Home > Threat descriptions >



Category: Malware

Type: Packed

Aliases: Packed:W32/Tibs.AB, Packed.Win32.Tibs.ab


This program is packed using a packer program associated with numerous other malware.


Automatic action

Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.

Knowledge Base

Find the latest advice in our Community Knowledge Base.

About the product

See the manual for your F-Secure product on the Help Center.

Contact Support

Chat with or call an expert for help.

Submit a sample

Submit a file or URL for further analysis.

Technical Details

Packed:W32/Tibs.AB identifies packed files with similar functionality to Email-Worm:W32/Zhelatin. Tibs.AB files are usually downloaded by clicking malicious links in heavily spammed email messages


On execution, the malware creates these files:

  • %windir%\system32\windev-[random_numbers].sys
  • %windir%\system32\windev-peers.ini

And then hides them.


A noticeable characteristic for this malware is that it tries to connect to a lot of predefined IP addresses using UDP. A text file is also dropped which contains a possible lists of clients for the worm's peer-to-peer network. The details for the peer names and access ports are encoded. Example of the text file:


The installed component has rootkit functionality that can enable its process to be hidden from unsuspecting users.

Registry Modifications

The malware sets these values:

  • HKLM\System\CurrentControlSet\Services\windev-[random_numbers] ImagePath = %systemdir%\windev-[random_numbers].sys

Note: Usually %systemdir% is C:\Windows\system32