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MEV Bot Steals $370K from Phishing Victim on Base Chain

MEV Bot Steals $370K from Phishing Victim on Base Chain

First seen 7 Aug 2026, 12:55 UTC • •
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ThreatCluster AI
ThreatCluster •August 8, 2026 at 11:38 UTC
  • •A phishing attack resulted in a $500,000 loss for a user on the Base chain.
  • •MEV bots exploited the transaction, siphoning off $370,000 during the conversion process.
  • •The victim is actively seeking restitution by contacting the attacker and MEV bot.

On August 7, 2026, a user on the Base chain lost 500,000 USDC due to a phishing attack. The attacker attempted to convert the stolen funds to WETH but used a script without slippage protection, leading to a transaction through a low liquidity Uniswap V4 pool. This resulted in only 67.9 ETH being received, valued at $129,000, while $370,000 was siphoned off by MEV bots. The MEV bot front-ran the transaction by paying just 0.03 USDC and incurred a gas fee of 3.5 ETH. The victim has since sent on-chain messages to both the attacker and the MEV address, claiming to have identified the attacker and offering a 10% bounty for a refund.

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Timeline

2026-08-07
User loses $500K USDC in phishing attack
A user on the Base chain fell victim to a phishing attack, losing 500,000 USDC.
Kucoin
2026-08-07
MEV bot siphons $370K during fund conversion
The attacker attempted to convert stolen funds to WETH, but MEV bots front-ran the transaction, taking $370,000.
Kucoin
2026-08-07
Victim offers bounty for refund
The victim sent on-chain messages claiming to have identified the attacker and offered a 10% bounty for a refund.
Kucoin

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Extracted Entities (6)

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