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Virus:Worm/Autorun.bhkp
Date discovered:08/07/2010
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:94.893 Bytes
MD5 checksum:712ab2776ac05ac1cbf5bfa1843ceecc
VDF version:7.10.03.239
IVDF version:7.10.09.47 - Thursday, July 8, 2010

 General Method of propagation:
   • Autorun feature


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


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

 Files It copies itself to the following locations:
   • %SYSDIR%\amvo.exe
   • %drive%\t0k3c.cmd



It deletes the initially executed copy of itself.



It deletes the following file:
   • %SYSDIR%\drivers\klif.sys



The following files are created:

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

%SYSDIR%\drivers\klif.sys Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: RKIT/OnlineGames.AP

%SYSDIR%\amvo0.dll Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: TR/Vundo.Gen




It tries to download a file:

– The location is the following:
   • http://djc**********.com/fm4/help.rar

 Registry The following registry key 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 in order to load the service after reboot:

– [HKLM\SYSTEM\ControlSet001\Services\KAVsys]
   • "Type"=dword:00000001
   • "ErrorControl"=dword:00000001
   • "Start"=dword:00000001
   • "ImagePath"="\??\%SYSDIR%\drivers\klif.sys"



The following registry keys are changed:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   Folder\Hidden\SHOWALL]
   New value:
   • "CheckedValue"=dword:00000000

– [HKEY_USERS\S-1-5-21-796845957-1645522239-725345543-1003\Software\
   Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "Hidden"=dword:00000002

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "Hidden"=dword:00000002

 Injection –  It injects the following file into a process: %SYSDIR%\amvo0.dll

    Process name:
   • explorer.exe



– It injects itself as a 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 the following runtime packers:
   • NsPack
   • UPX

Description inserted by Ana Maria Niculescu on Thursday, July 8, 2010
Description updated by Ana Maria Niculescu on Thursday, July 8, 2010

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