Mao1.club is a browser hijacker that will attempt to commandeer your browser search and homepage to https://mao1.club/results.php?wd={search_Terms}. The search results will send you to malicious websites to get money from you or infect your computer further. It may also prevent you from changing your settings back.
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Mao1.club is usually installed through bundled software without you knowing. Remove it immediately.