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Virus:TR/PWS.Ban.104451.A
Date discovered:16/04/2008
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:100.836 Bytes
MD5 checksum:efb9d1c51ca721f98ad30c2b5a781031
IVDF version:7.00.03.175 - Wednesday, April 16, 2008

 General Method of propagation:
    Autorun feature


Aliases:
   •  Panda: W32/Lineage.HVS.worm
   •  Eset: Win32/PSW.OnLineGames.MUU
   •  Bitdefender: Packer.Malware.NSAnti.1


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


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

 Files It copies itself to the following locations:
   • %SYSDIR%\amvo.exe
   • %drive%\3o.exe



It deletes the following file:
   • %TEMPDIR%\%random character string%.sys



The following files are created:

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

%TEMPDIR%\2m9mdmy.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

%TEMPDIR%\%random character string%.sys Further investigation pointed out that this file is malware, too. Detected as: Rkit/Vanti.hl.1




It tries to download a file:

The location is the following:
   • http://www.om7890.com/mf2/**********
At the time of writing this file was not online for further investigation.

 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:

Various Explorer settings:
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "Hidden"=dword:0x00000002
   • "ShowSuperHidden"=dword:0x00000000

Various Explorer settings:
[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, February 24, 2010
Description updated by Andrei Ivanes on Friday, February 26, 2010

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