Sonne Finance confirms attack, about $6.50 million remains

On May 15th, Sonne Finance announced that its Optimism protocol suffered a known donation attack, losing approximately $20 million. The attack exploited a vulnerability newly added to the market. Within two days of the market's creation, the attackers executed key transactions using multi-signature wallets and time-locking functions, successfully manipulating the market's collateral factors (c-factors). Although the Sonne team quickly organized its response after the attack and suspended the market within 25 minutes of discovering the problem to reduce further losses, about $6.50 million of funds were still retained. The Sonne team is working to track down the attacker's identity and has offered a bounty to the attacker to return the funds to avoid further pursuit. At the same time, the Sonne team sincerely apologizes for this incident and is in contact with all possible partners in an effort to recover the funds.