Shield Security - The most advanced and easy-to-use WordPress security plugin.
CWIS website antivirus - The Antivirus Scanner CWIS is a lightweight antivirus scanner application.
iThemes Security - Security plugin that provides over 30+ ways to secure and protect your WordPress site.
Sucuri - Website Protection, Malware Removal, and Blacklist Prevention
Defender - Encompassing security solution for WordPress.
WP Hacked Help - WP hacked help is a popular online Wordpress malware removal service.