Bofra

Bofra is a family of mass-mailing worms that are designed to exploit an unpatched vulnerability in Internet Explorer's IFRAME handling. Bofra differs from regular mass-mailing worms because it sends itself not in emails but it uses an HTTP link that points to the host that sent the infected email. In addition, Bofra has an IRC-controlled backdoor that allows the remote attacker to get full control over your computer and steal your sensitive information.