If you're interested in reading more about the current Windows worm/ransomware, these two sites have brief articles explaining what's up.
http://blog.talosintelligence.com/2017/05/wannacry.html
https://securelist.com/blog/incidents/78351/wannacry-ransomware-used-in-wide...
Note that they recommend blocking ports 139 and 445 to help prevent the spread of the worm infection. Amprgw has been blocking those ports for quite some time, but that doesn't prevent the infection from spreading within a group of computers or an organization. It is strongly suggested that people running Windows should be sure that all issued patches have been applied.
As usual, systems running non-Windows OS's (Linux, etc) are immune to this attack. - Brian