Chainalysis identified a growing attack pattern targeting unverified DeFi contracts, with hackers stealing $36.7 million across four exploits since January.
Unverified smart contracts were linked to at least $36.7 million in losses across four DeFi exploits over the past six months, as attackers increasingly target protocols whose source code is not publicly available, according to Chainalysis.
The largest incident involved Truebit, which lost $26.2 million after an attacker exploited an integer overflow vulnerability in a contract that had remained unverified on Ethereum since 2021. The other incidents involved Trusted Volumes, Aperture Finance and Ekubo, according to the report.
In each case, the exploited contract had not been verified on a blockchain explorer, meaning its source code was not publicly available for review. According to Chainalysis, that limited scrutiny from security researchers and excluded the contracts from many bug bounty programs despite controlling user funds.
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