An ongoing brute-force attack on WordPress-based websites has compromised more than 90,000 blogs, but there are simple ways to make sure your blog won't be next to fall.
Brute-force attacks, as their name would suggest, are some of the least sophisticated hacks out there, rapidly cycling through common directory names, passwords and IP addresses in order to access private files through sheer dumb luck.
The bad news is that such attacks happen to WordPress blogs tens of thousands of times per day; the good news is that stopping them cold is simplicity itself.
Read more at: http://mashable.com/2013/04/18/protect-wordpress-from-attack/