I recently was blessed with a user who was fooled by an email about a package and tracking.  The email of course had nothing to do with a shipping company, but contained Cryptowall, a variant of the Cryptodefender trojan.  And it was methodical.  After basically locking them out of all their databases for a day while it did its business, it popped up the obligatory message about all the files being encrypted with an RSA 2048 key, and if you did not give them $500 in bitcoins (that...