Interestingly, the server mapped to kneeexercises[.]net listens for incoming HTTPS connections on several ports and uses common names seen on other C2 domains. For example, ports 2083 and 8443 had CN firstohiobank[.]com, and TCP port 2087 had a TLS certificate with the common name dentalmatrix[.]net. We observed use of these non-standard ports during some of the older intrusions, while the newer ones mostly use port 443