Name :	Packed.Win32.Tibs.ab
Category:	Malware
Type:	Email-Worm
Platform:	W32
Date of Discovery:	July 07, 2007

Packed.Win32.Tibs.ab has rootkit functionality and it mass mails itself. This malware uses peer to peer networks (P2P) to spread. It also has the same functionality with Worm Zhelatin variants.

Files that are detected as Packed.Win32.Tibs.ab has similar functionality with Email-Worm.Win32.Zhelatin variants.

On execution, the following are the changes made to the system:

File System Changes

Creates these files:


Registry Modifications

Sets these values:

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

**NOTE: Usually %systemdir% is C:\Windows\system32

Stealth Features

Hides these files:


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

[config]
[local]
[peers]
61CBE5C404F4C715C809A8588F42950C=9A2542751EBF00
61CBE5C4CB3D735B77590054E92865F3=9A2542BB1EBF00
8024083AF066B98A86BF0B0BF1135EF7=55198859159800
80A32744A44A3359F3F4B39D19E8E32B=53258C841C4400

Another noticeable characteristic for this malware is that it tries to connect to a lot of predefined IP addresses using UDP.

Furthermore, the files that are detected as Packed.Win32.Tibs.ab are usually downloaded from clicking links from heavily spammed emails such as those that we detect as HTML/Postcards.N@troj.