This virus circulating is the UPS/Fed Ex/USPS Delivery Failure.
You will receive an e-mail from UPS, Fed Ex, or USPS along with a packet number.
It will say that they were unable to deliver a package sent to you on such-and-such a date.
It then asks you to print out the invoice copy attached.
DON'T TRY TO PRINT THIS. IT LAUNCHES THE VIRUS!
Snopes confirms that it is real.
If you're expecting a package and don't get it in a timely manner, call UPS, FED-EX or the Post