OSX/GenieoDropper is the Genieo component responsible for dropping and installing many variants of Potentially Unwanted Programs (PUPs)/Adware, often in the form of a browser hijacker [1], developed by an Israeli company Genieo Innovation [2].

References:

1. http://www.thesafemac.com/tag/genieo/
2. https://en.wikipedia.org/wiki/Genieo