I find all this “bog down your system” answers to be a crock of shit. Go run ESET nod32 and put it in interactive mode. Yes, you’ll get a lot of prompts but damn you’ll learn so much about what’s going on in your computer and the networks it’s reaching out to. If you’re on windows run glass wire or OSX run little snitch. I used to know a Linux alternative for those but the point stands that you should have tools that you can use in a desktop setting to really understand what is running, and what it’s connecting to. You should have a program running that can check against a database of hashes of files for signature matches. It seems though like there’s not strong enough AV. And I suspect that’s on purpose so state actors can easily get into our systems in all nations.