No. I said 3rd party "ADDITIONS". The kind that stay with your system and run 24/7. I know it is fine distinction, but it is the terminology used in the forum, and I'm guilty of throwing out as if everyone understands.
MalwareBytes is a run it once, then you can throw it away if you like.
Also the Mac version of MalwareBytes was written by a well respected Apple Discussions Forum contributor (r_thomas), so it is trusted to just do what it says.
But if you like, then try these manual instructions from Apple
<https://support.apple.com/en-us/HT203987>
Or you can use these instructions
<http://www.thesafemac.com/arg/>
MalwareBytes knows what to look for.
And the same goes for EtreCheck. It is a utility written by another forum contributor (etresoft). It collects information when you run it. It does not use privileges. It does not phone home. It presents the information to you, and you can do what you want with it. If you wish you can search the forums for EtreCheck output and find thousands of posts. Generally the users that have posted EtreCheck output have received useful help.
If you do not like the EtreCheck approach, find a post by Linc Davis which has instructions on collecting information manually (there are hundreds, maybe thousands of those in the forums; EtreCheck is just easier).