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Virus:TR/Autoit.BL
Date discovered:24/01/2008
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:227.157 Bytes
MD5 checksum:f305c36f2902724c854b6b0Fe607c04c
IVDF version:7.00.02.37 - Thursday, January 24, 2008

 General Method of propagation:
   • Mapped network drives


Aliases:
   •  Mcafee: W32/Autorun.worm.bz
   •  Kaspersky: Worm.Win32.AutoIt.ag
   •  F-Secure: Worm:W32/AutoIt.L
   •  Sophos: W32/Autoit-H
   •  Grisoft: Worm/Autoit.BAS
   •  Bitdefender: Win32.Worm.Autoit.AJ


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


Right after execution the following information is displayed:


 Files It copies itself to the following locations:
   • %WINDIR%\%executed file%
   • %drive%\%executed file%



The following file is created:

%WINDIR%\pc-off.bat This is a non malicious text file with the following content:
   • @echo off
     shutdown -s -f -t 1

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

 Registry The following registry key is added:

– [HKCU\Software\BARRY]
   • (Default) = bar311_**********@yahoo.com



The following registry keys are changed:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   Old value:
   • Userinit = userinit.exe,
   New value:
   • Userinit = userinit.exe,virus.exe

– [HKCU\Software\Microsoft\Command Processor]
   New value:
   • autorun = %WINDIR%\pc-off.bat

Various Explorer settings:
– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   Old value:
   • HideFileExt = %user defined settings%
   • Hidden = %user defined settings%
   • ShowSuperHidden = %user defined settings%
   New value:
   • HideFileExt = 1
   • Hidden = 2
   • ShowSuperHidden = 0

Description inserted by Andrei Gherman on Friday, July 25, 2008
Description updated by Andrei Gherman on Friday, July 25, 2008

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