Check to see what you have in:
/System/Library/LaunchAgents/
/System/Library/LaunchDaemons/
/Library/LaunchAgents/
/Library/LaunchDaemons/
~/Library/LaunchAgents/
If you have malware, these are the most common places they will reside.
With Catalina and APFS, there's really no need for anti-virus software. The system files are stored on a read-only partition. Whatever malware users encounter are probably installed by the users themselves. These are trojans, not viruses. No anti-virus can protect users from themselves. Running anti-virus software will only eat CPU cycles and RAM because of the background processes they run.