The rise in hacker attempts is at an all time high.
To have peace of mind we recommend using Brute Force Stop.
You can find it here --> http://extensions.joomla.org/extensions/access-a-security/site-security/login-protection/22982
This is only available for Joomla 2.5 and higher.
Once installed you would be amazed at how many are trying to hack in.
I suggest you set the email notify to a high number so you don't get an endless stream of email warnings.
You can set the app to white list your IP if you have a static IP.
If you don't have a static IP do not try to set this for your IP.
If you have Joomla installed this is a must have application to add to it.
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CW3 Web Hosting