$6 million was taken out of DeltaPrime, a DeFi platform running on Avalanche and Arbitrum blockchains, due to a compromised private key of an admin address.
The hacker took over an admin proxy and redirected traffic to an opposed contract, impacting the project's Arbitrum version.
Security researcher Chaofan Shou discovered the hack and estimated a loss of around $6 million, making it one of the largest crypto hacks this year.
There are suspicions that the hack may be connected to North Korea's state-sponsored hackers, Lazarus Group.