AntiVirus

It is kind of an anti-virus for WordPress.

Installation:

Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.

Features:

• WordPress 2.9.x ready
• Detect the current WordPress permalink back door
• Quick & Dirty: activate, check, done!
• Manual testing with immediate result of the infected files
• Daily automatic check with email notification
• Whitelist: Mark the suspicion as "No virus"
• English, German, Italian, Persian

What is new in this release:

• Detection and warning for the MailPoet vulnerability.

What is new in version 1.3.7:

• Updated the Google Safe Browsing Lookup API to v3.1.

What is new in version 1.3.6:

• Code revision and data validation.

What is new in version 1.3.5:

• Optimizations for WordPress 3.8.

What is new in version 1.3.4:

• Google Safe Browsing for malware and phishing monitoring.

What is new in version 1.3.3:

• Add inspection for iFrames.
• Retina support for teaser and screenshot.

What is new in version 1.3.2:

• Remove the check for include and require commands (#wpforce).

What is new in version 1.3.1:

• Compatibility with WordPress 3.4
• High-resolution plugin icon for retina displays
• Remove icon from the admin sidebar

What is new in version 1.2:

• "Virus suspected" alert in the admin bar.
• Fix for the manual scan link on dashboard.
• More detailed checks for existing malware.
• Code adjustments for WordPress 3.3.

Requirements:

• WordPress 2.8 or higher
• PHP 5.1 or higher