On 12 May 2017, a new version of ransomware, dubbed WannaCry, hit Spanish mobile operator Telefonica, followed by hospitals and clinics across the UK, forcing the National Health Service to accept only the most urgent patients. Within a few hours, the ransomware malicious software spread quickly across almost 100 countries, including Russia and the USA. It was said to be the biggest ransomware outbreak detected until then.
This is an 17s video of the attack. View a more detailed visualisation