Unlucky MEV Bot Loses $12 Million Loan in Failed Sandwich Attack

不幸的 MEV 機器人在失敗的三明治攻擊中損失了 1200 萬美元貸款

On September 5, blockchain analytics firm Arkham Intelligence reported an incident involving a Maximum Extractable Value (MEV) bot. The bot borrowed a staggering $11.97 million in Wrapped Ether (WETH) to execute a "sandwich attack" on a user attempting to trade Shuffle (SHFL) tokens worth approximately $5,000.

9 月 5 日，區塊鏈分析公司 Arkham Intelligence 報告了一起涉及最大可提取價值 (MEV) 機器人的事件。該機器人借用了價值 1197 萬美元的 Wrapped Ether (WETH)，對試圖交易價值約 5,000 美元的 Shuffle (SHFL) 代幣的用戶執行「三明治攻擊」。

The MEV bot engaged in a series of 14 transactions, borrowing and lending funds in USDC and WETH through DeFi platforms Aave and Uniswap. However, after completing the attack and covering gas fees, the bot managed to profit by a mere $20.

MEV 機器人進行了一系列 14 筆交易，透過 DeFi 平台 Aave 和 Uniswap 借入和借出 USDC 和 WETH 資金。然而，在完成攻擊並支付汽油費後，該機器人僅獲利 20 美元。

Arkham Intelligence provided data indicating that the entire transaction occurred within a single block, with the bot executing all transactions within 12 seconds.

Arkham Intelligence 提供的數據表明整個交易發生在一個區塊內，機器人在 12 秒內執行了所有交易。

Mechanics of a Sandwich Attack

三明治攻擊的機制

In a sandwich attack, an attacker intercepts a victim's transaction with two of their own transactions. The victim's transaction is placed in the mempool, where it awaits inclusion in a block. The attacker then submits a transaction with a high gas fee, ensuring it is processed first, and another with a lower gas fee, ensuring it is processed after the victim's transaction.

在三明治攻擊中，攻擊者用自己的兩筆交易攔截受害者的交易。受害者的交易被放置在記憶體池中，等待被包含在區塊中。然後，攻擊者提交一筆燃氣費較高的交易，確保首先處理該交易，然後提交另一筆燃氣費較低的交易，確保在受害者的交易之後處理該交易。

The attacker exploits this manipulation by purchasing the victim's asset at a below-market price and selling it within the same block, profiting from the price difference minus gas fees.

攻擊者利用這種操縱行為，以低於市場的價格購買受害者的資產，並在同一區塊內出售，從差價減去汽油費中獲利。

Previous Success of MEV Bots

MEV 機器人先前的成功

Despite the failure of this particular MEV bot, such bots have historically been lucrative for their operators. For example, in April 2023, the notorious MEV bot operator "jaredfromsubway" netted over $1 million in a week through sandwich attacks on PEPE and WOJAK memecoin traders.

儘管這個特定的 MEV 機器人失敗了，但此類機器人歷來對其運營商來說都是有利可圖的。例如，2023 年 4 月，臭名昭著的 MEV 機器人運營商「jaredfromsubway」透過對 PEPE 和 WOJAK memecoin 交易者的三明治攻擊，一周內獲利超過 100 萬美元。