Better get patching

from here

When it comes to malware, there's almost never just one of anything. Maybe we'll be lucky and the people responsible for WannaCry won't bother fixing the flaws that the first had, but I wouldn't bet on it.

If you didn't get hit before, make sure it doesn't happen the next time. If you did get hit before, make sure it doesn't happen again. Patch if you can, block those damn ports, and make sure you've got backups.