PUP.Optional.Wajam is the detection name for Wajam, a browser add-on marketed as a “social search.”
PUP.Optional.SearchNet is the detection for a small family of Chrome extensions that hijack the user’s browser to direct him/her to a site called SearchNet.
Malwarebytes can remove the files associated with this potentially unwanted extension. You may have to remove the Extension manually under Tools > More Tools > Extensions. Click on the bin behind the name of the extension and confirm Remove in the prompt.