We read reports that old versions of the RevSlider plugin are making victims even today, few months after the vulnerability was reported. If you use RevSlider plugin (some themes might have it included) make sure you run the latest version or at least install this Revolution Slider plugin patch.
If your web site was hacked or you don’t trust it, you should ask a WordPress pro to check your web site since the infection can be very complex.
The same if you are using Showbiz Pro version 1.7.1 or older. Update here.
More info
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