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Virus:TR/Assist.aft
Date discovered:17/11/2009
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:57.344 Bytes
MD5 checksum:b28e967136727edb5e8e285c4433214d
IVDF version:7.01.06.245 - Tuesday, November 17, 2009

 General Aliases:
   •  Mcafee: W32/Koobface.worm.gen.d
   •  Sophos: W32/Koobface-R
   •  Panda: W32/Koobface.FL.worm
   •  Eset: Win32/Koobface.NCL
   •  Bitdefender: Win32.Worm.Koobface.AMS


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Downloads a malicious file
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following location:
   • %WINDIR%\freddy74.exe



It deletes the initially executed copy of itself.



It deletes the following files:
   • C:\vx\sd.dat
   • %WINDIR%\dxxdv34567.bat
   • c:\3.reg



The following files are created:

– c:\3.reg This is a non malicious text file with the following content:
   • %code that runs malware%

%WINDIR%\dxxdv34567.bat Furthermore it gets executed after it was fully created. This batch file is used to delete a file.
%malware execution directory%\sd.dat
%malware execution directory%\df1a245s4_1852.exe
%WINDIR%\bk23567.dat



It tries to download a file:

– The locations are the following:
   • http://inartdesigns.com/**********/?action=fbgen&v=74
   • http://mycleveridea.co.za/**********/?getexe=fb.101.exe
   • http://inartdesigns.com/**********

 Registry The following registry key is added:

– [HKCR\Mime\Database\Content Type\application/xhtml+xml]
   • "CLSID"="{25336920-03F9-11cf-8FD0-00AA00686F13}"
   • "Encoding"=hex:08,00,00,00
   • "Extension"=".xml"

 Miscellaneous  Checks for an internet connection by contacting the following web site:
   • http://www.google.com

 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

說明撰寫者 Petre Galan 開啟 2010年3月17日星期三
說明更新者 Petre Galan 開啟 2010年3月18日星期四

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