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Date discovered:15/12/2008
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:104.366 Bytes
MD5 checksum:c20d1ee17c01e460d8d97d03a5d3b85b
IVDF version: - Monday, December 15, 2008

 General Method of propagation:
   • Autorun feature

   •  Mcafee: Generic PWS.ak
   •  Panda: W32/Lineage.KEU
   •  Eset: Win32/PSW.OnLineGames.NMY
   •  Bitdefender: Packer.Malware.NSAnti.1

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:
   • %SYSDIR%\ckvo.exe
   • %drive%\

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%\ckvo0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Vundo.Gen

%SYSDIR%\drivers\klif.sys Further investigation pointed out that this file is malware, too. Detected as: TR/Magania.owv.sys

It tries to download a file:

– The location is the following:

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]
   • "kamsoft"="%SYSDIR%\ckvo.exe"

The following registry key is added:

– [HKLM\System\CurrentControlSet\Services\KAVsys]
   • "ErrorControl"=dword:0x00000001
   • "ImagePath"="\??\%SYSDIR%\drivers\klif.sys"
   • "Start"=dword:0x00000001
   • "Type"=dword:0x00000001

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\
   New value:
   • "CheckedValue"=dword:0x00000000

 Injection –  It injects the following file into a process: %SYSDIR%\ckvo0.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 a runtime packer.

Description inserted by Petre Galan on Tuesday, March 23, 2010
Description updated by Petre Galan on Thursday, March 25, 2010

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