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Virus:Worm/AutoIt.va
Date discovered:04/01/2011
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:361.489 Bytes
MD5 checksum:9ef7d1bf2f868da08a26d08ac28e302e
VDF version:7.10.07.145
IVDF version:7.11.01.20 - Tuesday, January 4, 2011

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Sophos: Mal/Generic-A
   •  Bitdefender: Trojan.Autoit.ALR
   •  Panda: W32/Autorun.JTE
   •  Eset: Win32/Autoit.GO


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:
   • %WINDIR%\svchost.exe
   • %drive%\japan.exe
   • %WINDIR%\scvost.com



The following files are created:

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

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

 Registry The following registry key is added in order to run the process after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "SYS1"="%WINDIR%\scvost.com"
   • "SYS2"="%WINDIR%\svchost.exe"



The values of the following registry keys are removed:

–  [HKCU\Software\Microsoft\Internet Explorer\Main]
   • Window Title

–  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • Lao Antivirus
   • avgnt



The following registry key is added:

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



The following registry keys are changed:

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

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   New value:
   • "NoDriveTypeAutoRun"=dword:0x0000005b

 Process termination The following process is terminated:
   • taskmgr.exe


 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 Petre Galan on Tuesday, February 22, 2011
Description updated by Petre Galan on Tuesday, February 22, 2011

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