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Date discovered:12/10/2009
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:116.526 Bytes
MD5 checksum:918519de3fa6c7d2213b6d81b551b111
IVDF version: - Monday, October 12, 2009

 General Method of propagation:
   • Autorun feature

   •  Panda: W32/Lineage.LKR
   •  Eset: Win32/PSW.OnLineGames.NNU
   •  Bitdefender: Trojan.Generic.3131594

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:
   • %drive%\vlvtdflx.exe
   • %TEMPDIR%\herss.exe

It deletes the initially executed copy of itself.

It deletes the following files:
   • %TEMPDIR%\cvasds0.dll
   • %drive%\i8ikdjwt.exe
   • %TEMPDIR%\am.exe
   • %TEMPDIR%\am1.rar

The following files are created:

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

%TEMPDIR%\cvasds0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.ZPACK.Gen


It tries to download some files:

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

– The location is the following:
   • http://www.yahoogf2.com/1mg/**********

It tries to executes the following files:

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

– Filename:
   • "%TEMPDIR%\am.exe"

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

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

The following registry key is added:

   • "urlinfo"="%character string%"

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

 Injection –  It injects the following file into a process: %TEMPDIR%\cvasds0.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.

Die Beschreibung wurde erstellt von Petre Galan am Freitag, 7. Mai 2010
Die Beschreibung wurde geändert von Petre Galan am Freitag, 7. Mai 2010

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