Virus:TR/PSW.Frethog.AJ.3
Date discovered:23/12/2008
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:119.919 Bytes
MD5 checksum:2b724e1af3f32add856b8be8134ce2cd
IVDF version:7.01.01.23 - Tuesday, December 23, 2008

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan-GameThief.Win32.Magania.aozb
   •  F-Secure: Trojan-GameThief.Win32.Magania.aozb


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


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

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



It deletes the initially executed copy of itself.



The following files are created:

– %SYSDIR%\drivers\klif.sys Further investigation pointed out that this file is malware, too. Detected as: TR/Drop.Onlinegames2

– %SYSDIR%\tavo0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/DLL.Onlinegames.B




It tries to download some files:

– The location is the following:
   • http://adeui.com/**********/ff.exe
It is saved on the local hard drive under: %TEMPDIR%\ff.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Onlinegames.CP


– The location is the following:
   • http://adeui.com/**********/cc.exe
It is saved on the local hard drive under: %TEMPDIR%\cc.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Onlinegames.CP

 Registry The following registry key is added in order to run the process after reboot:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • tava="%SYSDIR%\tavo.exe"

 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 a runtime packer.

Description inserted by Thomas Wegele on Tuesday, December 23, 2008
Description updated by Thomas Wegele on Wednesday, December 24, 2008

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