Famed white hat hacker Marcus Hutchins -- better known as "MalwareTech" -- was arrested by the FBI yesterday while trying to fly home to the United Kingdom from Las Vegas. The 22-year-old security researcher gained mainstream fame earlier this year as the guy who stopped the destructive WannaCry ransomware from spreading, and had been partying with friends near the Black Hat and Defcon hacker conferences before his arrest. Now, he faces serious federal charges for allegedly creating the Kronos banking trojan. But he's supposed to be the good guy!