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Virus:TR/Obfuscate.BX.116
Date discovered:16/06/2011
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:305.664 Bytes
MD5 checksum:AD95F16360591B4A493BAB90B9DE921B
VDF version:7.11.09.231 - Thursday, June 16, 2011
IVDF version:7.11.09.231 - Thursday, June 16, 2011

 General Aliases:
     Microsoft: Worm:Win32/Taterf.D
AhnLab: Dropper/Win32.OnlineGameHack


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003
    Windows Vista
    Windows Server 2008
    Windows 7


Side effects:
   • Third party control
   • Registry modification
   • Steals information

 Files It copies itself to the following location:
   • %SYSDIR%\v3avast.exe



It deletes the initially executed copy of itself.




It tries to download some files:

The location is the following:
   • **********.baidukch.com/1hg/ah.rar
It is saved on the local hard drive under: %SYSDIR%\sosv3.exe Further investigation pointed out that this file is malware, too.

The location is the following:
   • **********.baidugcd.com/1hg/ah1.rar
It is saved on the local hard drive under: %SYSDIR%\v3avie0.dll Further investigation pointed out that this file is malware, too.

The location is the following:
   • **********.baidugcd.com/1hg/ah1.rar
It is saved on the local hard drive under: %SYSDIR%\v3avmn0.dll Further investigation pointed out that this file is malware, too.

 Registry One of the following values is added in order to run the process after reboot:

  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "V3_reg"="%SYSDIR%\v3avast.exe"
   • "SOS_reg"="%SYSDIR%\sosv3.exe"



The following registry key is added:

[HKLM\SOFTWARE\Classes\CLSID\MADOWN]
   • "urlinfo"="ihfewq.j"

 Process termination Processes with one of the following strings are terminated:
   • avast
   • AVGNT
   • AVP.EXE
   • BitDefender
   • FilMsg
   • HUpdate
   • preupd
   • Twister


 Injection – It injects itself into a process.

    Process name:
   • explorer.exe

   If successful, the malware process terminates while the injected part remains active.

 File details Programming language:
The malware program was written in MS Visual C++.


Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packers:
   • ASPack
   • PolyEnE
   • UPX

Description inserted by Andrei Ilie on Monday, September 26, 2011
Description updated by Andrei Ilie on Monday, September 26, 2011

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