Help me understand my Hacked Wallet.

So back in 2017, I mined some ETH and left it. I stored my files on my Desktop or NAS…Never entered my password for keystore other than on a paper in my drawer. Years later I check it out, only to see my total gone. I just want to understand how it might have been taken. I had the Ethereum Wallet app running on my Desktop, no longer in service. Will start mining again, and take a different approach, welcome all suggestions. Link to my wallet address. Thanks