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Virus:TR/PWS.Ban.104044.A
Date discovered:16/04/2008
Type:Trojan
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:104.044 Bytes
MD5 checksum:c61e389572ee99a03d08c1f065c148e3
IVDF version:7.00.03.175 - Wednesday, April 16, 2008

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Sophos: Mal/EncPk-CE
   •  Panda: W32/Wow.SI
   •  Eset: Win32/PSW.OnLineGames.NLI
   •  Bitdefender: Trojan.PWS.OnlineGames.WGP


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%\amvo.exe
   • %drive%\h.cmd



It deletes the initially executed copy of itself.



It deletes the following files:
   • %SYSDIR%\wincab.sys
   • %TEMPDIR%\help.rar
   • %TEMPDIR%\g.sys



The following files are created:

%drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

%TEMPDIR%\g.sys Further investigation pointed out that this file is malware, too. Detected as: TR/PWS.Banke.104044

%TEMPDIR%\fhf.dll Further investigation pointed out that this file is malware, too. Detected as: TR/PWS.Ban.104044.C

%SYSDIR%\wincab.sys Further investigation pointed out that this file is malware, too. Detected as: TR/PWS.Banke.104044

%TEMPDIR%\help.rar
%SYSDIR%\amvo0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/PWS.Ban.104044.B




It tries to download a file:

– The location is the following:
   • http://www.om7890.com/mf2/**********




It tries to executes the following file:

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

 Registry One of the following values is added in order to run the process after reboot:

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "amva"="%SYSDIR%\amvo.exe"



The following registry key is added:

– [HKLM\SOFTWARE\Classes\CLSID\MADOWN]
   • "urlinfo"="tml><head><title>om7890.com</title></head><!-- Free revenue parking at www.dynadot.com. $9.25 registrations, transfers, renewals. --><frameset rows="50,*" border="0" framespacing="0" frameborder="0"><frame name="main" src="http://park.dynadot.com/rtop.html" marginwidth="0" marginheight="0" scrolling="auto" noresize="noresize"><frame name="main" src="http://searchportal.information.com/?o_id=64905&a_id=24674&adultfilter=off&popunder=off&exit=off&domainname=om7890.com" marginwidth="0" marginheight="0""



The following registry keys are changed:

Various Explorer settings:

– [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%\amvo0.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.

Descrição enviada por Petre Galan em quarta-feira, 7 de abril de 2010
Descrição atualizada por Petre Galan em quinta-feira, 8 de abril de 2010

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