4/12: Mytob-AS Worm Uses SMTP Engine
April 12, 2005

W32.Mytob.AS@mm is a mass-mailing worm that uses its own SMTP engine to send an email to addresses that it gathers from the compromised computer. The worm spreads through the network by exploiting vulnerabilities and opens a back door on the compromised computer.

Technical details can be found at Symantec page.