It's one of the largest crypto heists in history.

The vulnerability has been fixed and funds "restored" to accounts, the company said.

The research reveals prolific North Korean hacking efforts emanating from one of its most visible hacking groups.

"I don't care," the suspect previously told the New York Times. "They can come arrest me. I would laugh at them. I haven't done anything."

Wednesday's incident quickly follows the theft of around $7.4 million dollars worth of ether reported earlier this week.