The old DeFi protocol Balancer was hacked! Losses have exceeded $116 million, but attacks continue

DeFi protocol Balancer suffered a shocking hacker attack! The current loss has reached 116 million US dollars, but hackers are still continuing to commit crimes, and the community is concerned about whether other DeFi protocols will be affected.
(Previous summary: The cross-chain bridge Garden Finance was hacked! The loss was about 5.5 million US dollars, and the official provided a 10% white hat bounty to ask the hacker to pay back the money)
(Background supplement: Three times in two years! The loan agreement Abracadabra Money was attacked by hackers again and lost US$1.8 million, with a total loss of 21 million mg)

Contents of this article

On-chain data shows that the well-known decentralized finance (DeFi) protocol Balancer was shocked to be attacked by hackers on the afternoon of the 3rd. The community monitoring tool immediately captured an abnormal transaction: Balancer treasury address to wallet 0xAa760D53…4675b8e3f moved several large assets worth a total of over $70 million.

What is even more worrying is that the current hacker attacks have not stopped. On-chain data shows that hackers are continuing to extract funds from pools on multiple chains, and the actual losses may be further expanded.

The protocol @Balancer appears to have been exploited — about $70.6M in assets was transferred out, including:

6,587 $WETH($24.46M)
6,851 $osETH($26.86M)
4,260 $wstETH(~$19.27 M)img/datapic/fx/2025122918171501 pic.twitter.com/SUHwwGzI47

— Lookonchain (@lookonchain) November 3, 2025

The first batch of more than 70 million US dollars was transferred

Currently, the official Balancer However, some analysis in the community pointed out that in this attack, hackers were suspected of using Flash Loan with a price synchronization vulnerability. By repeatedly trading WETH, osETH, wstETH and other assets, they artificially distorted the price in the pool, thereby draining liquidity.

After Balancer was first discovered to be hacked, the community’s initial statistics of the affected assets were as follows, with a total value of more than 70 million US dollars:

• WETH approximately 7,800 pieces, approximately 24.46 million USD
• osETH approximately 6,851 pieces, approximately 26.86 million USD
• wstETH approximately 5,431 coins, approximately US$19.27 million
• Others (rETH, frxETH, etc.) approximately US$10 million

In addition, this attack has affected multiple chains such as the Ethereum mainnet, Base, Arbitrum, Polygon, Optimism, and Sonic, and community panic continues to rise.

This is not the first time I have been attacked! Balancer’s security record is in red again

It is understood that this is not the first time Balancer has been attacked: in 2021, hackers exploited deflation token (STA, STONK) accounting loopholes and stole approximately US$500,000, which was later compensated by liquidity providers; in 2023, front-end DNS hijacking combined with contract vulnerabilities resulted in a loss of US$238,000.

The amount of losses rose to US$116 million

What is frightening is that hacker attacks are still continuing at the time of writing. According to monitoring by Aunt Ai, a data analyst on the chain, the current losses have risen to US$116 million. At the same time, whether this attack will affect other DeFi protocols remains to be investigated.

The amount stolen from the old DeFi protocol Balancer has exceeded US$116 million

The scope of the impact is still uncertain. The more worrying point is whether the attack on Balancer will affect other DeFi protocols or even cause a cascading effect

Attacker address 👉 img/datapic/fx/2025122918171504 pic.twitter.com/6XOhP47At7

— Ai Ai (@ai_9684xtpa) November 3, 2025