From the Wall Street Journal:

“U.S. law enforcement linked the Lazarus Group, an online crime syndicate connected to the North Korean government, to the $540 million hack of the online game Axie Infinity last month.

The theft, infiltrating the network upon which the game is run, was one of the largest in the 13-year history of cryptocurrencies. The perpetrators stole 173,600 ether and 25.5 million of the stablecoin USD Coin, or USDC , worth about $540 million at the time of the attack.”

https://www.wsj.com/articles/u-s-agency-links-north-korea-crime-ring-to-540-million-axie-infinity-crypto-hack-11649966631