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Virus:TR/PSW.Frethog.118272H
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:118.272 Bytes
MD5 checksum:4216f1d160ecdcd9f81e03512686abfd

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Sophos: Mal/Generic-A
   •  Panda: W32/Lineage.LHM
   •  Eset: Win32/PSW.OnLineGames.NNU
   •  Bitdefender: Trojan.PWS.OnlineGames.KDDH


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:
   • %drive%\9fo3ar0j.exe
   • %TEMPDIR%\herss.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%\cvasds0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Agent.86528




It tries to download a file:

– The location is the following:
   • http://www.baidu2y4.com/1mg/**********

 Registry One of the following values is added in order to run the process after reboot:

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "cdoosoft"="C:\Temp\herss.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%\cvasds0.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 Tuesday, March 23, 2010

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