Hong Kong-based cryptocurrency exchange CoinEx has reported a security breach resulting in the theft of over $70 million worth of tokens due to compromised private keys. The exchange is currently investigating the identity of the hackers, with some blockchain security firms attributing the attack to North Korean “Lazarus Group” hackers.

CoinEx has suspended its withdrawal service and is working to build and deploy a new wallet architecture to restore impacted users and functionality of the platform. The exchange has opened communication channels to the hackers in hopes of a mutually agreeable resolution and plans to compensate affected users for any lost funds.