The Confessions of Marcus Hutchins, the Hacker Who Saved the Internet
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Andy Greenberg:

Hutchins hadn’t found the malware’s command-and-control address. He’d found its kill switch. The domain he’d registered was a way to simply, instantly turn off WannaCry’s mayhem around the world. It was as if he had fired two proton torpedoes through the Death Star’s exhaust port and into its reactor core, blown it up, and saved the galaxy, all without understanding what he was doing or even noticing the explosion for three and a half hours.