Most of the information in this article is general and I recommend heading to blogsecurity.net for up to date information on WordPress security.
Blogging is supposed to be fun but it isn’t always like that. If you are hosting your own blog there is a great chance that one day a hacker may decide to target your site.
As good as it is, WordPress still has security issues. Upgrading to the latest version is a must if you want to lower the risk of getting your site hacked.
Upgrading today is really easy, thanks to excellent plugins like Instant upgrade. You have no excuse not to upgrade.
Create empty index.html file (no content in it). Upload this file to your wp-content/plugins and wp-content/themes.
This will prevent anyone from looking over at what plugins and themes you have.
Edit your wp-config.php and change or create the SECRET_KEY definition. It should look something like this (alter the key value to your likening):
If you have access to your database, check the table wp_options and look for the record 'active_plugins'. It will list all really active plugins on your blog. Hacker may upload a file to your upload folder and activate it as a plugin so you want to make sure there are no alien plugins listed there.
Check your .htaccess file located in blog's root directory. Normally it should contain only references to index.php file for suspicious activity.
File change notifications
You can install file change notifications for your blog, sending you an email whenever one of your WordPress files on the server changes.
Install WordPress Exploit Scanner plugin. It scans through all files in your WordPress installation and searches for malicious looking code. You want to check if any of the warnings contain links to sites you are not familiar with.
If you are the only registered user of you WordPress blog, turning off “Anyone can register” option in your General settings of the Admin panel is a nice precaution as this was the source of biggest troubles in the past.
Should the trouble still happen, be sure you have at least weekly backups of your blog. WordPress Database Backup plugin will automate this work for you, so no reason not to use it.