A forum for reverse engineering, OS internals and malware analysis 

Forum for discussion about kernel-mode development.
 #28213  by Brock
 Wed Apr 06, 2016 2:04 am
That's because services.exe is considered a protected process on Windows 8.1 - Usermode processes will fail to acquire the needed handle access rights to the process. You can use NtSystemDebugControl() from usermode, IIRC it was brought back to life with some information classes on Windows 8/8.1, or simply do this from a driver.