Although on-chain hacks including smart contract exploitation, price manipulation and governance attacks are most prevalent, off-chain attacks like private key theft represent 29% of the total number of attacks and 34.6% of the funds stolen in general. In 2023 off-chain attacks made up 56.5% of total attacks and accounted for 57.5% of the stolen amount.
Source: https://www.coindesk.com/business/2024/08/12/defi-hacks-remain-a-major-threat-despite-50-decline-in-2023-halborn/?utm_medium=referral&utm_source=rss&utm_campaign=headlines