While I'm here, does anyone know of a good trustworthy RAT for Windows machines that I can control from my Linux box? I have some relatives for whom I provide technical support. I'd love to just put an EXE on their desktop that would launch a VNC session and connect back to me (since they have the typical NAT + firewall of home users), but I don't want to install a virus on their machines.
Not sure what your decision procedure is for "a virus" versus "trustworthy RAT", but there are plenty of open source options out there, in case that helps,
https://medevel.com/18-os-rat-list/
OpenVPN, IPSEC, Wireguard can all be used to tether them to you. If you don't have a static IP then a dynamic DNS service can fix that. Once you have a VPN then use whatever you fancy - RDP for example.
AFAIK, solutions like TeamViewer or AnyDesk may be securely connected from the outside and manage the NAT+firewall of home user... no need to have a RAT (in the "virus/backdoor" meaning)
Put Tailscale on their machines and use a normal remote desktop application (probably the built-in RDP). Or put a RaspberryPi with Tailscale on their network.
Just make sure you set the key for those clients to not expire.
