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The mass wallet-draining attacks linked to Ethereum’s Pectra upgrade involve malicious smart contracts deployed using the EIP-7702 feature, which allows attackers to automate the theft of ETH from wallets with leaked private keys by delegating control to “sweeper” contracts that instantly transfer incoming funds to attacker-controlled addresses.
Wintermute developed and released code named “CrimeEnjoyor” that embeds a warning into Ethereum contracts used to drain ETH from compromised wallets.
Pectra is an Ethereum network upgrade that introduced EIP-7702, enabling externally owned accounts to temporarily operate like smart contract wallets.
Wintermute is a cryptocurrency trading firm
Wintermute publicly reported that Ethereum's Pectra upgrade has enabled mass wallet-draining attacks through EIP-7702-enabled smart contracts.

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