uTorrent - adware / malware on download and install - Mac OSX Yosemite

I recently downloaded uTorrent (for the more ethically concerned: to get a wikipedia data dump as the official download server kept terminating my download, not to rip off copyright holders...), and as soon as the installation had finished my browsers were suddenly using Yahoo instead of google as their default search engine.

I've changed it back to google in the browser settings, but I'm concerned it's done all sorts of other nasties. Can anyone help me

• Understand what I might have installed
• Get rid of anything bad

I downloaded my copy of uTorrent from http://www.utorrent.com/downloads/mac, and simply clicked through the installation wizard.

I would rather manually remove any suspect files/revert any changed settings than use a tool. But totally open to suggestions of good tools if other people have had success with them before.

Solution 1:

Try these:

• Edit your browser settings manually
• Reset your browser settings to the default
• Check if any new software is now available which you didn't explicitly install
• Uninstall the offending software and repeat the above
• Look through running processes and kill any suspects (Please be very careful here. If you don't know what you're doing, call an expert.)

As an extra tip: Kick the habit of clicking through installation wizards. Always scrutinize each step (except the License Agreement, of course* :P) and check if there are any default options you need to change. Common examples are "Install and try AwesomeCrapIDontNeed for 30 days!" and "Set AwesomeSearchIDontTrust as my default search engine".

^{* As @Doc explains, you should pay attention to the EULA you are agreeing to. Even if you're not going to read the entire legal mumbo-jumbo, at least give it a cursory glance to make sure the License Agreement is for the software you want to install, rather than something sneaky like Yahoo browser toolbar. If the EULA is for something unwanted, you are likely to find an option to disagree (and NOT install that) but continue with installation of the software you want.}