Safari on my Mac, has been affected by the Search Marquis malware. How can I get rid of it?

Safari on my Mac, has been affected by the Search Marquis malware.

I’ve watched a few videos on YouTube, about trying to get rid of it, but they seem to be presented by guys trying to sell different versions of software. (E.g. CleanMyMac X), then when I read the comments below the videos, some people are commenting that the software doesn’t get rid of Search Marquis.

I’ve tried the manual method described in the videos…. Emptied Caches; Cleared all Cookies; Cleared all History…. I can’t find anything in Library that looks suspicious, and nothing at all in Extensions.

The final step says to open Activity Monitor, and Stop any startup activities that look suspicious, but doesn’t give any examples, so it’s no help whatsoever.

Does anyone know how to get rid of this malware from a Mac?