Most is malware these days. Checkout Safing Portmaster and config blocking various outbound connections and pick a good DNS filter like AdGuard. Then if you get malware it won't be able to connect to CnC server.
this post was submitted on 06 Aug 2023
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You don't need an antivirus with Linux.
See #5 here: https://www.kuketz-blog.de/truegerische-sicherheit-virenscanner-apps-sind-schlichtweg-ueberfluessig/. Most commercial antivirus contain spyware themselves. It's an industry-wide problem. This is problem 1 with commercial AV. Problem 2 is that the AVs run highly privileged and are often badly secured themselves. So you open up security holes just by running an AV.
Problem 3 is most malware devs ensure first that no antivirus detects their stuff before spreading it. So don't run commercial AV on your own system. Use virustotal.com and common sense