This is the latest to come down the pike. Be very careful. Never open attachments unless you have verified by phone that it's been sent. Viruses can use your address book to send out and it would seem like the virus came from someone you knew. This one not only installs itself without your interaction or knowledge, it also downloads W32.Sykel and Backdoor.Nemog.C. Just be careful and update your antivirus program. It's your best defense.