According to Scam Sniffer, a user lost 143.45 ETH (about $460,800) yesterday due to transaction simulation fraud. Transaction simulation is a feature in Web3 wallets that allows users to view the expected results of a transaction before signing. This feature is designed to improve transparency and user experience. However, the attacker took advantage of the delay between transaction simulation and execution, and tampered with the on-chain status immediately after the transaction was submitted by creating a phishing website.