Potential malware from ybb-network.com

In my Screen Time on my Apple account, I'm seeing 24 hours a day over the last few weeks of accessing "https://ybb-network.com/ ". Screen Time confirms this is coming from my Mac Laptop. I assume this is some kind of malware. Any suggestions on how to find the source of the malware and remove it? Obviously I'd love to find the true source of the problem. UPDATE: I downloaded the free trial of Malwarebytes, based on the recommendations here and after reading in several places that it's a trustworthy app. It found a few "threats" in its scan: I pressed the "quarantine" button on these, and I checked my browser extensions in Safari and Chrome, but I'm not seeing anything suspicious. Any other advice on how to remove them?