CommonShare is a browser extension, plugin or addon for Google Chrome and Mozilla Firefox, also called a Browser Helper Object for Internet Explorer and is most likely responsible for the CommonShare advertisements. The CommonShare Advertisements are everywhere once you installed this CommonShare adware into your browser. CommonShare delivers Deals as Coupons for websites as Expedia, Amazon, Walmart, 1-800 Flowers and more. It does so by showing popups on the website you are visiting, or a “see similar” button. A large toolbar of some kind may also appear in your browser or a small ad appears showing you how many coupons there are available for that specific website with text “CommonShare ads” or “Powered by CommonShare“. This adware is spread thru different locations. You may be downloading it from there official site because it saves money while shopping online, or you may have got it bundled with some fake update or free download you installed on your computer.
This adware is made for one thing, and one thing only. To investigate your browsing behavior using domains as superfish.com to make money. Once you use a coupon that CommonShare delivers to you, CommonShare producers make money or at least benefit from it. When we got this installed on our honeypot we got it bundled with a Download Manager called Linkular.