Packed:W32/Tibs.AB

Classification

Category :

Malware

Type :

Packed

Platform :

W32

Aliases :

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

Summary

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

Removal

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

Check for the latest database updates

First check if your F-Secure security program is using the latest updates, then try scanning the file again.
Submit a sample

After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
Exclude a file from further scanning

If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

Note: You need administrative rights to change the settings.

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

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

More Support

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