Tanatos (also known as Bugbear) is an email and network worm that also has a backdoor component. This particular variant is similar to the original Tanatos/Bugbear worm that was found in year 2002.
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.
This Tanatos worm variant spreads in email messages with the following characteristics:
Date Created: 2006-04-12 18:04:00.0
Date Last Modified: 2006-05-11 12:16:23.0