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Virus:TR/Viking.B
Date discovered:20/04/2010
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:128.512 Bytes
MD5 checksum:3333e8f22023aaf4c9d8551b00bae036
IVDF version:7.10.06.145 - Tuesday, April 20, 2010

 General Method of propagation:
    Autorun feature


Aliases:
   •  Sophos: Mal/Taterf-B
   •  Bitdefender: Trojan.Onlinegames.995
   •  Panda: W32/Lineage.LJI
   •  Eset: Win32/PSW.OnLineGames.OUM


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


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

 Files It copies itself to the following locations:
   • %drive%\r3fhr.exe
   • %TEMPDIR%\nodqq.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%\nodqq0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Frethog.F.33




It tries to download a file:

The location is the following:
   • http://www.googleccf.com/1mg/**********




It tries to execute the following file:

Filename:
   • %PROGRAM FILES%\Internet Explorer\IEXPLORE.EXE

 Registry The following registry key is added in order to run the process after reboot:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "nod32"="%TEMPDIR%\nodqq.exe"



The following registry keys are changed:

[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%\nodqq0.dll

    Process name:
   • explorer.exe



It injects itself as a remote thread into a process.

    Process name:
   • iexplore.exe


 File details Programming language:
The malware program was written in MS Visual C++.


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

Description insérée par Petre Galan le mercredi 17 novembre 2010
Description mise à jour par Petre Galan le mercredi 17 novembre 2010

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