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Date discovered:16/01/2008
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:215.081 Bytes
MD5 checksum:b7a7e7c7f6ba1f89fbdda06e0701ae7c
IVDF version:

 General Method of propagation:
   • Autorun feature

   •  Mcafee: W32/Autorun.worm.h
   •  Sophos: W32/Autoit-F
   •  Panda: W32/Autorun.JRZ.worm
   •  Eset: Win32/Autoit.AX
   •  Bitdefender: Worm.Generic.77741

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 locations:
   • %drive%\msmsgs.exe
   • %SYSDIR%\Microsoft\msmsgs.exe

The following file is created:

%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:

The following registry keys are changed:

Deactivate Windows Firewall:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\system]
   New value:
   • "DisableRegistryTools"=dword:0x00000001
   • "DisableTaskMgr"=dword:0x00000001

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   New value:
   • "Userinit"="%SYSDIR%\userinit.exe,%SYSDIR%\Microsoft\Msmsgs.exe"

Various Explorer settings:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "Hidden"=dword:0x00000002
   • "HideFileExt"=dword:0x00000001
   • "ShowSuperHidden"=dword:0x00000000
   • "SuperHidden"=dword:0x00000000

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   New value:
   • "NoFind"=dword:0x00000001
   • "NoFolderOptions"=dword:0x00000001

 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Andrei Ivanes on Thursday, April 1, 2010
Description updated by Andrei Ivanes on Thursday, April 1, 2010

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