This indicates that SUNBURST Backdoor C2 communication was detected in the network.
SolarWinds Orion Platform versions 2019.4 HF 5, 2020.2 with no hotfix installed, or with 2020.2 HF 1
System Compromise: Remote attackers can gain control of vulnerable systems.
This signature's action can be set to "Block" to block this application.
Please use Anti-Virus software to scan and clean the system.
Also follow the latest advisory from the vendor.