The most popular hacking technique was Private Key Compromise, this technique accounted for 15 hacks totaling more than $583M. That's 42% of the total amount of hacks for 2023.
The data was compiled by me based on open statistics from:
Private Key Compromise:
Poloniex hacks - $126m
Multichain - $126m
Atomic Wallet - $100m
Heco Bridge - $86.6m
CoinEx - $55m
and a few small ones
That's a significant amount of money lost to DeFi hacks in 2023, and the prevalence of private key compromise as the main technique is concerning. It highlights the importance of robust security practices for both individual users and DeFi protocols.