Malware masquerading itself as an SEO plugin called WP-Base-SEO has infected close to 4,000 WordPress sites in the past three weeks. Studies show that a disproportionate number of infections are on WordPress installations running an outdated version of the WordPress slideshow plugin, RevSlider.
With an SEO plugin as a mask, the malware creates a back door to the targeted WordPress account. Let us know immediately if you need assistance with your outdated WP versions and plugins.