As we will see, in order to be able to use this trick, a specifcally crafted DLL must be planted into the C:\Windows\System32\ folder first, which only “privileged accounts” can do of course. I want to begin this article by clarifying a few things. Here, I want to share an alternative method I found while looking for DLL hijacking weaknesses on the most recent version of Windows. Andrea Pierini (aka mentionned this briefly on Twitter. Unfortunately (or fortunately depending on your point of view), this method was mitigated by Microsoft in Windows 10 build 1903. Whenever you found an arbitrary file write as SYSTEM in Windows or in some third-party software, you could use this trick to get code execution on demand, and without rebooting. The DiagHub DLL loading technique found by James Forshaw (a.k.a. PS C:\Users\itm4n> _ Weaponizing Privileged File Writes with the USO Service - Part 1/2 August 17, 2019
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