North Korean cybercriminals were behind one of the biggest bank heists in modern history. Only they didn’t use firearms or force to steal bank funds. They used emails.

A criminal complaint filed by the U.S. Department of Justice in June 2018 and made public in September 2018 charged North Korean national Park Jin Hyok, who was part of the North Korea-sponsored hacking team called the “Lazarus Group,” in connection with the 2014 cyberattack on Sony and the 2017 WannaCry ransomware. It also tied Park and his team to the unprecedented 2016 theft of $81 million from a Bangladesh bank.