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Virus:Worm/Autorun.bfxo
Date discovered:20/04/2010
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:189440 Bytes
MD5 checksum:cca61fb21b8060e97cea68b4a8c0e26b
VDF version:7.10.02.175
IVDF version:7.10.06.143 - Tuesday, April 20, 2010

 General Method of propagation:
    Autorun feature


Aliases:
   •  Kaspersky: Worm.Win32.AutoRun.bfxo
   •  TrendMicro: Mal_Run-8
   •  F-Secure: Worm.Win32.AutoRun.bfxo
   •  Sophos: Mal/Taterf-B
   •  Bitdefender: Trojan.Onlinegames.832
   •  Grisoft: Win32/NSAnti.J
     DrWeb: Trojan.PWS.Wsgame.13163


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:
   • %SYSDIR%\cyban.exe
   • %drive%\abqj61fm.exe



It deletes the initially executed copy of itself.



It deletes the following files:
   • %TEMPDIR%\ah.exe
   • %TEMPDIR%\ah1.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%\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.dcad

%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.dbzu

%TEMPDIR%\ah1.rar
%TEMPDIR%\ah.exe Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Magania.dbzu




It tries to download some files:

The location is the following:
   • http://www.googlecbm.com/1hg/**********


The location is the following:
   • http://www.googled3r.com/1hg/**********




It tries to execute the following files:

Filename:
   • %PROGRAM FILES%\Internet Explorer\iexplore.exe


Filename:
   • %TEMPDIR%\ah.exe


Filename:
   • %SYSDIR%\regsvr32
using the following command line arguments: /s %SYSDIR%\ieban0.dll


Filename:
   • %SYSDIR%\regsvr32
using the following command line arguments: /s %SYSDIR%\cyban0.dll

 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"



The following registry key is added:

[HKLM\SOFTWARE\Classes\CLSID\MNDOWN\urlinfo]
   • "chedfr.e"



The following registry keys are changed:

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   Folder\Hidden\SHOWALL]
   Old value:
   • "CheckedValue"=dword:00000001
   New value:
   • "CheckedValue"=dword:00000000

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   Old value:
   • "Hidden"=dword:00000001
   New value:
   • "Hidden"=dword:00000002

 Injection It injects itself as a remote thread into a process.

    Process name:
   • iexplore.exe



–  It injects the following file into a process: %SYSDIR%\ieban0.dll

    Process name:
   • explorer.exe



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

    Process name:
   • explorer.exe


 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
   • ASPack

説明の挿入者 Ana Maria Niculescu の 2010年9月20日月曜日
説明の更新者 Ana Maria Niculescu の 2010年9月29日水曜日

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