According to WuBlockchain, the crowdfunding platform DAO Maker was attacked, and the USDC that users topped up was transferred out and replaced with about 2,261 Eth, worth more than 7 million U.S. dollars.
Essitimates assume 9,000 to 10,000 USDC accounts on DAO Maker could have been affected by the hack.
Address responsible for the hack still has the USDC in it.
In summary - A total of 2,261 Eth, worth more than $7 million were used to transfer out USDC, as per a report from WuBlockchain.