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Virus:Worm/Autorun.bfpw
Date discovered:04/01/2011
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:116.224 Bytes
MD5 checksum:7ba97193469fea583526db274779f06d
VDF version:7.10.07.145
IVDF version:7.11.01.20 - Tuesday, January 4, 2011

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Sophos: W32/AutoRun-BJS
   •  Bitdefender: Trojan.PWS.Onlinegames.KDFV
   •  Panda: W32/Lineage.KDB
   •  Eset: Win32/AutoRun.PSW.OnlineGames.AZ


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%\pbyqfn.exe
   • %TEMPDIR%\herss.exe



It deletes the initially executed copy of itself.



It deletes the following files:
   • %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%

%SYSDIR%\arking0.dll
%TEMPDIR%\cvasds0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Magania.dbhc

%SYSDIR%\arking.exe



It tries to download some files:

– The location is the following:
   • http://www.sohujui.com/1mg/**********
It is saved on the local hard drive under: %TEMPDIR%\am.exe

– The location is the following:
   • http://www.sohujui.com/1mg/**********
It is saved on the local hard drive under: %TEMPDIR%\am1.rar



It tries to execute 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]
   • "King_ar"="%SYSDIR%\arking.exe"
   • "cdoosoft"="%TEMPDIR%\herss.exe"



The following registry key is added:

– [HKLM\SOFTWARE\Classes\CLSID\MADOWN]
   • "urlinfo"="dfgtyi.x"



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 remote thread into a process.

    Process name:
   • iexplore.exe



–  It injects the following file into a process: %SYSDIR%\arking0.dll

    Process name:
   • explorer.exe


 Miscellaneous Accesses internet resources:
   • http://www.yahooui0.com/1mg/**********

 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, January 25, 2011
Description updated by Petre Galan on Tuesday, January 25, 2011

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