Botnet attacks against WordPress

Attackers are directing botnets at WordPress sites, trying to guess their admin passwords. I recommend not using “admin” as your administrator name, making sure you have very strong passwords, and use the Limit Login Attempts plugin.

http://techcrunch.com/2013/04/12/hackers-point-large-botnet-at-wordpress-sites-to-steal-admin-passwords-and-gain-server-access/

http://wordpress.org/extend/plugins/limit-login-attempts/