The attacker swapped the stolen DAI and USDC for approximately 689.2 ETH and deposited the funds into the cryptocurrency mixer Tornado Cash to obscure the transaction trail

From the articleNotional Finance faces suspected $1.7M exploitAlso in Notional Finance Escrow Contract Faces Reported $1.7M Exploit, Notional Finance Escrow Contract Shows Signs of $1.7 Million Exploit, Funds Moved to Tornado Cash, Notional Finance Hit by $1.7 Million Exploit From Integer Overflow Bug