How can I remove malware?

Protect your Mac from malware - Apple Support

If you suspect you have malware then you can download and run Malwarebytes. It's about the most proven anti-malware software for Mac. and the only one recommended by Apple Support reps.

Effective defenses against malware and other threats - Apple Community

Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

EtreCheck is a simple little app to display the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to help people help you with your Mac.

http://www.etresoft.com/etrecheck

Pastebin is a good place to paste the whole report...

https://pastebin.com/

Or use the paperclip at the bottom of a Reply to attach the full report here. :)

Workable but harder for me to work with...the Note tool on the bottom of this editor's toolbar, as shown in the image, to copy and paste the output from EtreCheck.

There is also free Malwarebytes which may take care of it...

https://www.malwarebytes.com/mac/