Friday 12th May 2017, hackers carried out the biggest cyberattack ever. It reached hundreds of thousands of computers in over 150 countries. Allegedly stolen from the National Security Agency, malware called WannaCry was emailed and affects Microsoft Windows systems. Once WannaCry enters a PC it locks all the files it finds and demands money to unlock the data. One of the biggest victims was the British National Health Service, dozens of hospitals were forced to cancel oper