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Virus:TR/PSW.Magania.crby
Date discovered:31/12/2009
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:103.936 Bytes
MD5 checksum:c7998d73d015d74886242a6d04bb6bfd
IVDF version:7.10.02.108 - Thursday, December 31, 2009

 General Method of propagation:
    Autorun feature


Aliases:
   •  Panda: W32/Lineage.LGW
   •  Eset: Win32/PSW.OnLineGames.NNU
   •  Bitdefender: Worm.Generic.219662


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:
   • %TEMPDIR%\herss.exe
   • %drive%\3exi.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%

%TEMPDIR%\cvasds0.dll Further investigation pointed out that this file is malware, too. Detected as: Worm/Agent.81920.6




It tries to download a file:

The location is the following:
   • http://www.yahoox5f.com/1mg/**********




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]
   • "cdoosoft"="%TEMPDIR%\herss.exe"



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: %TEMPDIR%\cvasds0.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, 31 de março de 2010
Descrição atualizada por Petre Galan em quarta-feira, 31 de março de 2010

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