https://www.bleepingcomputer.com/news/security/us-sanctions-crypto-mixer-tornado-cash-used-by-north-korean-hackers/

The U.S. Treasury Department's Office of Foreign Assets Control (OFAC) sanctioned Tornado Cash today, a decentralized cryptocurrency mixer service used to launder more than $7 billion since its creation in 2019.

The North Korean-backed APT Lazarus Group also used the crypto mixer to launder approximately $455 million stolen in the largest known cryptocurrency heist ever.