Chris Graham A global cyberattack using hacking tools widely believed by researchers to have been developed by the US National Security Agency crippled the NHS , hit international shipper FedEx and infected computers in 150 countries. More than 300,000 computers were infected while the countries most affected by WannaCry were Russia, Taiwan, Ukraine and India, according to Czech security firm Avast. A blog showing where the attack hit CREDIT: @MALWARETECHBLOG M ikko Hypponen, chief research officer at the Helsinki-based cybersecurity company F-Secure, called the attack "the biggest ransomware outbreak in history." Here's everything you need to know. Amber Rudd: 97% of NHS trusts operating 'as normal' 02:12 What was the attack and how does it work? H ackers have been spreading "ransomware" called WannaCry, also known as WanaCrypt0r 2.0, WannaCry and WCry. It is often delivered via emails which t
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