Intune: Block Unauthorized Software Installations

Introduction

Managing software installations is a major security challenge in modern Windows environments. Installation programs frequently attempt to obtain elevated privileges, creating opportunities for the introduction of unauthorized software or malicious components.

Microsoft Intune enables organizations to deploy a strategy for detecting installation programs requiring privilege elevation, thereby transforming the installation process into a controlled and auditable mechanism.

Why This Strategy Is Essential

Risks of Uncontrolled Installations

In enterprise environments, the majority of users operate under standard accounts to minimize risks. However, many installers are designed to request dynamic privilege elevation.

Without appropriate controls:

• Installers can attempt privilege escalation
• Users may unknowingly approve risky prompts
• Silent installations introduce unapproved software
• System integrity can be compromised without centralized visibility

Benefits of Controlling Privileged Installations

Applying this strategy provides several advantages:

• Blocking unauthorized installations
• Controlling privilege escalation attempts
• Strengthening endpoint hardening
• Intentional and auditable administrative approval
• Reducing attack surface without impacting productivity

This approach supports least privilege, Zero Trust, and proactive endpoint governance strategies.

Technical Configuration via Windows Policy CSP

CSP Overview

This configuration uses the Windows Policy CSP framework and applies at the device level, ensuring consistent behavior regardless of the logged-in user.

Supported Editions:

• Windows 10 Pro, Enterprise, Education
• Windows 11 Pro, Enterprise, Education

Policy Properties

Allowed Values

• 1 (Enabled - Recommended): Windows actively detects installers requiring administrative privileges and blocks silent execution
• 0 (Disabled - Not Recommended): Installers can proceed without strict detection controls

Configuration Guide via Intune Settings Catalog

Creating the Configuration Profile

Configuring the Security Setting

Assignment and Deployment

Monitoring and Validating Deployment

Checking Status via Intune Console

To verify deployment results:

1. Navigate to Devices → Configuration profiles
2. Locate the created policy
3. Examine deployment metrics

Status Indicators:

• Succeeded: Policy applied successfully
• In progress: Processing ongoing or device not synced
• Error: Failure requiring investigation
• Not applicable: Device not compatible

Client-Side Verification via Event Viewer

For local validation on the target device:

PowerShell Scripts for Validation

Checking UAC Policy Status

1# Check UAC configuration for installation detection
2$regPath = "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System"
3$regName = "EnableInstallerDetection"
4 
5try {
6    $value = Get-ItemProperty -Path $regPath -Name $regName -ErrorAction Stop
7    if ($value.EnableInstallerDetection -eq 1) {
8        Write-Host "✓ Privileged installation detection: ENABLED" -ForegroundColor Green
9    } else {
10        Write-Host "✗ Privileged installation detection: DISABLED" -ForegroundColor Red
11    }
12} catch {
13    Write-Host "⚠ Unable to verify UAC configuration" -ForegroundColor Yellow
14}

Auditing Intune Synchronization Events

1# Search for recent Intune sync events
2$events = Get-WinEvent -FilterHashtable @{
3    LogName = 'Microsoft-Windows-DeviceManagement-Enterprise-Diagnostics-Provider/Admin'
4    ID = 813, 814
5    StartTime = (Get-Date).AddDays(-1)
6}
7 
8if ($events) {
9    Write-Host "Recent Intune synchronizations detected:" -ForegroundColor Cyan
10    $events | Select-Object TimeCreated, Id, LevelDisplayName | Format-Table -AutoSize
11} else {
12    Write-Host "No recent synchronization events found" -ForegroundColor Yellow
13}

Impact on Endpoint Security

Mitigated Attack Vectors

Uncontrolled application installation is one of the most common entry points for enterprise risks. Attackers frequently attempt to:

• Deliver malware disguised as legitimate installers
• Trigger elevation prompts to gain administrative access
• Deploy software silently via privilege escalation techniques
• Modify system components without centralized visibility

Strengthening Provided by the Strategy

By applying privileged installation detection:

• Intentional Control: Elevated installation activity becomes intentional and controlled
• Blocking Silent Attempts: Silent installation attempts are blocked
• Reducing Escalation Vectors: Privilege escalation vectors are reduced
• Mandatory Administrative Approval: Administrative approval becomes mandatory
• Enforcing Least Privilege: The principle of least privilege is enforced at the operating system level

Technical Terms Glossary

CSP (Configuration Service Provider): Programmatic interface enabling Windows settings configuration through MDM solutions like Intune.

Settings Catalog: Modern Intune interface enabling granular configuration of Windows settings through a CSP-based approach.

UAC (User Account Control): Windows security feature that requests confirmation or credentials before authorizing actions requiring administrative privileges.

Privilege Escalation: Process by which a user or application obtains access rights superior to those normally granted.

Event ID 813/814: Windows event identifiers indicating successful processing of MDM configuration policies.

Useful Links and Official Documentation

Intune Configuration and Policies

• Create a policy with Settings Catalog - Detailed guide for creating and managing Settings Catalog policies
• Device configuration profiles in Intune - Overview of how configuration profiles work

Windows Security Settings and CSP Reference

• User Account Control (UAC) Settings and Configuration - Official Windows documentation on UAC policies
• Policy CSP - LocalPoliciesSecurityOptions - Complete technical reference of security settings

Policy Monitoring and Troubleshooting

• View device configuration policies with Microsoft Intune - Guide for verifying assignment status and interpreting deployment reports
• Troubleshoot policies and profiles in Microsoft Intune - Tips for resolving common policy application issues