What is PUP.Optional.WinYahoo? PUP.Optional.WinYahoo is a specific detection used by antivirus software to detect a PUP (potentially unwanted program) from the category of browser hijackers. Once installed, this PUP will perform changes on web-browsers installed on infected computer. It can modify the user’s default homepage, new-tab page and search engine for their Chrome, Firefox, Edge
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