Directions.cm is a browser hijacker that will attempt to redirect your homepage to chrome-extension://bkcjncmijlkmlignahmdgbjldkmfiikg/newtab/blank.html and commandeer your default browser search engine to Yahoo. The virus will then display unwanted ads and sponsored links, send you to malicious websites to get money from you, collect your personal data, or infect your computer further. It may also prevent you from changing your settings back.
Directions.cm is usually installed through bundled software without the users knowledge. You have to remove it immediately.