Virus:WORM/Autorun.bfxr
Date discovered:27/04/2010
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:188.416 Bytes
MD5 checksum:89ba009b7619c36947602708f4af93db
VDF version:7.10.02.209
IVDF version:7.10.06.225 - Tuesday, April 27, 2010

 General Methods of propagation:
   • Autorun feature
   • Mapped network drives


Aliases:
   •  Symantec: W32.Gammima.AG
   •  Kaspersky: Worm.Win32.AutoRun.bfxr
   •  TrendMicro: Mal_Run-8
   •  Sophos: Mal/Taterf-B
   •  Microsoft: Worm:Win32/Taterf.DL
   •  AVG: Win32/NSAnti.J
   •  Panda: W32/Lineage.LMP
   •  PCTools: Malware.Gammima
   •  Eset: Win32/PSW.OnLineGames.PLU
   •  DrWeb: Trojan.PWS.Wsgame.13163
   •  Ikarus: Worm.Win32.AutoRun


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


Side effects:
   • Lowers security settings
   • Downloads malicious files
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following locations:
   • %SYSDIR%\cyban.exe
   • %drive%\abqj61fm.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%

– %SYSDIR%\ieban0.dll Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Magania.dcar

– %SYSDIR%\cyban0.dll Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Magania.dbzw

– %SYSDIR%\nodabc.exe Further investigation pointed out that this file is malware, too.
– %SYSDIR%\nodabc0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.ASPM.Gen

– %SYSDIR%\nodie0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.ASPM.Gen




It tries to download some files:

– The location is the following:
   • http://www.googlecbm.com/1**********
It is saved on the local hard drive under: %TEMPDIR%\ah1.rar

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

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

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "cybansos"="%SYSDIR%\cyban.exe"
   • "odsos"="%SYSDIR%\nodabc.exe"



The following registry keys are added:

– [HKLM\SOFTWARE\Classes\TypeLib\
   {7F235922-8F2C-4C08-83A8-BBE01BF9CC64}\1.0\0\win32]
   • "@"="%SYSDIR%\ieban0.dll"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {5DA7432B-6725-4ADE-BF17-C328743011FD}\1.0\0\win32]
   • "@"="%SYSDIR%\nodie0.dll"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\
   Browser Helper Objects\{7F23592B-8F2C-4C08-83A8-BBE01BF9CC64}]
– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\
   Browser Helper Objects\{5DA743EA-6725-4ADE-BF17-C328743011FD}]
– [HKLM\SYSTEM\ControlSet001\Services\kmixer\Enum\0]
   • "@"="\"SW\{b7eafdc0-a680-11d0-96d8-00aa0051e51d}\{9B365890-165F-11D0-A195-0020AFD156E4}"

– [HKLM\SYSTEM\CurrentControlSet\Services\kmixer\Enum\0]
   • "@"="SW\{b7eafdc0-a680-11d0-96d8-00aa0051e51d}\{9B365890-165F-11D0-A195-0020AFD156E4}"



The following registry keys are changed:

Various Explorer settings:

– [HKU\S-1-5-21-2052111302-1336601894-725345543-1003\Software\
   Microsoft\Windows\CurrentVersion\Explorer\Advanced\]
   Old value:
   • "ShowSuperHidden"=dword:00000001
   New value:
   • "ShowSuperHidden"=dword:00000000

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   Folder\Hidden\SHOWALL]
   Old value:
   • "Hdden"=dword:000000001
   New value:
   • "Hdden"=dword:000000002

 Injection –  It injects the following file into a process: %SYSDIR%\cyban0.dll

    Process name:
   • explorer.exe



– It injects itself into a process.

    Process name:
   • iexplore.exe



–  It injects the following file into a process: %SYSDIR%\nodabc0.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 Alexandru Dinu on Wednesday, August 18, 2010
Description updated by Alexandru Dinu on Monday, August 23, 2010

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