If you notice a big increase in the traffic to your website and in case after you look at the visitor stats it turns out that it comes from areas across the world or from other web servers, your site is more than likely being attacked by an automatic bot. Such pieces of software go through random websites aiming to log in to their administration area using a brute-force attack or to leave spam comments underneath any article where this type of an option is made available. Unfortunately, that's something relatively frequent these days, but if you know the IP addresses from which the attacks come, you could block them, so the bots shall not be able to access your site in any way. Needless to say, you may block IPs even if you allow only people from specific countries to access your website.
