South Korean authorities have accused North Korean hackers of stealing $50 million worth of crypto from the Upbit exchange in 2019.The hackers behind the attack were identified as notorious hacker groups Andariel and Lazarus.The stolen ETH tokens, which were valued at $147 at the time of the hack, have now risen in value to over $1 billion.In addition to the hack, the South Korea Financial Services Commission has accused Upbit of violating Know Your Customer (KYC) rules.