Multi-Sig Wallet Drained via Sophisticated Disguised Approval Phishing ∞ Security

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Briefing

A crypto investor’s 2-of-4 Safe multi-signature wallet was compromised in a sophisticated phishing attack, resulting in a loss of $3.047 million in USDC. The attacker exploited the Safe Multi Send mechanism by disguising a malicious approval within what appeared to be a routine transaction, facilitated by a pre-deployed, fake Etherscan-verified contract. The stolen funds were subsequently swapped for Ethereum and routed through Tornado Cash, obscuring the flow of assets. This incident highlights a critical evolution in phishing tactics, targeting the often-overlooked layer of transaction approval integrity.

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Context

The prevailing threat landscape frequently features phishing attempts, but this incident demonstrates an advanced architectural framing, moving beyond simple credential theft. Attackers now leverage seemingly legitimate infrastructure, such as Etherscan verification and established application interfaces, to mask their malicious intent. This particular vector capitalizes on the inherent trust users place in familiar contract patterns and front-end interactions, turning routine operations into an attack surface.

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Analysis

The incident’s technical mechanics involved a meticulously planned sequence. The attacker deployed a counterfeit Batch Payment contract, meticulously designed to mimic a legitimate one, including Etherscan verification and similar address characteristics. This fraudulent contract was then leveraged via the Request Finance app interface.

The victim unknowingly approved two consecutive transactions containing abnormal authorizations, which were artfully concealed within the Safe Multi Send mechanism. This allowed the attacker to drain $3.047 million in USDC from the 2-of-4 Safe multi-signature wallet, subsequently converting the assets to Ethereum and obscuring their trail via Tornado Cash.

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Parameters

Exploited Entity ∞ Unidentified 2-of-4 Safe multi-signature wallet
Vulnerability Type ∞ Sophisticated phishing via disguised approval and contract impersonation
Financial Impact ∞ $3.047 Million USDC
Blockchain(s) Affected ∞ Ethereum
Attack Mechanism ∞ Fake Etherscan-verified contract, Safe Multi Send mechanism abuse, Request Finance app interface
Post-Exploit Activity ∞ USDC swapped to ETH, funds sent to Tornado Cash

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Outlook

Immediate mitigation for users requires heightened scrutiny of all transaction approval requests, irrespective of the interface or apparent legitimacy of the contract. Protocols must enhance their front-end security to detect and flag suspicious contract interactions, even those with Etherscan verification. This event will likely establish new security best practices for multi-signature wallet interactions and decentralized application integrations, emphasizing robust pre-transaction analysis tools. The incident highlights the urgent need for user education regarding the subtle indicators of advanced social engineering.

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Verdict

This incident underscores a critical shift in the threat landscape, where attackers leverage trusted infrastructure and psychological manipulation to bypass traditional security controls, demanding a re-evaluation of user interaction security protocols across the digital asset ecosystem.

Signal Acquired from ∞ cryptoslate.com