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Virus:Worm/Taterf.B.31
Date discovered:26/05/2009
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:106.496 Bytes
MD5 checksum:dcffbe0beb44af48f72d94055952429c
IVDF version:7.01.04.14 - Tuesday, May 26, 2009

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Mcafee: Generic PWS.y
   •  Panda: W32/Lineage.LHR
   •  Eset: Win32/PSW.OnLineGames.NNU
   •  Bitdefender: Trojan.Generic.IS.439514


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:
   • %TEMPDIR%\xvassdf.exe
   • %drive%\o02nya.exe



It deletes the initially executed copy of itself.



The following files are created:

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

%TEMPDIR%\4tddfwq0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Frethog.F.3




It tries to download a file:

– The location is the following:
   • http://www.googler0w.com/1rb/**********




It tries to executes the following file:

– Filename:
   • "%PROGRAM FILES%\Internet Explorer\iexplore.exe"

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

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "54dfsger" = "%TEMPDIR%\xvassdf.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

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   New value:
   • "NoDriveTypeAutoRun"=dword:0x00000091

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   Folder\Hidden\SHOWALL]
   New value:
   • "CheckedValue"=dword:0x00000000

 Injection –  It injects the following file into a process: %TEMPDIR%\4tddfwq0.dll

    Process name:
   • explorer.exe



– It injects itself as a remote thread into a process.

    Process name:
   • iexplore.exe


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

Descripción insertada por Petre Galan el jueves, 8 de abril de 2010
Descripción actualizada por Petre Galan el jueves, 8 de abril de 2010

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