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Virus:TR/Obfuscate.BX.108
Date discovered:08/06/2011
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:204.800 Bytes
MD5 checksum:2847D66ADCBE7398C6920DDF2A6271A3
VDF version:7.11.09.98 - Wednesday, June 8, 2011
IVDF version:7.11.09.98 - Wednesday, June 8, 2011

 General Aliases:
   •  Kaspersky: Trojan.Win32.Agent2.dnxo
   •  TrendMicro: TROJ_GEN.RC1C2F7
   •  Microsoft: Worm:Win32/Taterf.D


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%\arking.exe



It deletes the initially executed copy of itself.




It tries to download some files:

– The location is the following:
   • http://www.**********dutew.com/1mg/am.rar
It is saved on the local hard drive under: %SYSDIR%\arking0.dll Further investigation pointed out that this file is malware, too.

– The location is the following:
   • http://www.**********dutew.com/1mg/am.rar
It is saved on the local hard drive under: %SYSDIR%\arking.exe Further investigation pointed out that this file is malware, too.

– The location is the following:
   • http://www.**********dugiu.com/1mg/am1.rar
It is saved on the local hard drive under: %SYSDIR%\arking1.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]
   • "King_ar"="%SYSDIR%\arking.exe"



The following registry key is added:

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

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

Description inserted by Andrei Ilie on Friday, September 2, 2011
Description updated by Andrei Ilie on Monday, September 26, 2011

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