There’s usually a lot of hoax virus warnings going around, but since this one is actually posted on the UPS website, I’d say this one is probably pretty legit. So, if you get an email from UPS saying that your package could not be delivered, and comes with an attachment for an invoice, you should probably delete it.

Attention Virus Warning
Service Update

We have become aware there is a fraudulent email being sent that says it is coming from UPS and leads the reader to believe that a UPS shipment could not be delivered.  The reader is advised to open an attachment reportedly containing a waybill for the shipment to be picked up.

This email attachment contains a virus.  We recommend that you do not open the attachment, but delete the email immediately.

UPS may send official notification messages on occasion, but they rarely include attachments.  If you receive a notification message that includes an attachment and are in doubt about its authenticity, please contact customerservice@ups.com.

Please note that UPS takes its customer relationships very seriously, but cannot take responsibility for the unauthorized actions of third parties.

Thank you for your attention.