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For those unaware, WannaCry is an insanely fast-spreading ransomware malware that leverages a Windows SMB exploit to target a computer running on unpatched or unsupported versions of Windows and servers and then spread itself like a worm to infect other vulnerable systems in the internal network.

The SMB vulnerability has been identified as EternalBlue, a collection of hacking tools allegedly created by the NSA and then subsequently dumped by a hacking group calling itself "The Shadow Brokers" over a month ago.

"If NSA had privately disclosed the flaw used to attack hospitals when they *found* it, not when they lost it, this may not have happened" NSA whistleblower Edward Snowden says.