CustomSearch is a questionable browser extension that has been classified as a browser hijacker. Applications of this type are typically used as a way to generate artificial traffic and promote a sponsored Web address. To achieve their purpose, browser hijackers may impact several, important browser settings, such as the homepage, new tab page, and the default search engine. However, an analysis of CustomSearch has confirmed that it modifies only the browser's default search engine.

To mask the change, the application will display the new address under the name of the legitimate Bing search engine in the affected browser's setting. In reality, whenever users initiate a search query via the URL tab of their browsers, it will instead be redirected to either or Both addresses are fake search engines that cannot produce results by themselves. After another redirect, users will be presented with results taken from Bing. However, the exact destination of the redirects may vary, based on certain factors - the user's IP address, geolocation and possibly others.

Adware, browser hijackers, and other PUPs (Potentially Unwanted Programs) also could carry additional, intrusive features. Many of these applications monitor the users' browsing activities and collect device details. The obtained information may regularly be transmitted to the operators of the specific PUP.

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