PeckShield Flags $27.3M Multisig Wallet Drain Linked to Private Key Compromise

Highlights:

• The multisig wallet drain proves that stolen keys can defeat strong wallet setups and cause faster and larger losses.
• Hackers now use websites and smart contracts to drain wallets before users notice any warning signs.
• Wallet takeovers can spread losses across DeFi positions and personal savings in a single attack.

PeckShield flagged a major crypto security incident after an attacker drained about $27.3 million from a whale-linked multisig wallet. The firm shared the alert on December 18 after tracing suspicious on-chain activity. The case quickly drew attention because multisig wallets usually protect large holdings. However, this incident showed how fast those protections can collapse. PeckShield linked the breach to a compromised private key that allowed full signing access.

🐳 Whale Multisig Breached After Private Key Compromise Drains $27M

A #crypto whale lost about $27.3M after a private key compromise let an attacker drain its multisig wallet and start laundering the funds on-chain

— CryptOpus (@ImCryptOpus) December 18, 2025

PeckShield reported that the attacker gained control after a private key leak enabled valid multisig approvals. As a result, the wallet’s security checks no longer blocked outgoing transfers. This event shows that multisig wallets still depend on secure key handling. Once attackers meet the signing threshold, defenses fail immediately. Consequently, recovery efforts face serious limits.

The attack also demonstrated risks associated with contract interactions. In early January, Espresso co-founder Jill Gunter revealed a different wallet drain totaling approximately 30,000 USDC. She claimed that the loss came after a standard transfer and a contractual interaction. The tokens were transferred to a different wallet soon after. This trend is similar to the dynamics observed in the whale case.

Both cases show that attackers often exploit normal user behavior. Users sign transactions quickly when managing investments or preparing deals. Attackers rely on that speed and trust. As a result, even experienced builders remain exposed. Therefore, wallet security now depends on user discipline as much as software design.

Multisig Wallet Drain Shows Systematic Laundering and Broader On-Chain Risk

After the breach, on-chain data showed the attacker moving funds in an organized manner. PeckShield tracked about $12.6 million, or roughly 4,100 ETH, sent through Tornado Cash. These transfers were manifested in recurring round amounts. This kind of conduct frequently indicates a premeditated laundering instead of panicked selling. Meanwhile, the attacker still held around $2 million in liquid assets.

Security researchers have also noted a wider trend behind the recent crypto drains. The Security Alliance has recently warned that crypto miners now appear on compromised websites. The group claims that there is a security vulnerability in the React JavaScript library that allows it to execute unauthorized code. Attackers may load Code that silently triggers wallet approvals. This approach stretches risk beyond wallets themselves.

Crypto Drainers using React CVE-2025-55182

We are observing a big uptick in drainers uploaded to legitimate (crypto) websites through exploitation of the recent React CVE.

All websites should review front-end code for any suspicious assets NOW.

— Security Alliance (@_SEAL_Org) December 13, 2025

Control of Live DeFi Positions Raises Cascading and Personal Loss Risks

The incident carried further risk because the attacker controlled active DeFi positions. PeckShield said the compromised wallet held a leveraged ETH long on Aave. The wallet supplied about $25 million in ETH and borrowed roughly $12.3 million in DAI. With signing control, the attacker could change or unwind this position. Such moves can trigger market pressure or protocol stress.

Individual users are also still experiencing large losses. A retired North Carolina resident lost over $3 million in XRP on a hardware wallet in October. He explained that the loss erased the savings he had intended to use in buying a home. Although not related, the case demonstrates that wallet drains have long-term personal impacts.