Magnify the mouse pointer on Mac If you have difficulty seeing or following the mouse pointer when it moves — or it changes to an insertion point, crosshair or other shape — you can increase its size.
On your Mac, choose Apple menu > System Preferences, then click Accessibility.
Click Display, click Cursor, then drag the Cursor size slider to the right to make it larger.
Also, To Secure your macOS from virus and trojans, use always a mac optimization software like Mac optimizer.