Vundo.gen.ab

This page shows details and results of our analysis on the malware Vundo.gen.ab

Overview

This is a Trojan detection. Unlike viruses, Trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include e-mail, malicious or hacked Web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.


Minimum Engine

5600.1067

File Length

varies

Description Added

2009-01-21

Description Modified

2009-02-21

Malware Proliferation

Characteristics

The following files have been added to the system:

    * %ALLUSERSPROFILE%\application data\[randomname].dll

The following registry elements have been created:

    * hkey_local_machine\software\classes\clsid\{8a4f1b44-1dd2-11b2-8127-88a46355a78b}\inprocserver32\
      t = 335996
      threadingmodel = apartment

The following registry elements have been changed:

    * hkey_local_machine\software\microsoft\windows\currentversion\run\
      [randomname]= regsvr32 /u "c:\documents and settings\all user\application data\[randomname].dll"

Symptoms

This symptoms of this detection are the files, registry, and network communication referenced in the characteristics section.

Method of Infection

Trojans do not self-replicate. They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, e-mail, etc.

Removal

All Users:
Use current engine and DAT files for detection and removal.

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).

But in some particular cases, the following steps need to be taken.

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.


On Windows Vista and 7:

  • Insert the Windows CD into the CD-ROM drive and restart the computer.
  • Click on "Repair Your Computer".
  • When the System Recovery Options dialog comes up, choose the Command Prompt.
  • Issue 'bootrec /fixmbr' command to restore the Master Boot Record.
  • Follow onscreen instructions.
  • Reset and remove the CD from CD-ROM drive.

Variants