Virus:TR/Onlinegames.B.10
Date discovered:20/05/2008
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:105.062 Bytes
MD5 checksum:b05ccdac0ea73b5cce8d3157ec7374bb
IVDF version:7.00.04.63 - Tuesday, May 20, 2008

 General Method of propagation:
• Autorun feature


Aliases:
   •  Sophos: Mal/EncPk-CE
   •  Panda: W32/Lineage.KYR
   •  Eset: Win32/PSW.OnLineGames.NLI
   •  Bitdefender: Trojan.Generic.2205115


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%\amvo.exe
   • %drive%\3wcxx91.cmd



The following files are created:

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

– %TEMPDIR%\9f5.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.NSPM.Gen

– %SYSDIR%\amvo0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.NSPM.Gen




It tries to download a file:

– The location is the following:
   • http://www.om7890.com/mf2/**********
Further investigation pointed out that this file is malware, too.

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

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



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.

Description inserted by Petre Galan on Wednesday, November 25, 2009
Description updated by Petre Galan on Wednesday, November 25, 2009

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