SpecialSearchOffer is a Google Chrome extension that modifies Chrome’s home page and search provider so that it uses Yahoo.com. When installed, SpecialSearchOffer will configure Chrome so that it automatically opens Yahoo.com as the home page and New Tab page. SpecialSearchOffer will also modify Chrome’s so that searches from the address bar will display search results from Yahoo.com. This is most likely done to generate revenue from advertisements displayed in the Yahoo search results.
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Source: Bleeping Virus