Toyep is an Internet worm that spreads by e-mail through messages with infected attachments. Once executed, the parasite installs itself to the system and starts a spreading routine. It uses own mail engine to send malicious e-mails to addresses it gathers from local web, mail, program and text files. The worm also carries a payload. Toyep downloads from the Internet and installs other parasites, usually some trojans. It runs on every Windows startup.