According to data provided by analysts at the Coinbase exchange, during a large-scale hacking of the DeFi Nomad project’s gateway bridge, 88% of hackers turned out to be simple “copycats”.
Recall that in early August, hackers withdrew assets worth $190 million from the Nomad bridge. The hack was called “the most chaotic in the DeFi industry.” The fact is that when updating the smart contract, the developers made a mistake due to which the smart contract automatically confirmed transactions.
Any user could copy an already completed transaction, change the recipient’s address in it to their own, send it to a smart contract and receive tokens to their wallet.
88% of the withdrawal addresses used the same transaction, according to Coinbase’s principal investigator for blockchain threats Peter Kacherginsky and Senior Special Investigations Officer Heidi Wilder.
Initially, two hackers discovered the vulnerability and took advantage of it, and then a lot of “copycats” copied the method and transferred tokens to their wallets. At the same time, it was the first two hackers who withdrew a significant part of the funds in wBTC, USDC and wETH tokens.
Recall that the developers of the Nomad project announced a 10% reward for a refund. And many attackers took advantage of the opportunity to become a “white hacker” – as of August 6, about 12% of the stolen funds were returned to the project, and at the moment the figure has grown to 17%.
Source: Bits
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