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Date discovered:17/06/2010
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:104.476 Bytes
MD5 checksum:6F7D0987DF91CCD605DD2A5DDD8E2987
IVDF version:

 General Method of propagation:
   • Autorun feature

   •  Symantec: W32.Gammima.AG
   •  Kaspersky: Worm.Win32.AutoRun.gbp
   •  TrendMicro: WORM_AUTORUN.DUY
   •  F-Secure: Trojan.PWS.OnLineGames.KCMZ
   •  Bitdefender: Trojan.PWS.OnLineGames.KCMZ
   •  Microsoft: Worm:Win32/Taterf.B
   •  AVG: Worm/AutoRun.GL
   •  PCTools: Worm.AutoRun.gbp
   •  VirusBuster: Worm.Taterf.ACC
   •  Eset: Win32/PSW.OnLineGames.NNU
   •  Sunbelt: Worm.Win32.AutoRun.gbp
   •  GData: Trojan.PWS.OnLineGames.KCMZ
   •  Authentium: W32/Onlinegames.BYF
   •  DrWeb: Trojan.MulDrop.31605
   •  Rising: Trojan.PSW.Win32.GameOnline.eri

Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003
   • Windows Vista
   • Windows Server 2008
   • Windows 7

Side effects:
   • Downloads a file
   • Registry modification

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

It deletes the initially executed copy of itself.

It deletes the following files:
   • C:\fsaht.cmd
   • %TEMPDIR%\am1.rar

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 Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too.

It tries to download a file:

– The location is the following:
It is saved on the local hard drive under: %TEMPDIR%\am1.rar

 Registry The following registry key is added:

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

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

Description inserted by Irina Diaconescu on Tuesday, November 2, 2010
Description updated by Irina Diaconescu on Monday, November 8, 2010

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