There is a host that has appeared in my list that does not belong to me. What should I do?
The most likely explanation is that an antivirus program uploaded the secteerSetup.msi file and a researcher at that antivirus company installed the program. You can safely hide the agent in the interface.
It’s important to note that the MSI file you have received is keyed to your account, so anyone who receives it can run it, and the resulting agent will also be keyed to your account. There is no security issue here because the agent doesn’t receive any significant information from the server.