Malware/virus?

Hey there! I think my computer might be infected. I keep getting pop-ups on Safari, and I've never had that problem before. A few weeks ago I tried to download a program (pirate/not verified... yeah I now it's stupid) and install it. During the installation Terminal opened up on my computer and it wrote things on terminal by it self. I obviously got a bad feeling by that so I shut it down and removed the program with an app called AppCleaner.

I have Mac OS Big Sur 11.2.3 installed. It's a MacBook Pro 13" from mid 2014.

As I got a bit panicked today I googled "malware mac" and ended up on "Insider" which linked to a malware software called CleanMyMacX which I downloaded and installed. I haven't done anything else with it but it popped up and said:

"2 threats found:

Genieo (Install Mac)

OSX.Pirrit"

I have no idea if this software is reliable and if this is true so... Please help me? How do I find out if and what kind of malware/virus I've got on my computer and then - how do I get rid of it?

Thankful for any support!

Sara

Edit: I have AdBlocker installed and when I started getting these pop-ups I was stupid and installed more safari plug-ins.. 1Blocker, DuckduckGo and Hush. Also when I had downloaded that fishy software I had actually downloaded two different versions and the other one I still have on my computer, never actually finished the installation though as it just stopped halfway through.