North Korean hackers stole 342K ETH from Upbit in 2019 and laundered through exchanges in over 51 countries.Investigations by South Korea and the FBI traced crypto trails, recovering only 4.8 BTC from the billion-dollar theft.The heist highlighted weaknesses in crypto systems and the role of state-sponsored cybercrime in bypassing global sanctions.North Korea used laundering techniques and covert exchanges to convert 57% of the stolen funds into Bitcoin.