According to blockchain security company SlowMist, the North Korean hacking group Lazarus was responsible for the attack on the crypto exchange CoinEx.
Sanctions against three people have been announced by the Office of Foreign Assets Control of the U.S. Treasury because they are reportedly connected to North Korea's infamous Lazarus Group.
The FBI also verified earlier this month's claims made by individuals that the hackers had begun transferring a sizeable portion of the monies using privacy techniques.