So it was a spyware or keylogger, or some script that executed right after you entered your passwored.
They were monitoring you, and waiting for you to allow them access, and they took advantage of it.
I'd ran a deep scan of your pc before anything else. Best bet, format your drive
Thanks already did that. Right after the transaction I scanned with the tools one by one and plugged the network cable after to prevent myself. In fact I am posting with the new installed pc.