The Security Mentor

This one arrives in email with the subject "Re:", an empty message and an attachment. According to Symantec's report, the attachment can have several different file types. It sends itself to everyone in your address book, and four times a month it deletes everything it can.

The good news is that it's spreading slowly and hasn't gotten far. The other good news is that you're safe if you use common sense and don't open strange attachments.