W32/Virut.g

On execution, the virus looks to inject itself into running processes and hooks the following ntdll.dll APIs:

• NtCreateFile
• NtCreateProcess
• NtCreateProcessEx
• NtOpenFile

It infects executables by appending its body inside the last section and modifying the entry point to itself.

W32/Virut.g opens up a backdoor on the compromised machine at port 80 (typically used for HTTP) but uses it for IRC communication.

This virus tries to connect to IRC server located at :

• proxim.ntkrnlpa.info

And joins the following channel:

• virtu3

It can then receive commands to download and execute other malware from various hosts on the infected machine.

• Modified executable files (increase in the size of exe files)
• DNS queries to proxim.ntkrnlpa.info and IRC related network traffic

W32/Virut.g is a file infecting virus. Infection starts with manual execution of the binary. Executables in network shares may also get infected if accessed by the compromised machine.

All Users:

Please use the following instructions for all supported versions of Windows to remove threats and other potential risks:

1.Disable System Restore .

2.Update to current engine and DAT files for detection and removal.

3.Run a complete system scan.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

1. Please go to the Microsoft Recovery Console and restore a clean MBR.

On windows XP:

Insert the Windows XP CD into the CD-ROM drive and restart the computer.
When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
Select the Windows installation that is compromised and provide the administrator password
Issue 'fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.