User Account Control

Configure Windows User Account Control to mitigate risk of adversaries obtaining elevated process access.

ID: M1052
Version: 1.1
Created: 11 June 2019
Last Modified: 31 March 2020

Techniques Addressed by Mitigation

Domain ID Name Use
Enterprise T1548 Abuse Elevation Control Mechanism

Although UAC bypass techniques exist, it is still prudent to use the highest enforcement level for UAC when possible and mitigate bypass opportunities that exist with techniques such as DLL Search Order Hijacking.

.002 Bypass User Access Control

Although UAC bypass techniques exist, it is still prudent to use the highest enforcement level for UAC when possible and mitigate bypass opportunities that exist with techniques such as DLL Search Order Hijacking.

Enterprise T1546 .011 Event Triggered Execution: Application Shimming

Changing UAC settings to "Always Notify" will give the user more visibility when UAC elevation is requested, however, this option will not be popular among users due to the constant UAC interruptions.

Enterprise T1574 Hijack Execution Flow

Turn off UAC's privilege elevation for standard users [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System] to automatically deny elevation requests, add: "ConsentPromptBehaviorUser"=dword:00000000. Consider enabling installer detection for all users by adding: "EnableInstallerDetection"=dword:00000001. This will prompt for a password for installation and also log the attempt. To disable installer detection, instead add: "EnableInstallerDetection"=dword:00000000. This may prevent potential elevation of privileges through exploitation during the process of UAC detecting the installer, but will allow the installation process to continue without being logged. [2]

.010 Services File Permissions Weakness

Turn off UAC's privilege elevation for standard users [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System]to automatically deny elevation requests, add: "ConsentPromptBehaviorUser"=dword:00000000. Consider enabling installer detection for all users by adding: "EnableInstallerDetection"=dword:00000001. This will prompt for a password for installation and also log the attempt. To disable installer detection, instead add: "EnableInstallerDetection"=dword:00000000. This may prevent potential elevation of privileges through exploitation during the process of UAC detecting the installer, but will allow the installation process to continue without being logged.[2]

.005 Executable Installer File Permissions Weakness

Turn off UAC's privilege elevation for standard users [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System] to automatically deny elevation requests, add: "ConsentPromptBehaviorUser"=dword:00000000. Consider enabling installer detection for all users by adding: "EnableInstallerDetection"=dword:00000001. This will prompt for a password for installation and also log the attempt. To disable installer detection, instead add: "EnableInstallerDetection"=dword:00000000. This may prevent potential elevation of privileges through exploitation during the process of UAC detecting the installer, but will allow the installation process to continue without being logged. [2]

Enterprise T1199 Trusted Relationship

Properly manage accounts and permissions used by parties in trusted relationships to minimize potential abuse by the party and if the party is compromised by an adversary.

Enterprise T1550 .002 Use Alternate Authentication Material: Pass the Hash

Enable pass the hash mitigations to apply UAC restrictions to local accounts on network logon. The associated Registry key is located HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\LocalAccountTokenFilterPolicy.

Through GPO: Computer Configuration > [Policies] > Administrative Templates > SCM: Pass the Hash Mitigations: Apply UAC restrictions to local accounts on network logons.[1]

References