WordPress is a pretty secure platform but you will still have to harden your themes, plugins, and server to stop any potential hack attack. We have already covered a bunch of plugins that let you do just that. NinjaScanner can also prove helpful. It scans your blog for malware and viruses (the premium version can schedule scans).
NinjaScanner can perform incremental scans. With its file integrity checker, you can compare your WordPress core files and plugins to their original package to see the differences. NinjaScanner can also track files and database changed since the previous scan.
NinjaScanner can use a sandbox for quarantined files to make sure you don’t break your site accidentally. Want to scan files smaller than a certain size or ignore certain file extensions? No problem. You can try this plugin for free.