Someone Signed One Ethereum Transaction and Lost $999,999 in USDT Without Getting Hacked

• An Ethereum phishing scam drained $999,999 in USDT after a user unknowingly approved a malicious ERC-20 token permission, without any wallet hack or stolen private keys
• Scam Sniffer found the attacker retried the transaction 36 seconds after an initial failed attempt, recalculating the wallet balance before successfully emptying it
• The incident points to a growing crypto wallet security risk, showing how a single signature can authorize scammers to move funds even when users store assets in secure wallets

Bitcoin can swing 10% in a day, and most crypto investors have learned to live with that. What many still overlook is how quickly an Ethereum phishing scam can wipe out an entire wallet without exploiting a single line of code. This is exactly what happened after one user lost $999,999 in USDT by approving what appeared to be a routine transaction. The incident is another reminder that crypto’s biggest risks aren’t always tied to market volatility.

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Why This Ethereum Phishing Scam Didn’t Need to Hack a Wallet

According to blockchain security firm Scam Sniffer, the victim unknowingly signed a malicious ERC-20 token approval on Ethereum. This approval allowed the attacker to move USDT directly from the wallet without needing the owner’s private keys.

On-chain data shows the stolen funds were moved across Ethereum blocks 25489460 and 25489463. This is where the attacker quickly split the USDT into three separate transactions. Scam Sniffer said the attacker used Ethereum’s Multicall function to bundle multiple actions into a single transaction, dramatically reducing the time the victim had to revoke the approval.

Unlike many high-profile crypto thefts, this USDT phishing attack didn’t rely on exploiting code or breaking into a wallet. Every transaction was technically authorized by the victim.

Are ERC-20 Token Approvals a Favorite Scam for Exploiters?

Approving tokens is part of everyday activity on decentralized exchanges and DeFi applications. It allows smart contracts to move assets on a user’s behalf.

The same feature has become a favorite target for scammers. By tricking users into approving a malicious contract, attackers can access funds without needing another signature. In many cases, those permissions remain active until users manually revoke them.

The Ethereum phishing scam is one of many stories. In May, a fake Uniswap website reportedly drained around $400,000 after users approved a malicious contract. More recently, a fake HyperSwap airdrop used the same tactic to empty another wallet within seconds.

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Crypto Wallet Security Starts Before You Click “Approve”

Security experts say hardware wallets remain one of the safest ways to store crypto. But they cannot prevent users from authorizing malicious transactions. Once a dangerous approval is signed, the wallet simply follows the instructions it was given.

Scam Sniffer recommends reviewing every signature request carefully, checking the contract address and permission scope, and regularly revoking unused or unlimited token approvals through trusted revocation tools.

This story is not just about a smart contract exploit or stolen credentials. The blockchain worked exactly as designed. The signature was valid. For years, crypto investors have focused on surviving price swings. But security researchers say the bigger threat comes from a moment of inattention. A bad trading day might trim a portfolio. One careless signature can empty it entirely.

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