suspicious boolean.php file in wp web root [closed]

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You need to secure your WordPress install. Start by removing this file and any other suspicious files, then running a reinstall via the backend.

Run a plugin such as this as a guide to see which themes and plugins may be secure:

http://ocaoimh.ie/exploit-scanner/

Also make sure all other WordPress installs on the server are similarly secure.

For more details on securing your WordPress install, you can search this site and elsewhere, WordPress security is a heavily documented subject.