So, I just got my new 5k iMac and have been playing around with different things. One of them is openemu. Some of the zipped emulator games need 7-zip to unzip them, so I downloaded it and installed it. Apparently it had at least two forms of malware embedded in it (at least the download I used). The first was "Premier Opinion", which is a fairly nasty piece of spyware that I appear to have removed through both simply deleting it and its Launch Agent lines, and using Malwarebytes. The second however is a browser hijacker, that managed to hijack Safari/Firefox/Chrome simultaneously with an obviously nefarious search engine "search.lexside.com". I've deleted it manually from Safari and Firefox, and tried from Chrome, but it keeps coming back. My plan when I get home and get a chance is to try Sophos (just learned about it) and AdwareMedic to see if they fix the problem. Malwarebytes didn't. I also found this on Apple Support that I will try if those don't work: https://support.apple.com/en-il/HT203987 Anyway, if those don't work I don't know what to do. Anybody run into this one or have any ideas for solutions? Running the latest version of Yosemite.