I-Worm.Badtrans

This is an Internet worm that spreads by e-mail in infected attachments. When it infects a PC, it starts its processes and places files on a hard disk. Then it scans incoming mail for some attributes and replies to it, sometimes causing huge overload of the local area network's traffic and local mail server. It also has an integrated trojan, which can be used by an attacker to get into your computer.