Virus:TR/Onlinegames.B.23
Date discovered:19/05/2008
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:106.068 Bytes
MD5 checksum:8b6cbd31dbb740d3140d9c7bb2a7db86
IVDF version:7.00.04.62 - Monday, May 19, 2008

 General Aliases:
   •  Mcafee: PWS
   •  Sophos: Mal/EncPk-CE
   •  Panda: W32/Autorun.RE.worm
   •  Eset: Win32/PSW.OnLineGames.NLI
   •  Bitdefender: Trojan.PWS.LMir.UMA


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


Side effects:
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following location:
   • %SYSDIR%\amvo.exe



The following files are created:

– C:\Temp\7eb4nf.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.XPACK.Gen

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

 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 added:

– [HKLM\SYSTEM\CurrentControlSet\Enum\Root\
   LEGACY_DERTYHJUISHWKYOZDEMCXERPOGSE]
   • "NextInstance"=dword:0x00000001

– [HKLM\SYSTEM\CurrentControlSet\Enum\Root\
   LEGACY_DERTYHJUISHWKYOZDEMCXERPOGSE\0000]
   • "Class"="LegacyDriver"
   • "ClassGUID"="{8ECC055D-047F-11D1-A537-0000F8753ED1}"
   • "ConfigFlags"=dword:0x00000000
   • "DeviceDesc"="dertyhjuishwkyozdemcxerpogse"
   • "Legacy"=dword:0x00000001
   • "Service"="dertyhjuishwkyozdemcxerpogse"

– [HKLM\SYSTEM\CurrentControlSet\Enum\Root\
   LEGACY_DERTYHJUISHWKYOZDEMCXERPOGSE\0000\Control]
   • "*NewlyCreated*"=dword:0x00000000
   • "ActiveService"="dertyhjuishwkyozdemcxerpogse"

 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 Friday, November 13, 2009
Description updated by Petre Galan on Friday, November 13, 2009

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