The decentralized cross-chain transaction protocol THORChain (RUNE) updated the attack situation, claiming that the amount of lost assets was about 4000 ETH. Estimates as to the scale of the damage vary, with THORChain revising the initial estimate that 13,000 Ether (ETH) (worth $25.1 million) had been stolen, bringing the total down to 4,000 ETH (roughly $7.6 million) as a ballpark for damages. A subsequent community-provided rundown of stolen assets suggests the figure is closer to $6 million. The attacker exploited a bug in Bifrost, which is THORChain’s bridge to the Ethereum network. The code has an override loop (designed only to be used in a vault transfer incident), which was manipulated in this hack. The hacker wrapped the router with their own contract and used the override function to set a transaction msg.value of 200. When Bifrost processed the transaction, it only read the msg.value and believed that the attacker had deposited 200 tokens, but the actual deposit was for 0. This hack was repeated in a loop, extracting value from various liquidity pools.
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