Full Breakdown
$999,999 USDT Drained in Ethereum Token-Approval Phishing Scam
7/10/2026, 9:31:22 PM
Core Event: Massive USDT Loss via Malicious Token Approval
On July 8, an Ethereum wallet lost 999,999 USDT after the owner signed a deceptive token-approval request. The approval granted a malicious contract permission to move the tokens, allowing attackers to execute three back-to-back transfers of 639,999 USDT, 159,999 USDT, and 200,000 USDT. The first attempt to withdraw roughly $1 million failed because it exceeded the wallet’s balance; 36 seconds later an automated script recalculated the exact remaining amount and completed the sweep. No private keys were compromised—the blockchain executed every transaction exactly as authorized.
Background & Context: Approval-Based Phishing in DeFi
ERC-20 token approvals are routine on decentralized exchanges and DeFi platforms, enabling smart contracts to spend a user’s assets. Scammers exploit this by presenting a familiar signing prompt that actually grants unlimited spending rights. The July 8 incident follows a pattern of similar attacks in 2026: a fake Uniswap site in May drained about $400,000; a counterfeit HyperSwap airdrop in June emptied another wallet within seconds; and on July 4 a user lost $1.65 million after connecting to a fraudulent exchange. In the first six months of 2026, the crypto industry suffered $1.32 billion in security incidents, with phishing identified as the largest source of damage in the first quarter. Scam Sniffer reports that phishing-related losses grew 200 percent in 2026.
Data & Statistics
- Total loss: 999,999 USDT (? $999,999).
- Transaction breakdown: 639,999 USDT, 159,999 USDT, 200,000 USDT.
- Time between failed and successful attempts: 36 seconds.
- 2025 phishing incidents: $723 million lost across 248 cases (CertiK).
- 2026 overall crypto losses (first half): $1.32 billion; phishing the dominant vector.
Official Statements & Responses
Blockchain security firm Scam Sniffer advises users to scrutinize every signature request, verify contract addresses, limit approval scopes, and regularly revoke unused permissions with trusted tools. The firm also highlights the use of Ethereum’s Multicall function, which bundles multiple actions into a single transaction and shortens the window for revocation.
Researcher Ryan Coleman explains that once an unlimited approval is granted, “automated sweeper” scripts can drain funds instantly, leaving victims with virtually no time to react.
Security platform CertiK emphasizes that standard wallet warnings rarely flag approval-phishing attacks, underscoring a systemic gap in user-facing security controls.
Criticism & Opposition
Industry observers criticize major wallet interfaces for lacking real-time alerts when a contract requests unlimited token approvals. The absence of automatic revocation prompts or clearer risk indicators is seen as a design flaw that enables these scams despite the blockchain’s deterministic execution.
Verbatim Quotes
- “? Someone lost $999,999 in USDT after signing a phishing token approval on Ethereum.” — Scam Sniffer report
- “The approval gave attackers unlimited access, enabling an automated sweeper to drain funds.” — Ryan Coleman, blockchain researcher
- “According to the platform, the attackers initially failed when they tried withdrawing as much as $1 million through multicall transactions.” — Scam Sniffer analysis
- “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.” — Scam Sniffer statement
- “Security researchers continue to identify approval phishing as one of the most common social engineering threats in crypto.” — Analytics Insight report
Conflicting Reports & Gaps
All sources agree on the loss amount (999,999 USDT), but one chunk formats the figure as “999,999 USDT?$0.9991,” suggesting a minor typographical inconsistency. No public information identifies the victim, and the precise contract address remains undisclosed, limiting forensic verification.
What’s Next
Scam Sniffer continues to promote revocation tools and browser extensions that flag suspicious approval requests. Users are urged to adopt hardware wallets, disable automatic transaction confirmations, and regularly audit token allowances to mitigate future approval-phishing attacks.
