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Date discovered:11/12/2009
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:116.812 Bytes
MD5 checksum:f1bae35d296930d2076b9d84ba0c95ea
IVDF version: - Friday, December 11, 2009

 General Method of propagation:
    Autorun feature

   •  Sophos: Mal/Taterf-B
   •  Panda: W32/Lineage.KFS
   •  Eset: Win32/PSW.OnLineGames.NNU
   •  Bitdefender: Trojan.Generic.3002857

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%\olhrwef.exe
   • %drive%\yudald.bat

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%

%SYSDIR%\nmdfgds0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.ZPACK.Gen

It tries to download a file:

The location is the following:

It tries to executes the following file:

   • "%PROGRAM FILES%\Internet Explorer\IEXPLORE.EXE"

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

   • "cdoosoft"="%SYSDIR%\olhrwef.exe"

The following registry keys are changed:

   New value:
   • "Hidden"=dword:0x00000002
   • "ShowSuperHidden"=dword:0x00000000

   New value:
   • "NoDriveTypeAutoRun"=dword:0x00000091

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

 Injection –  It injects the following file into a process: %SYSDIR%\nmdfgds0.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.

Açıklamayı yerleştiren Petre Galan tarihinde 10 Haziran 2010 Perşembe
Açıklamayı güncelleyen: Petre Galan tarihinde 10 Haziran 2010 Perşembe

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