Days in Operation:
Owners of high-value NFTs are having their Opensea-listed assets pulled out from under them by an unknown attacker. Either the new Opensea contract was hacked, or users were hit by a phishing attack. The hacket sent a fake email designed to have people sign half of a valid wyvern order (e.g., the order was basically empty except the target (attacker contract) and calldata) and the attacker signs other half of order.
Any users who interacted with Opensea’s new contracts should revoke the token approvals from Opensea immediately. Etherscan and Revoke.cash both provide interfaces for this, but are experiencing intense server load. Use whichever service will load. The attacker currently holds 641.5 ETH liquid, and many high-ticket NFTs, including 17 Azuki, 3 BAYC, 2 Cool Cats, and 2 Mutant Ape Yacht Clubs. The attacker also pocketed a racial slur ENS name. The loss amount include the values for the high-valued 16 Azuki's and 3 BoredApeYachtClub's estimated at 48 and 177 ETH respectively.
Updated 2/23/22: Loss statistics for @opensea phishing incident:
1. The hacker sold NFTs valued at more than 1,200 Ether (~$3.4m), most of the funds has been deposited to @TornadoCash
2. The hacker returned most of the unsold NFTs to victims
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