Remove VBS.Mutafrog!inf

Posted on: June 18th, 2009


Discovered: June 15, 2009
Updated:

June 15, 2009 8:17:29 AM

Type:

Virus

Systems Affected:

Windows XP, Windows Vista, Windows Server 2003, Windows 2000

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Technical Details:
When executed, the virus creates one of the following files:

* %Windir%\MsSvrdll.vbs

* %System%\MsSvrdll.vbs

Note: The above files are detected as Bloodhound.VBS.4.

It then creates one of the following registry entries so that the dropped file

executes whenever Windows starts:

* HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Current

Version\RunOnce\”a” = “%Windir%\MsSvrdll.vbs”

* HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Current

Version\RunOnce\”a” = “%System%\MsSvrdll.vbs”

It then executes the following files, if present:

* %System%\svch0st.exe

* %Windir%\system\dllhost.com

The virus then creates the following file on fixed and removable drives,

which is also detected as Bloodhound.VBS.4:

%DriveLetter%\READ ME.TXT.vbs

It also searches fixed and removable drives for files with the following

extensions, which it then infects:

* .asp

* .html

* .htm

* .php

Action Steps:
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