Unpacking the Attack: Sloppy Execution and Prior Rehearsal

According to an analysis shared by Yu Xian, founder of SlowMist, the recent on-chain attack targeting Binance-related hot wallets revealed notably unrefined operational techniques by the attacker. More crucially, the attack was not an impulsive act; the perpetrator conducted several hours of rehearsal on the Ethereum blockchain before executing the actual theft, as evidenced by the initial transactions from the related addresses.

The Role of EIP-7702: A Tool for Batch Sweeping

In this incident, the attacker utilized Ethereum Improvement Proposal EIP-7702. Yu Xian's analysis indicates that the choice of this protocol served a specific, pragmatic purpose: to facilitate the batch and rapid transfer (or sweeping) of a large volume of tokens siphoned from multiple hot wallets. This selection was driven by operational efficiency, not by exploiting a inherent vulnerability within the protocol itself.

The Protocol Isn't to Blame: Attack Logic Exists Independently

Yu Xian explicitly emphasized that EIP-7702, as a technical standard, has no fundamental flaw in its mechanism. Even without this specific protocol, attackers could achieve similar batch asset movement effects through other existing technical pathways or combinations. This incident underscores a recurring lesson: security threats often lie in the malicious application of available tools, rather than in the design flaws of the tools.

  • Key Finding 1: The on-chain operations showed unrefined, non-surgical execution.
  • Key Finding 2: A distinct pre-attack rehearsal phase was identified.
  • Key Finding 3: EIP-7702 was leveraged to enhance post-theft operational efficiency.

The dissection of this event not only outlines the attacker's behavioral pattern but also pushes the community to reflect deeper: when defending against such attacks that leverage standard protocols, enhancing monitoring and early warning capabilities for anomalous transaction patterns and behavioral chains is as critical as scrutinizing protocol security.