Hackers stole around $2.1 million from DeFi platform Onyx Protocol on October 27 as a result of an illiquid marketplace exploit.
According to PeckShield, the company probably identified the incident when the protocol team had not yet become aware of the attack.
According to the company's specialists, the attackers took advantage of a known rounding problem in the popular Compound v2 fork, which underlies the Onyx architecture.
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This flaw was used by attackers in April to steal around $7 million from Hundred Finance.
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The attackers used flash loans to attract resources for the attack and manipulate exchange rates.
The Onyx hackers have sent part of the stolen funds to cryptocurrency mixer Tornado Cash.