Install the fix malware problem Firewall Plugin. Stop and this plugin investigates net requests with simple heuristics to identify attacks that are most obvious.
After spending a couple of days and hitting a few spots around town, I eventually find a cafe that offers free, unsecured Wi-Fi and to my pleasure, there are tons of people sitting around each day connecting their laptops to the"free" Internet services. I sit down and use my handy dandy cracker tool and log into people's computers. Remember, they are all on a shared network.
Fortunately, keeping your WordPress site up-to-date is one of the simplest things you can do. For the last few versions, WordPress has blog included the ability to set up automatic updates. A new upgrade more tips here becomes available.
Imagine if you visit WP-Content/plugins, can you view that folder? If so, upload that blank Index.html file into that folder as well so people can not view what plugins you have. Someone can use that to get access because even if your current version of WordPress is current, if you're using a plugin or an old plugin using a security hole.
Implementing all of the above will probably take less than an hour to finish, while creating your WordPress website much more immune to basics intrusions. Over 1 million WordPress sites were cracked last year, largely due to easily preventable safety gaps. Have yourself prepared and you're likely to be on the safe side.