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F-Secure Malware Information Pages: Packed:W32/Tibs.AB
[Summary] | [Detailed Description] | [Detection]

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

Summary
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.
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Detailed Description
Files that are detected as Packed.Win32.Tibs.ab have similar functionality to Email-Worm.Win32.Zhelatin variants.

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

File System Changes

Creates these files:
  • %windir%\system32\windev-[random_numbers].sys
  • %windir%\system32\windev-peers.ini

Registry Modifications

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

Note: %systemdir% is usually C:\Windows\system32.

Stealth Features

Hides these files:
  • %windir%\system32\windev-peers.ini
  • %windir%\system32\windev-[random_numbers].sys

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 good number of predefined IP addresses using UDP.

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

F-Secure Anti-Virus detects this malware with the following updates:

[FSAV_Database_Version]

Version = 2007-05-27_04.
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F-Secure Corporation

Last Modified: July 10, 2007