Full description

Virus:	Worm/Autorun.bhdd
Date discovered:	11/05/2010
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:	112.640 Bytes
MD5 checksum:	c979421c6bc110c2ed10bd1d08a88dc3
IVDF version:	7.10.07.90 - Tuesday, May 11, 2010

General Method of propagation:
   • Autorun feature

Aliases:
   • Sophos: W32/Taterf-O
   • Bitdefender: Trojan.PWS.Onlinegames.KDHO
   • Panda: W32/Lineage.LLR
   • Eset: Win32/PSW.OnLineGames.OUM

Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003

Side effects:
   • Downloads malicious files
   • Drops malicious files
   • Registry modification

Files It copies itself to the following locations:
   • %TEMPDIR%\nodqq.exe
   • %drive%\qhbfqx.exe

It deletes the initially executed copy of itself.

It deletes the following files:
   • %TEMPDIR%\nodqq0.dll
   • %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%\am.exe
– %temporary internet files%\am1[1].rar
– %TEMPDIR%\dsoqq.exe
– %TEMPDIR%\nodqq0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Magania.dfnh

– %temporary internet files%\am[1].rar
– %TEMPDIR%\dsoqq0.dll
– %TEMPDIR%\am1.rar

It tries to download some files:

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

– The location is the following:
   • http://www.googlewdx.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]
   • "dso32"="%TEMPDIR%\dsoqq.exe"
   • "nod32"="%TEMPDIR%\nodqq.exe"

The following registry key is added:

– [HKLM\SOFTWARE\Classes\CLSID\MADOWN]
   • "urlinfo"="dswwbmh.h"

Injection – It injects the following file into a process: %TEMPDIR%\nodqq0.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: %TEMPDIR%\dsoqq0.dll

    Process name:
   • explorer.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 donderdag 19 augustus 2010
Description updated by Petre Galan on donderdag 19 augustus 2010

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