I may suggest you reading on this Clipboard virus (Free Instructions) - Removal Guide.

I suspected that still belongs to the Trojan virus, you should have a full scan of your computer have used if you suspected that there's unusual behavior in your PC, like also running slow your computer while browsing in your computer.  In the above link that I have shared, there's a guide on how to clean your PC safe and you should take an action before the intruder will get your fund.  As soon as possible, clean your PC now.

Make sure that your account on exchange has multiple layers of security, like enabling 2FA verification.  Scammer won't execute withdrawal without your permission.