PANews reported on February 24 that SlowMist Cosine monitored that the Infini hacker was very technical and understood smart contract operations, so he was able to steal the funds in its Vault and related strategies with a private key, and stole twice:

11,455,666 USDC
https://etherscan.io/tx/0xacf84c5944f662a4fcf783806993d713a150994932008e72e4e47a58d6665f7f

38,060,996 USDC
https://etherscan.io/tx/0xecb31ff694c0e6c5e5b225c261854c0749ecf5d53c698fcda61f2d8e3db8f9fc