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Virus:TR/OnlineGam.105329
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:105.329 Bytes
MD5 checksum:6f948634ab0cbde9ecf77871a3930660
VDF version:7.01.06.180
IVDF version:7.01.06.185 - Tuesday, November 3, 2009

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Sophos: W32/Taterf-C
   •  Bitdefender: Trojan.Generic.2292932
   •  Panda: W32/Autorun.JBX
   •  Eset: Win32/PSW.OnLineGames.NNU


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


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

 Files It copies itself to the following locations:
   • %SYSDIR%\olhrwef.exe
   • %drive%\gpcdt.cmd



It deletes the initially executed copy of itself.



It deletes the following file:
   • %SYSDIR%\drivers\cdaudio.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%\nmdfgds0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Magania.bhjx




It tries to execute 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]
   • "cdoosoft"="%SYSDIR%\olhrwef.exe"



The following registry key is added:

– [HKLM\SOFTWARE\Classes\CLSID\MADOWN]
   • "urlinfo"="%character string%"



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%\nmdfgds0.dll

    Process name:
   • explorer.exe



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

    Process name:
   • iexplore.exe


 Miscellaneous Accesses internet resources:
   • http://ngjk34.net/mg/**********

 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 Wednesday, January 26, 2011
Description updated by Petre Galan on Wednesday, January 26, 2011

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