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Virus:Worm/Autorun.glt
Date discovered:10/08/2010
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:107.357 Bytes
MD5 checksum:9de18645ffbb9deea0a855312b5d213a
IVDF version:7.01.05.89 - Monday, August 10, 2009

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Bitdefender: Trojan.PWS.OnlineGames.KCSG
   •  Eset: Win32/PSW.OnLineGames.NNU


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


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

 Files It copies itself to the following locations:
   • %drive%\ktly.exe
   • %TEMPDIR%\herss.exe



It deletes the initially executed copy of itself.



It deletes the following files:
   • %SYSDIR%\drivers\cdaudio.sys
   • %TEMPDIR%\am1.rar



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: TR/Crypt.ZPACK.Gen

%TEMPDIR%\am1.rar



It tries to download a file:

– The location is the following:
   • http://gir88e.net/1mg/**********




It tries to execute the following file:

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



The following registry key is added:

– [HKLM\SOFTWARE\Classes\CLSID\MADOWN]
   • "urlinfo"="%character string%"



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 Programming language:
The malware program was written in MS Visual C++.


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 sexta-feira, 12 de novembro de 2010
Descrição atualizada por Andrei Ivanes em sexta-feira, 19 de novembro de 2010

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