Virus:TR/OnlineGam.106147
Date discovered:03/11/2009
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:106.174 Bytes
MD5 checksum:cc2d424a063ef6d5dc156f73de8bd55a
IVDF version:7.01.06.185 - Tuesday, November 3, 2009

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Mcafee: Generic PWS.ak trojan
   •  Panda: W32/Lineage.KEF
   •  Bitdefender: Trojan.PWS.OnlineGames.AAFJ


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%\kamsoft.exe
   • %drive%\yannh.cmd



It deletes the initially executed copy of itself.



It deletes the following file:
   • %SYSDIR%\drivers\klif.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%\drivers\klif.sys Further investigation pointed out that this file is malware, too. Detected as: RKit/OnlineGames.AP

– %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/xmfx/**********




It tries to executes the following file:

– Filename:
   • "%PROGRAM FILES%\Internet Explorer\IEXPLORE.EXE"

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

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



The following registry keys are added in order to load the service after reboot:

– [HKLM\System\CurrentControlSet\Services\KAVsys]
   • "ErrorControl"=dword:0x00000001
   • "ImagePath"="\??\%SYSDIR%\drivers\klif.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

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   New value:
   • "NoDriveTypeAutoRun"=dword:0x00000091

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

 Injection –  It injects the following file into a process: %SYSDIR%\gasretyw0.dll

    Process name:
   • explorer.exe



– It injects itself as a remote thread into a process.

    Process name:
   • iexplore.exe


 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 Petre Galan on Monday, July 5, 2010
Description updated by Petre Galan on Monday, July 5, 2010

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