Analytics Spam Killer makes it very easy to exclude spam referring domains from Google Analytics by automatically inserting filters that take care of them.

{"cookieName":"wBounce","isAggressive":false,"isSitewide":true,"hesitation":"","openAnimation":false,"exitAnimation":false,"timer":"","sensitivity":"","cookieExpire":"15","cookieDomain":"","autoFire":"","isAnalyticsEnabled":false}