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https://macremover.com/uninstallguides/2017/08/20/remove-malwarebytes-3-0-macos/

Use manually removal solution to remove Malwarebytes in your macOS
The steps listed below will guide you in removing Malwarebytes:
1. Switch to the Finder and select Go -> Utilities from the Finder menu.
2. Locate the Activity Monitor icon and double-click on it.
3. On the main window of Activity Monitor, find the entry for Malwarebytes, FrontendAgent, RTProtectionDaemon, SettingsDaemon, select them and click Quit Process.
4. The following files/folders of Malwarebytes, you need to use “rm” command to delete on the Terminal.

* /Library/Application Support/Malwarebytes
* /Library/Extensions/com.malwarebytes.mbam.rtprotection.kext
* /Library/LaunchAgents/com.malwarebytes.mbam.frontend.agent.plist
* /Library/LaunchDaemons/com.malwarebytes.mbam.rtprotection.daemon.plist
* /Library/LaunchDaemons/com.malwarebytes.mbam.settings.daemon.plist
5. Restart your macOS.