Jo, as he came to be known to the cybersecurity experts watching his every move, was a hard worker. He rose early, usually by 5 a.m. ET, and worked late into the night, often six days a week. Jo juggled three jobs and constantly applied to more — sometimes as many as 50 a day. He needed the money. Always professional, he quickly moved on from rejection and followed up with recruiters whenever there was a lull in communication. His inbox was full of job matches and interview confirmations. One