Marcus Hutchins (born June 1994), also known online as MalwareTech, is a British computer security researcher and the elder son of Janet Hutchins, a Scottish nurse, and Desmond Hutchins. In 2013, he launched the anonymous MalwareTech blog, which gained popularity among security professionals and hackers for its in-depth technical analyses of malware. Hutchins rose to international prominence on 2017-05-12 when he identified and activated a kill switch domain that effectively halted the rapid spread of the WannaCry ransomware attack, which had infected hundreds of thousands of computers worldwide, including crippling the UK's National Health Service (NHS). He is employed by the cybersecurity firm Kryptos Logic and has been described as a self-taught expert in IT security and computer science. However, his hero status was complicated just months later; on 2017-08-03, FBI agents arrested the then-23-year-old in Las Vegas, Nevada, on suspicion of authoring and/or selling Kronos (also known as Chronos), a banking trojan malware designed to steal online credentials. The arrest drew significant attention given his recent contributions to cybersecurity. He has been interviewed by media figures such as Andy Greenberg and featured in outlets like Wired magazine.