Roboto is a new peer-to-peer (P2P) botnet dubbed Roboto by security researchers at 360 Netlab. Roboto exploits a Webmin RCE vulnerability tracked as CVE-2019-15107 to drop its downloader module on Linux servers running vulnerable installations of Unix Webmin web-based system administration tool. Not even a single Roboto DDoS attack was detected since they started tracking the botnet three months ago. P2P botnets are known to be resilient against sinkholing attacks, but there are examples such as the Kelihos and ZeroAccess botnets that are vulnerable.
Source: https://www.bleepingcomputer.com/news/security/linux-webmin-servers-being-attacked-by-new-p2p-roboto-botnet/