What role does MF.dll play in Remote Desktop attacks, and when is it particularly useful?

MF.dll is loaded by the system when a user initiates a Remote Desktop connection (if Remote Desktop is enabled). An attacker can place a malicious `C:\Windows\System32\MF.dll` and wait for any user to connect via RDP, at which point the DLL is executed. This technique is particularly useful for domain controllers: if you have remote file access but cannot execute commands, writing MF.dll gives you code execution the moment an administrator or user connects via RDP. This method is covered in the Expansion on the Exploitation of "Lateral Movement — SCM and DLL Hijacking Primer".