wp.getUsersBlogs XMLRPC Brute Force Attack/Vulnerability

This is the most specific solution I could find as it disables only the single function being attacked.

functions.php:

function Remove_Unneeded_XMLRPC( $methods ) {
    unset( $methods['wp.getUsersBlogs'] );
    return $methods;
}
add_filter( 'xmlrpc_methods', 'Remove_Unneeded_XMLRPC' );

found this at: http://www.cryptobells.com/more-wordpress-xmlrpc-brute-force-attacks/

For a broader solution there is a WordPress plugin called “Disable XML-RPC” which does precisely that, disables the entire XML-RPC functionality.