TR/OnlineGam.116564 - Trojan

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Full description

Virus:	TR/OnlineGam.116564
Date discovered:	09/12/2008
Type:	Trojan
In the wild:	Yes
Reported Infections:	Low to medium
Distribution Potential:	Low to medium
Damage Potential:	Low to medium
Static file:	Yes
File size:	116.564 Bytes
MD5 checksum:	9eda80b799b87867c6601224dc550d7e
IVDF version:	7.01.00.208

General Method of propagation:
   • Autorun feature

Aliases:
   • Sophos: Mal/EncPk-CE
   • Panda: W32/Lineage.JAW
   • Eset: Win32/PSW.OnLineGames.NMY
   • Bitdefender: Trojan.Generic.2203674

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

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

Files It copies itself to the following locations:
   • %SYSDIR%\ckvo.exe
   • %drive%\hgu.bat

It overwrites a file.
– %SYSDIR%\drivers\vga.sys

The following files are created:

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

– %SYSDIR%\ckvo0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Vundo.Gen

– %TEMPDIR%\xl4wtg77.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.ZPACK.Gen

It tries to download a file:

– The location is the following:
   • http://www.mgmicrosoft.com/xmfx/**********
At the time of writing this file was not online for further investigation.

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

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

The following registry key is added:

– [HKLM\SYSTEM\ControlSet001\Services\KAVsys]
   • "ErrorControl"=dword:0x00000001
   • "ImagePath"="\??\%SYSDIR%\drivers\vga.sys"
   • "Start"=dword:0x00000001
   • "Type"=dword:0x00000001

The following registry keys are changed:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "Hidden"=dword:0x00000002
   • "ShowSuperHidden"=dword:0x00000000

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   Folder\Hidden\SHOWALL]
   New value:
   • "CheckedValue"=dword:0x00000000

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

See a brief description here.

Inserted by Petre Galan on Wed, 17 Feb 2010 16:41 (GMT+1)
Updated by Petre Galan on Wed, 17 Feb 2010 16:45 (GMT+1)

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TR/OnlineGam.116564 - Trojan

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