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.
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.
Files that are detected as Packed.Win32.Tibs.ab has similar functionality withEmail-Worm.Win32.Zhelatin variants. On execution, the following are the changes made to the system:
Creates these files:
Registry Modifications
Sets these values:
**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.