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Virus:WORM/Agent.105093
Date discovered:21/12/2010
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:105.093 Bytes
MD5 checksum:5af128bd095490f861a257cb0e89947c
VDF version:7.10.07.66
IVDF version:7.11.00.138 - Tuesday, December 21, 2010

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Symantec: W32.Gammima.AG
   •  Kaspersky: Trojan-GameThief.Win32.Magania.biaw
   •  TrendMicro: WORM_GAMETHI.DB
   •  Microsoft: Worm:Win32/Taterf.B
   •  Panda: W32/Lineage.KEE


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003
   • Windows Vista
   • Windows 7


Side effects:
   • Drops files
   • Registry modification

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



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.Taworm.akq

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

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



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

– [HKLM\SYSTEM\ControlSet001\Services\AVPsys]
   • "Type"=dword:00000001
     "Start"=dword:00000003
     "ErrorControl"=dword:00000001
     "ImagePath"="%SYSDIR%\drivers\cdaudio.sys"
     "DisplayName"="AVPsys"

– [HKLM\SYSTEM\CurrentControlSet\Services\AVPsys]
   • "Type"=dword:00000001
     "Start"=dword:00000003
     "ErrorControl"=dword:00000001
     "ImagePath"="%SYSDIR%\drivers\cdaudio.sys"
     "DisplayName"="AVPsys"



The following registry keys are changed:

Various Explorer settings:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   Folder\Hidden\SHOWALL]
   New value:
   • "CheckedValue"=dword:00000000

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "Hidden"=dword:00000002

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "ShowSuperHidden"=dword:00000000

 Miscellaneous  Checks for an internet connection by contacting the following web site:
   • sder44.net

 File details Programming language:
The malware program was written in Borland C++.


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

Description inserted by Andrei Ilie on Thursday, May 5, 2011
Description updated by Andrei Ivanes on Friday, May 20, 2011

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