Those tokens were then swapped for Ether using so-called decentralized exchanges in what Elliptic called “a commonly-seen technique with these hacks.” The hackers made off with cryptocurrencies including Ether and BNB as well as stablecoins Tether, USDC and DAI, researcher Elliptic said in a tweet.
On this occasion, an attacker was able to compromise the private information required to access these wallets, and then trigger transactions that withdrew assets from the Horizon bridge to an external wallet, Jiang said. The Horizon bridge is managed and secured by four wallets, Jiang said, and an authentication from at least two of the wallets-each supported by multiple signatures -is required to validate and execute a transaction. Harmony did not immediately respond to requests for comment. In Horizon’s case, “the theft seems to have happened due to a private key compromise,” said Xuxian Jiang, chief executive officer of security firm PeckShield, which has been contacted by Harmony for support. In February, hackers stole more than $300 million from the Wormhole bridge, followed by a $620 million theft from the Ronin bridge a month later.Įven before to the Horizon hack, more than $1 billion had been stolen from bridges, researcher Chainalysis has estimated. The attack on Horizon, which offers cross-chain transfers between Ethereum and Binance’s Smart Chain, marks the third major bridge hack this year. It wasn’t immediately clear whether any user funds had been stolen.
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