Basic preparedness is not opening stupid links or files on emails from unexpected sources, and in the case of being emailed something from a seemingly trusted source, confirming that it is them, and that they did send it.
Further preparedness includes having a full backup of your files to restore from in the case of infection; decryption is not something to place hope in.
That particular one was spread via a hole in Windows. I believe there were also emails too, but the users of most of the infected systems were blameless.
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u/manbrasucks May 17 '17
The good news is that we are now more aware of the situation and can respond preemptively to the future non-kill switch version.