Firn Protocol wrote on X: "Two days ago, on-chain detective ZachXBT informed us that an attacker had started making a relatively small deposit with Firn. Thanks to ZachXBT's efforts and our timely actions, we were able to freeze and recover approximately 80 ETH of funds deposited by the attacker. These ETH have been transferred to ZachXBT and he is coordinating their return to the victim."