Two hacker groups associated with North Korea, the Lazarus Group and APT38, were responsible for the theft last June of $100 million from U.S. crypto firm Harmony's Horizon bridge, the Federal Bureau of Investigation said on Monday.
On January 13, the groups used a privacy protocol called Railgun to launder over $60 million worth of ethereum stolen during the theft in June, the FBI said in a statement.
A portion of the stolen ethereum was subsequently sent to several virtual asset providers and converted to bitcoin, the FBI said.
The FBI said North Korea's theft and laundering of virtual currency is used to support its ballistic missile and Weapons of Mass Destruction programs.