Be on the lookout for this new Phishing attack! The person emailing you purports to be an employee of the united parcel service (UPS), of course- these emails have nothing at all to do with UPS.
The email claims that your package was not able to be delivered, and includes a fake invoice that is to be downloaded and printed in order to pick up the package at a ups store. Once downloaded and opened, the payload (TRJ/Agent.JEN) installs itself. The virus copies itself and replaces several vital components of your system. Essentially, the virus fools your system into believing that the virus is a legit program.
This Virus connects to a russian and german domain, bad news if you get it installed.