https://arstechnica.com/tech-policy/2017/08/researcher-who-neutralized-wcry-pleads-not-guilty-to-writing-banking-malware/

Marcus Hutchins, the British security researcher instrumental in neutralizing the virulent WCry ransomware worm that shut down computers worldwide in May, appeared in federal court Monday and pleaded not guilty to unrelated criminal charges that he created and distributed malware that steals banking credentials.