A massive malware campaign designed to target open Redis servers, about which researchers warned almost two months ago, has now grown and already hijacked at least 75% of the total servers running publicly accessible Redis instances. Redis is an open source, widely popular data structure tool that can be used as an in-memory distributed database, message broker or cache. Since it is designed to be accessed inside trusted environments, it should not be exposed on the Internet. Administrators are advised never to expose their servers to the Internet, but if required, apply authentication mechanism to prevent unauthorized access.
Source: https://thehackernews.com/2018/06/redis-server-hacking.html