Hacker Executes $38.5M ETH Buyback After 9-Month Hiatus: A High-Stakes Game of 'Buy Low, Sell High'

In a striking display of market timing and operational patience, a hacker has moved nearly $38.5 million to repurchase 18,273 ETH on August 20, 2024, just over nine months after selling the same asset at a peak price. The transaction, flagged by blockchain researcher Yu Jin, reveals a sophisticated strategy that netted the attacker a 36% profit in USD terms while also increasing their ETH holdings by 1,149 coins. The operation began in November 2023, when the hacker sold 17,124 ETH at an average price of $3,308 per ETH, exchanging them for approximately 56.7 million DAI/USDS. At that time, ETH was trading near its local highs, and the move appeared to be a profit-taking exit. The funds were then routed through Tornado Cash, a privacy mixer that has been sanctioned by the U.S. Treasury’s OFAC, adding a layer of regulatory risk to the entire transaction. Fast forward to August 2024, with ETH trading around $2,109—a 36% decline from the November peak—the hacker re-entered the market. Using a fresh address, the attacker spent 38.5 million DAI (and some USDS) to buy back 18,273 ETH at an average price of $2,109 per ETH. The remaining 18.2 million DAI was left in the wallet, likely as a reserve for future moves. The net result: the hacker now holds 1,149 more ETH than before, plus a significant stablecoin stash, all while profiting from the price differential. This is not a story of a novice or a frantic liquidation. The attacker waited nine months, endured market volatility, and executed a clean swap across multiple DeFi platforms and centralized exchanges. The use of Tornado Cash for the initial deposit, combined with a public market buyback, illustrates a hybrid approach to privacy—partially obscured, yet still traceable by on-chain forensic tools. According to the researcher, the hacker’s address was identified by matching the outflow from Tornado Cash with the subsequent buy transactions. The regulatory implications are significant. Tornado Cash remains under OFAC sanctions, meaning any U.S. person or entity interacting with these funds could face legal consequences. The exchanges and DEX aggregators that handled the buyback may be unaware of the source of funds, but the transaction history is now public. Chainalysis and similar firms are likely to monitor the wallet, potentially flagging it for future compliance reviews. From a market perspective, the impact is minimal. The $38.5 million buy represents less than 0.1% of the daily ETH trading volume in August 2024, and the news is already priced in. However, the psychological effect is more interesting. The hacker’s success reinforces the narrative of “smart money” timing the market, and it may encourage other traders to watch for similar patterns. The 9-month gap also highlights the importance of patience in bearish or sideways markets. The technical execution is noteworthy. The hacker likely used automated scripts or DEX routers to avoid excessive slippage, spreading the buy across multiple transactions over several hours. This level of coordination suggests either a professional team or a highly experienced individual. The attacker’s focus on deterministic outcomes—waiting for a favorable price point—aligns with the cold, mathematical approach often seen in security audits. For the broader crypto ecosystem, this case serves as a reminder of the twin pillars of on-chain transparency and regulatory risk. While the blockchain provides a public ledger of every transaction, the use of mixers like Tornado Cash creates a gray area that regulators are keen to close. The hacker’s ability to profit without triggering a KYC check is a feature, not a bug, of the decentralized finance space—but it carries its own set of risks. In conclusion, this is not a market-moving event, but it is a textbook example of a high-stakes, long-term trading strategy executed by an anonymous actor. The remaining 18.2 million DAI in the wallet suggests the hacker is waiting for another opportunity, or perhaps diversifying into other assets. Either way, the address will be watched closely by analysts and regulators alike. Trust is a variable; proof is a constant.