I've had two WordPress blogs hacked into previously. That was at a time when I was doing virtually no internet marketing, and until I found time to deal with the situation (weeks later), these sites were penalized in the main search engines. They were not eliminated, however the ratings were reduced.
Finally, repair hacked wordpress site will inform you that there's not any htaccess inside the directory. You may place a.htaccess record into this directory if you would like, and you can use it to handle this wp-admin directory from Ip Address address or address range. Details of how you can do this are plentiful around the internet.
A simple way to maintain WordPress safe is to use a few built-in tools. To begin with, don't allow people to list the files in your folders, run a web host security scan and automatically backup your whole web hosting account.
Harness Scanner goes in search of anything suspicious through the files on your site comment database and place tables. It informs you for plugin names that are unusual. It does not remove anything, it warns you.
Another step to take to make WordPress more secure is to always upgrade WordPress. The main reason behind this is that there also come fixes for page security holes that are older which makes it essential to look these up update.
Just make sure you choose a plugin that is current with release and the current version of WordPress, and that you can schedule, restore and replicate.