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-wid…
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