, are we looking at backdoors that use two separate downloaders or 
one downloader for two different malware installations? This would also 
indicate that the same folks are behind both Formspy and Haxdoor-0. Symantec 
states that this version of Haxdoor may be of Russian origin.

References:

AvertLabs blog - http://www.avertlabs.com/research/blog/?p=62
FormSpy Downloader - http://vil.nai.com/vil/content/v_140257.htm
FormSpy - http://vil.nai.com/vil/content/v_140256.htm
Backdoor.Haxdoor-0 - 
http://www.symantec.com/enterprise/security_response/writeup.jsp?docid=2006-072413-3859-99
Symantec Security Response Weblog - 
http://www.symantec.com/enterprise/security_response/weblog/2006/07/there_they_go_again_1.html
      
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