Just found this alert on WPTavern:
Over the weekend, the security team at Sucuri discovered that more than 100,000 WordPress sites have been hit with the SoakSoak.ru malware campaign. This campaign has resulted in more than 11,000 domains being blacklisted by Google.
If your site or one of your clients’ sites is using the Slider Revolution plugin, it is imperative that you check to see if you are affected and update your site and plugins immediately.
More details here