See When admin is not admin? and more specifically, this code.
Code:
Break on
? "Priv       :  " + @priv
? "Admin Group:  "
if ingroup("\\" + @wksta + "\administrators")
  "True"
else
  "False"
endif
? "Local Admin:  "
if localadmin()
  "True"
else
  "False"
endif
 

function LocalAdmin()
 $LocalAdmin=ingroup('@wksta\'+sidtoname('S-1-5-32-544'))-1+@inwin
endfunction
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.