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DeFi Protocol Balancer Says Web Front End Is ‘Under Attack’

On-chain data appears to show the attacker has stolen over $200,000 from users.

Updated Sep 20, 2023, 2:33 p.m. Published Sep 20, 2023, 8:31 a.m.
MetaMask Chrome plugin's warning message
(MetaMask Chrome Plugin)

Decentralized trading protocol Balancer said its web front end is suffering from an exploit and urged users not to interact with the website.

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Tweets from Balancer and a warning from the Metamask wallet suggest the Balancer URL, or web address, has suffered a redirect attack and users are being sent to a malicious page rather than the authentic site. Cybercriminals carry our redirect attacks by exploiting users' trust of a website, inserting a redirection to a malicious page in the website's code or in a phishing email.

Hacks, exploits and scams across the crypto sector have caused losses of over $1 billion by early September this year, according to blockchain security firm Certik. Crypto traders lost $303 million in July alone, the year's worst month for losses from such attacks.

The attacker appears to be part of phishing group "AngelDrainer" according to crypto tracking platform MistTrack. They hacked the website using this method and induced users to approve transfers of funds.

A wallet address identified by internet sleuth ZachXBT appears to show that over $200,000 in digital assets may have been stolen. According to Nansen.ai data, the wallet’s current balance is just over $100,000, with most of the assets being stETH and DAI.

On-chain data suggests that the user behind the wallet has been moving some of the stolen proceeds to Aave.

(Etherscan)
(Etherscan)

MistTrack said that the attacker may have links to Russia based on "relevant intelligence" it has collected, without providing details.

The attack comes roughly a month after Balancer warned the public about an unrelated vulnerability in the protocol's pools and urged users to withdraw their assets.

Balancer has a total value locked of about $700 million, according to DefiLlama data, making it the fourth-largest decentralized exchange.

UPDATE (Sept. 20, 14:32 UTC): Adds additional detail on the attack and further background on Balancer and exploits across crypto this year.

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