We've written before about ransomware attacks back in February of 2016 and again in April of that year. In those cases, the attacks were relatively small and isolated to individual hospitals or healthcare networks. The recent "WannaCry" attack that began on Friday, May 12, however was massive and was reported to have infected more than 230,000 computers in over 150 countries. The attack was aimed at Windows operating systems, particularly older versions. For the uninitiated, ransomware is a malicious software virus that blocks access to the infected computer or network's data or threatens to publish or delete it until a ransom is paid, often in the untraceable cryptocurrency, Bitcoin.