So what does this experience look like? When you click on a UAC shielded control, your user desktop will appear to dim and the window that caused the elevation request – typically the window you were most recently using – and the elevation UI will be made more prominent. nothing running as the User’s privilege level) and the path to get to the Secure Desktop from the User Desktop must also be trusted through the entire chain. The Secure Desktop’s primary difference from the User Desktop is that only trusted processes running as SYSTEM are allowed to run here (i.e. MSDN has a more detailed explanation of Secure Desktop here: This can be quite dangerous as we will see. Now most people find this prompt annoying and will typically turn this off. Now what is Secure Desktop? From user experience side, Secure Desktop looks like this. For tasks which require privilege elevation, the administrator SID is used after the prompt on Secure Desktop has been clicked away. You cannot for example write to C:\Windows\System32 will get Access is denied error. Running cmd.exe from the Start menu without select ‘Run as administrator’ will give a shell without admin privileges. Windows implements UAC by using two separate SIDs even for administrator accounts. Elevate from High integrity cmd shell to SYSTEM.Elevate cmd shell from Medium to High integrity.
Specifically what must done are these steps, and in order. The shell belongs to the local Administrators group but UAC is enabled and needs to be bypassed, before we can elevate to SYSTEM. No exploitation needed because the machine already has a backdoor. Note: This is a rework of a lab that previously used Metasploit.
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