Threat description




Gibe.d worm first appeared in the end of March 2003. The worm spreads itself via e-mail, IRC, local network and P2P (peer-to-peer) networks. The worm pretends to be an update from Microsoft when it spreads via e-mail.


Automatic action

Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.

More scanning & removal options

More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.

Technical Details

The file that spreads via e-mails is a dropper. It is a 167-kilobyte file written in Visual Basic. It is a dropper that contains a few compressed files in its body.

Technically the .D variant is not much different from .B variant of the worm. You can find the description of .B variant here:

There are a few differences comparing to earlier versions:

1. The dropper now uses randomly generated key name to hold its settings:

 \Internet Settings\[random_name]]

2. The dropper has an extended list of names that it uses to drop itself to Kazaa shared folders:

KaZaA upload
XboX Emulator
PS2 Emulator
XP update
XXX Video
Sick Joke
Free XXX Pictures
My naked sister
Hallucinogenic Screensaver
Cooking with Cannabis
Magic Mushrooms Growing
Worm_Gibe.C Cleaner
ICQ upgrade
KaZaA spyware patch
Download Accelerator
Hackers Guide

3. The dropper copies itself as xx.DLL (where 'xx' are random characters) to Windows folder on a local computer. It also copies itself to Windows folder with a randomly generated name, for example UPDATE263.EXE.

4. The dropper creates the main worm component with a random name (for example FEBKI.EXE) in Windows folder and changes EXE, BAT, COM, PIF, REG, SCR files startup key to load that file every time a user runs files with those extensions. Also the dropper creates a startup key for this file in the Registry:

"random_name" = "%windir%\[random_name] 

5. The worm extracts the list of SMTP servers into SWEN.LST file.

6. The worm collects e-mail addresses and writes them to FLOTSAM.BAK file.

7. The worm disables Registry editing tools.

8. The worm terminates and doesn't allow to run programs that contain the following strings in their names:

VirusScan (McAfee)

Detection for Gibe.d was added in the folowing updates:

Detection Type: PC

Database: 2003-03-24_03

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