In case you notice a considerable increase in the traffic to your site and in case after you look into the visitor stats it turns out that it comes from areas around the world or from other servers, your website is probably being attacked by an automatic bot. Those programs go through random sites seeking to log in to their administrator area through a brute-force attack or to leave spam comments below any article where such an option is made available. Unfortunately, that's something quite common these days, but if you know the IP addresses from which the attacks come, you can block them, so the bots will not be able to access your Internet site in any way. Certainly, you'll be able to block IPs even if you allow only people from specific countries to access your website.