Starting the end of last week, computer systems in over 70 countries across the globe were hit by virulent strain of malware going by the names Wanna Decryptor, Wcry, or Wanna Cry. Included in innumerable victims of this attack were many systems at the British National Health Service. The malware spread quickly through affected networks, encrypting all personal data and demanding a ransom in bitcoin equivalent to $300 per affected system.