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Virus:TR/PSW.Online.cfd
Date discovered:11/11/2008
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:110.031 Bytes
MD5 checksum:68e8c119bd02960098965b8f1c92c545
IVDF version:7.01.00.66 - Tuesday, November 11, 2008

 General Methods of propagation:
   • Mapped network drives


Aliases:
   •  Symantec: W32.Gammima.AG
   •  Kaspersky: Worm.Win32.AutoRun.sbz
   •  F-Secure: Worm.Win32.AutoRun.sbz
   •  Panda: W32/Autorun.ALJ.worm
   •  Grisoft: PSW.OnlineGames_r.G
   •  VirusBuster: Worm.Autorun.BSN
   •  Eset: Win32/PSW.OnLineGames.NMY trojan
   •  Bitdefender: Packer.Malware.NSAnti.1


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


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

 Files It copies itself to the following locations:
   • %SYSDIR%\kamsoft.exe
   • C:\whi.com



It deletes the initially executed copy of itself.



The following files are created:

C:\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

%SYSDIR%\drivers\klif.sys Further investigation pointed out that this file is malware, too. Detected as: RKIT/Vanti.HP

%SYSDIR%\gasretyw0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Vundo.Gen




It tries to download a file:

The location is the following:
   • http://zsde4.com/**********/help.rar
It is saved on the local hard drive under: %TEMPDIR%\help.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.XPACK.Gen

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

[HKLM\SYSTEM\ControlSet001\Services\KAVsys]
   • Type=dword:00000001
   • ErrorControl=dword:00000001
   • Start=dword:00000001
   • ImagePath="\??\%SYSDIR%\drivers\klif.sys"

 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 Thomas Wegele on Wednesday, November 12, 2008
Description updated by Thomas Wegele on Wednesday, November 12, 2008

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