Symbiosis Cross-Chain Protocol Attacked on BSC; 33.6K USD Worth of WBTC Stolen

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On-chain news reveals that the Symbiosis cross-chain protocol was attacked on BSC on September 11, resulting in the theft of $33.6K worth of WBTC. A transaction via BridgeV2 transferred approximately 2^62 syBTC to a new EOA, valued at roughly $4.61 billion. The same address later sold 4.39 WBTC on Ethereum’s Uni V4. The incident has prompted a protocol update to address the vulnerability.

ChainThink reports that on September 11, according to Blockaid monitoring, the cross-chain protocol Symbiosis was attacked on BSC, and the attacker has cashed out approximately $336,000 worth of WBTC.

Monitoring shows that transactions signed by BridgeV2 transferred approximately 2^62 raw syBTC (8 decimal places; valued at around 46.1 billion) to a newly created EOA;

The same beneficiary sold approximately 4.39 WBTC on Ethereum Uni V4.

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