I just thought I would address this since I have had two customers struck by ransomware.  First off, please don’t click on anything from UPS or FedEx unless you are sure that they are real.  Second, here is a document from a company that I have used for over 10 years for anti-virus and anti-malware.  It addresses ransomware and gives you some good help on how to protect yourself and your business.  Although nothing is full proof, this piece of software does help immensely and provides anti-virus, anti-malware, browser filtering, firewall and many other features.

F-Secure Protection Service for Business

Here is some more info on their web site.  As always, call me if you need any help.  Mike