Went running Rancher Desktop on Windows is SLE Micro running in WSL2? If not, what is running in WSL2?

Not sure what you are asking, but if you are talking about the

rancher-desktop

WSL2 distro, it is based on Alpine

I am trying to work out if I need to manage Linux WSL2. An immutable OS has fewer secure concerns.

The

rancher-desktop

VM is an implementation detail of Rancher Desktop; you should not touch it unless necessary to configure things not exposed via the UI.

Should not touch is different than cannot be touch. I am looking into how it could be exploited. Some malware are starting to target WSL and WSL2. So I may need to put some security controls to offset the additional risks.