Last week, in the UK, the NHS (National Health Service) was held to ransom by malware stolen from the NSA (National Security Agency), in America. The Nissan car plant in Sunderland was also hit by the hackers.
The virus was unleashed across the world and spread at unprecedented speed. So far, more than 99 countries have been affected, with more than 57,000 victims. The virus, known as WannaCry, and variants of that name, has spread itself across the world, using email.
The ransomware software encrypts files. It then asks for a digital ransom of US$300, to be paid by Bitcoin, before control is safely returned.