Remove W32.Ramnit

Posted on: January 27th, 2010

Discovered: January 19, 2010
Updated: January 20, 2010 12:08:42 AM
Type: Virus
Systems Affected: Windows 98, Windows 95, Windows XP, Windows Me, Windows Vista, Windows NT, Windows Server 2003, Windows 2000
Recommended Action:
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Technical Details:
Once executed, the worm creates the following folder:

%ProgramFiles%\MNetwork

It then creates the following mutex so only one instance of the worm is running:

Ghiyhjmnklowqq

The worm spreads by encrypting and then appending itself to files with the following extensions:

* DLL

* EXE

* HTM

When an infected file, detected as W32.Ramnit!inf, is executed, it drops a copy of the worm executable file with the following file name and executes it:

%CurrentFolder%\[INFECTED FILE NAME]Srv.exe

The worm also spreads by copying itself to the recycle bin on the removable drive and creates the following file so that it executes whenever the drive is accessed:

%DriveLetter%\autorun.ini

The worm attempts to connect to the following remote location:

rmnzerobased.com

It attempts to download a .dll file and register it.

Note: At the time of writing, the file was unavailable.

Action Steps:
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