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Virus:VBS/Autorun.l2
Date discovered:23/01/2008
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Low
Static file:Yes
File size:6.053 Bytes
MD5 checksum:153e90f0ca2a0de93da62e6789c91f22
IVDF version:7.00.02.35 - Wednesday, January 23, 2008

 General Method of propagation:
    Autorun feature


Aliases:
   •  Mcafee: VBS/Autorun.worm.au
   •  Sophos: W32/Autorun-AWJ
   •  Panda: VBS/Autorun.EB
   •  Eset: VBS/AutoRun.L
   •  Bitdefender: Trojan.VBS.Autorun.ACS


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


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

 Files It copies itself to the following location:
   • %drive%\UserConfig.vbs



It deletes the following files:
   • %TEMPDIR%\username.bat
   • %TEMPDIR%\username.txt
   • %SYSDIR%\username.txt
   • %TEMPDIR%\TempCmd.cmd
   • %TEMPDIR%\TempReg.reg



The following files are created:

%TEMPDIR%\TempReg.reg This is a non malicious text file with the following content:
   • %code that runs malware%

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

%TEMPDIR%\username.txt
%TEMPDIR%\username.bat Furthermore it gets executed after it was fully created.
%TEMPDIR%\TempCmd.cmd Furthermore it gets executed after it was fully created.



It tries to executes the following files:

Filename:
   • cmd /c ""C:\Temp\TempCmd.cmd" "


Filename:
   • regedit /s C:\Temp\TempReg.reg


Filename:
   • cmd /c ""C:\Temp\username.bat" "

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

  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "RunUserConfig"="%TEMPDIR%\UserConfig.vbs"



The following registry key is changed:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "ShowSuperHidden"=dword:0x00000000

說明撰寫者 Petre Galan 開啟 2010年4月1日星期四
說明更新者 Petre Galan 開啟 2010年4月1日星期四

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