Go to your browser (Safari, and/or Chrome and/or Firefox) and make sure there are no extensions installed or changes made to the search engine or home page. Make this new account an Admin account (select the account and click the checkbox “Allow user to administer this computer”), make sure you set a different password for this account, and restart your computer. If you only see your own user account and it is listed as an Admin, create a new User Account (click the plus sign at the bottom of the left-side list, after unlocking the padlock at the bottom-left). 
My recommendation is that you have two user accounts for yourself, one with Admin privileges, and another that’s a Standard account.
Open System Preferences > Users and Groups and make sure you are the only user and that the Guest User account is turned off (greyed out). If you suspect a RAT but don’t see a way to disable it, read on for more tips. Sometimes a hacker gained access using the macOS’ built-in remote support tool, so to stop this, open System Preferences > Sharing, and uncheck all the options listed, including Screen Sharing, File Sharing, Remote Login, and Remote Management. RATs come in many flavors, including LogMeIn and TeamViewer, or an odd or unfamiliar name (like AlienSpy). If you have a RAT and you’re not using a tech support person to help you, by all means end that RAT to stop a hacker from controlling your Mac.Įnding the RAT usually means using a 2-finger click on the icon, and then choosing a quit or similar option from the menu. Bona fide support technicians (like ) may use a RAT legitimately, but that’s the only time a RAT could or should be running on your Mac. RATs can take over your computer and the hacker can then do nearly anything to it that they could do if sitting in front of your Mac. 
Hackers like to install RATs (e.g., Remote Access Terminals) that give them remote access to your Mac.
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