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Post Pectra ‘Malicious’ Ethereum Contracts Are Trying to Drain Wallets, But to No Avail: Wintermute

Malicious Ethereum contracts designed to drain wallets with weak security aren’t profiting from the operation, crypto market maker Wintermute said Friday, identifying these contracts as «CrimeEnjoyors.»
The whole issue is tied to the Ethereum Improvement Proposal (EIP)-7702, part of the Pectra upgrade that went live early last month. It allows regular Ethereum addresses, secured by private keys, to temporarily operate as smart contracts, facilitating batched transactions, password authentication and spending limits.
The regular Ethereum addresses delegate control of their wallets to smart contracts, granting them permission to manage or move their funds. While it has simplified the user experience, it has also created a risk of malicious contracts draining funds.
As of Friday, more than 80% of delegations made through EIP-7702 involved reused, copy-and-paste contracts designed to automatically scan and identify weak wallets for potential theft.
«Our Research team found that over 97% of all EIP-7702 delegations were authorized to multiple contracts using the same exact code. These are sweepers, used to automatically drain incoming ETH from compromised addresses,» Wintermute said on X.
«The CrimeEnjoyor contract is short, simple, and widely reused. This copy-pasted bytecode now represents the majority of all EIP-7702 delegations. It’s funny, dark, and fascinating all at once,» the market maker added.
Notable cases include a wallet that lost nearly $150,000 through malicious batched transactions in a fishing attack, as anti-scam tracker Scam Sniffer noted.
Still, the large-scale money drain has not been profitable for the attackers. The CrimeEnjoyors spent approximately 2.88 ETH to authorize around 79,000 addresses. One particular address –0x89383882fc2d0cd4d7952a3267a3b6dae967e704 – handled more than half of these authorizations, with 52,000 permissions granted to it.
Per Wintermute’s researcher, the stolen ether can be traced by analyzing the code of these contracts. For the above example, the ETH is destined to flow the address –0x6f6Bd3907428ae93BC58Aca9Ec25AE3a80110428.
However, as of Friday, it had no inbound ETH transfers. The researcher added that this pattern appears consistent across other CrimeEnjoyors as well.
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Bitcoin Mining Profitability Fell in August, Jefferies Says
Bitcoin (BTC) mining profitability declined 5% last month primarily becuase of an increase in the network hashrate, investment bank Jefferies said in a research report Sunday.
«A hypothetical one EH/s fleet of BTC miners would have generated ~$55k/day in revenue during August, vs ~$58k/day in July and ~$44k a year ago,» wrote analysts led by Jonathan Petersen.
The hashrate refers to the total combined computational power used to mine and process transactions on a proof-of-work blockchain, and is a proxy for competition in the industry and mining difficulty. It is measured in exahashes per second (EH/s).
U.S.-listed mining companies mined 3,573 bitcoin in August versus 3,598 in July, the report noted, and these miners accounted for 26% of the Bitcoin network last month, unchanged from July.
MARA Holdings (MARA) mined the most bitcoin of the group, with 705,703 tokens, followed by IREN (IREN), Jefferies said.
MARA’s energized hashrate is still the largest of the group, at 59.4 EH/s, with CleanSpark (CLSK) second with 50 EH/s, the report added.
Read more: Bitcoin Network Hashrate Returned to All-Time Highs in August: JPMorgan
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PEPE Price Sinks 6% Amid Market Sell-Off as Whales Accumulate

Meme-inspired cryptocurrency PEPE has lost nearly 6% of its value in the last 24-hour period, sliding to a $0.0000107 low even as large investors accumulate.
Trading volumes for the cryptocurrency surged into the trillions of tokens amid the drop, as the token kept failing to find support amid the intense selling pressure. The drop came amid a wider crypto market drawdown, where the broader CoinDesk 20 (CD20) index lost 1.8% of its value.
Memecoins were especially hard hit in the sell-off. The CoinDesk Memecoin Index (CDMEME) dropped nearly 5% over the last 24 hours, while bitcoin saw a drop of 0.8%.
The drop comes just days after altcoin season speculation grew among cryptocurrency circles over the Federal Reserve’s expected interest rate cut later this week, which is expected to be a boon for risk assets.
Data from Nansen shows that over the past week, the top 100 non-exchange addresses holding PEPE on the Ethereum network have seen their holdings grow by 1.38% to 307.33 trillion tokens, while exchange wallets had a 1.45% drop in holdings to 254.4 trillion tokens.
Technical Analysis Overview
PEPE’s price action pointed to a market in retreat, according to CoinDesk Research’s technical analysis data model. The token dropped from $0.000011484 to $0.000010782, with sellers dominating the chart.
Price peaked at $0.000011732 during a resistance test, but volume swelled to 5.5 trillion tokens at that level, before the market ultimately turned lower.
Support showed signs of buckling during the next phase, with the token brushing against $0.000010746. Trading activity intensified again, hitting 7.7 trillion tokens and reinforcing bearish sentiment.
The cryptocurrency’s price whipsawed within a 9% intraday range, a sign that traders remain unsure whether support levels are going to hold.
Disclaimer: Parts of this article were generated with the assistance from AI tools and reviewed by our editorial team to ensure accuracy and adherence to our standards. For more information, see CoinDesk’s full AI Policy.
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Ether Bigger Beneficiary of Digital Asset Treasuries Than Bitcoin or Solana: StanChart

Digital asset treasuries (DATs), publicly traded firms that hold crypto on their balance sheets, have been hit hard in recent weeks as their market NAVs (mNAVs) slid below 1, Standard Chartered’s Geoff Kendrick said in a new report.
Looking ahead, ether (ETH) DATs appear to have the most staying power thanks to staking yield, regulatory clarity, and room to grow, argued Kendrick.
The mNAV ratio is crucial. When it falls, these firms lose the incentive (and sometimes the ability) to keep buying crypto, threatening a key source of demand for bitcoin (BTC), ether and solana (solana).
Kendrick said that the next phase for DATs will be one of differentiation. The winners will be those that can raise funds at the lowest cost, achieve scale that draws liquidity and investor attention, and, crucially, earn staking yield. That last point tilts the playing field toward ether and solana treasuries over bitcoin, which lacks yield.
Market saturation is also at play. Strategy’s success as the flagship BTC treasury has inspired a flood of copycats, nearly 90 at last count, who together now hold more than 150,000 BTC, up sixfold this year, the analyst noted.
But if mNAVs stay below 1, Standard Chartered expects consolidation. For BTC treasuries, that could mean firms like Saylor’s Strategy buying out rivals rather than buying new bitcoin on the open market, a coin rotation, not fresh demand.
Ether treasuries look better positioned. They have been aggressively accumulating, with 3.1% of ETH’s circulating supply purchased since June. The largest player, Bitmine (BMNR) is well-placed to keep adding to its 2 million ETH stack, the report said.
For crypto markets, this matters. DAT buying has been a key driver of bitcoin and ether prices in 2025. But with BTC treasuries facing consolidation pressure and solana treasuries still relatively small, Standard Chartered sees ETH as the likely beneficiary going forward.
Read more: Strategy’s S&P 500 Snub Is a Cautionary Signal for Corporate Bitcoin Treasuries: JPMorgan
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