
Orbit Chain exploited, $81.6 million drained from cross-chain bridge
Orbit Chain's cross-chain bridging protocol Orbit Bridge was exploited on Saturday, December 30th, resulting in over $81 million stolen across major cryptocurrencies like USDT, ETH, and WBTC in a matter of hours.
The protocol has confirmed the attack and issued a statement on X.
Preliminary examination into the attack suggests the hacker leveraged the Tornado Cash mixing service to obfuscate transactions before exploiting vulnerabilities in Orbit Chain's Ethereum vault.
Data from Arkham Intelligence shows that the threat actor systematically drained assets from Orbit Bridge, splitting the theft into five transactions totaling $82 million. Transferred funds included $30 million in Tether stablecoin USDT, $10 million of stablecoin USDC, 21.7 million in ETH, $9.8 million of wrapped Bitcoin WBTC, and $10 million worth of DAI.
The exact attack vector is unknown, but the funds were likely stolen by exploiting a vulnerability in the bridging process itself, allowing assets to be minted on one chain without being burned on the originating chain. This points to a weakness in the cryptographic proofs or relayers meant to guarantee atomic transfers.
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