Worm.Frethem.n

Worm.Frethem.n is a worm that arrives as an infected email attachment. Worm.Frethem.n uses a MIME header vulnerability and an IFRAME vulnerability so that the attached file is run automatically when the email is viewed on unpatched Microsoft email clients. Worm.Frethem.n may also cause denial-of-service conditions in networks where multiple systems are infected, or large volumes of infected mail are received.