How to remove Search.searchlttrnow.com (Windows and Mac)

Search.searchlttrnow.com is a malicious domain under the guise of search engine that affects all popular browsers including Chrome, Safari, Firefox, Edge, and IE. Many computer experts classify Search.searchlttrnow.com as a browser hijacker due to ability to forcibly modify browser settings. Once installed, program sets http://search.searchlttrnow.com/ as new default search engine as well as injects its own bothersome advertisement that will show up on every page you visit.