Marcus Hutchins has been credited with stopping the ransomware attack

The young cyber expert who saved the NHS from hackers is working with GCHQ to head off another attack, it has been claimed. Marcus Hutchins has been credited with stopping the WannaCry ransomware attack from spreading across the globe by accidentally triggering a “kill switch”. 

http://www.telegraph.co.uk/news/2017/05/14/revealed-22-year-old-expert-saved-world-ransomware-virus-lives/