Threat Description

Packed:​W32/Tibs.AB

Details

Aliases:Packed:​W32/Tibs.AB, Packed.Win32.Tibs.ab
Category:Malware
Type:Packed
Platform:W32

Summary



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



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More

You may wish to refer to the Support Community for further assistance. You may also refer to General Removal Instructions for a general guide on alternative disinfection actions.



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 e-mail messages

Execution

On execution, the malware creates these files:

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

And then hides them.

Activity

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:

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

Rootkit

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






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