It seems that hacking has come out a lot lately. If you have a WordPress blog site, you may be affected.
However, it is your responsibility to make your site secure. Go one step further in security by just adding the plugin.
How the plugin works: If you use the wrong user ID and pass from the same IP more than once at the same time, it catches it, if you do it more than once, it blocks the IP. You can set the time of the IP block as you wish.
Click on the link below to download the plugin
Then properly install the plugin from the dashboard of your WordPress blog. Now enjoy complete protection from SQL injection.