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Virus:Worm/Autorun.bfne
Date discovered:31/03/2010
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:171.520 Bytes
MD5 checksum:589c1566ba44d03fd6d7e5592032e3ed
IVDF version:7.10.06.10 - Wednesday, March 31, 2010

 General Method of propagation:
    Autorun feature


Aliases:
   •  Sophos: Mal/EncPk-OJ
   •  Panda: Trj/WL.A
   •  Eset: Win32/PSW.OnLineGames.OUM
   •  Bitdefender: Trojan.PWS.OnLineGames.KDHZ


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:
   • %SYSDIR%\cyban.exe
   • %drive%\yvarv6o8.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 Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Magania.dawo

%SYSDIR%\cyban0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Magania.dawn




It tries to download a file:

The location is the following:
   • http://www.googlew65.com/1hg/**********




It tries to executes the following files:

Filename:
   • %SYSDIR%\regsvr32.exe /s %SYSDIR%\ieban0.dll


Filename:
   • "%PROGRAM FILES%\Internet Explorer\IEXPLORE.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"



The following registry keys are added:

[HKLM\SOFTWARE\Classes\IEHlprObj.IEHlprObj]
   • "@"="IEHlprObj Class"

[HKLM\SOFTWARE\Classes\IEHlprObj.IEHlprObj.1]
   • "@"="IEHlprObj Class"

[HKLM\SOFTWARE\Classes\CLSID\{7F23592B-8F2C-4C08-83A8-BBE01BF9CC64}\
   InprocServer32]
   • "@"="%SYSDIR%\ieban0.dll"
   • "ThreadingModel"="Apartment"

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

[HKLM\SOFTWARE\Classes\IEHlprObj.IEHlprObj\CurVer]
   • "@"="IEHlprObj.IEHlprObj.1"

[HKLM\SOFTWARE\Classes\TypeLib\
   {7F235922-8F2C-4C08-83A8-BBE01BF9CC64}\1.0\FLAGS]
   • "@"="0"

[HKLM\SOFTWARE\Classes\TypeLib\
   {7F235922-8F2C-4C08-83A8-BBE01BF9CC64}\1.0]
   • "@"="IEHelper 1.0 Type Library"

[HKLM\SOFTWARE\Classes\CLSID\
   {7F23592B-8F2C-4C08-83A8-BBE01BF9CC64}]
   • "@"="IEHlprObj Class"

[HKLM\SOFTWARE\Classes\Interface\
   {7F23592C-8F2C-4C08-83A8-BBE01BF9CC64}\ProxyStubClsid32]
   • "@"="{00020424-0000-0000-C000-000000000046}"

[HKLM\SOFTWARE\Classes\Interface\
   {7F23592C-8F2C-4C08-83A8-BBE01BF9CC64}\ProxyStubClsid]
   • "@"="{00020424-0000-0000-C000-000000000046}"

[HKLM\SOFTWARE\Classes\TypeLib\
   {7F235922-8F2C-4C08-83A8-BBE01BF9CC64}\1.0\HELPDIR]
   • "@"="%SYSDIR%\"

[HKLM\SOFTWARE\Classes\IEHlprObj.IEHlprObj.1\CLSID]
   • "@"="{7F23592B-8F2C-4C08-83A8-BBE01BF9CC64}"

[HKLM\SOFTWARE\Classes\Interface\
   {7F23592C-8F2C-4C08-83A8-BBE01BF9CC64}\TypeLib]
   • "@"="{7F235922-8F2C-4C08-83A8-BBE01BF9CC64}"
   • "Version"="1.0"

[HKLM\SOFTWARE\Classes\CLSID\{7F23592B-8F2C-4C08-83A8-BBE01BF9CC64}\
   VersionIndependentProgID]
   • "@"="IEHlprObj.IEHlprObj"

[HKLM\SOFTWARE\Classes\Interface\
   {7F23592C-8F2C-4C08-83A8-BBE01BF9CC64}]
   • "@"="IIEHlprObj"

[HKLM\SOFTWARE\Classes\CLSID\{7F23592B-8F2C-4C08-83A8-BBE01BF9CC64}\
   ProgID]
   • "@"="IEHlprObj.IEHlprObj.1"



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: %SYSDIR%\cyban0.dll

    Process name:
   • explorer.exe



It injects itself as a remote 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, July 6, 2010
Description updated by Petre Galan on Tuesday, July 6, 2010

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