Hunting ClickFix Initial Access Techniques

“ClickFix is an initial access technique first observed in early 2024. It involves social engineering users into copying, pasting, and executing malicious code via the Windows Run dialog.”

You Should Know:

ClickFix is a social engineering attack that exploits the Windows Run dialog to execute malicious code. Attackers trick users into copying and pasting commands that can lead to system compromise. Below are practical steps, commands, and detection techniques to mitigate this threat.

Detection and Mitigation Steps

1. Monitor Windows Run Dialog Usage:

• Use Windows Event Logs to monitor the execution of commands via the Run dialog.
• Look for suspicious commands or scripts executed via Win + R.

KQL Query for Microsoft Sentinel:

SecurityEvent
| where EventID == 4688
| where ProcessCommandLine contains "cmd.exe" or ProcessCommandLine contains "powershell.exe"
| where ProcessCommandLine contains "Run dialog"
| project TimeGenerated, Computer, AccountName, ProcessCommandLine

2. Restrict Run Dialog Usage:

• Use Group Policy to restrict access to the Run dialog for non-admin users.
• Navigate to `gpedit.msc` > User Configuration > Administrative Templates > Start Menu and Taskbar > Remove Run menu from Start Menu.

3. Enable Windows Defender Attack Surface Reduction (ASR):

• Enable ASR rules to block malicious scripts and executables.
• Use the following PowerShell command to enable ASR:

  Set-MpPreference -AttackSurfaceReductionRules_Ids <RuleID> -AttackSurfaceReductionRules_Actions Enabled
  

4. Educate Users:

• Train users to avoid executing unknown commands or scripts.
• Conduct phishing simulations to raise awareness.

5. Implement Application Whitelisting:

• Use tools like AppLocker or Windows Defender Application Control (WDAC) to restrict unauthorized applications.
• Example AppLocker rule:

  New-AppLockerPolicy -RuleType Script -User Everyone -Path "C:\Windows\System32\cmd.exe" -Action Deny
  

6. Monitor PowerShell Activity:

• Enable PowerShell logging and monitor for suspicious activity.
• Use the following command to enable script block logging:

  Set-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows\PowerShell" -Name "EnableScriptBlockLogging" -Value 1
  

7. Deploy Endpoint Detection and Response (EDR):

• Use EDR solutions to detect and respond to malicious activities in real-time.

Linux Commands for Threat Hunting

• Monitor Process Execution:

  ps aux | grep -E 'cmd.exe|powershell.exe'
  

• Check for Suspicious Cron Jobs:

  crontab -l
  

• Analyze Network Connections:

  netstat -tuln
  

• Search for Malicious Files:

  find / -name "*.sh" -exec grep -l "malicious_pattern" {} \;
  

What Undercode Say

ClickFix is a sophisticated technique that leverages social engineering to compromise systems. By combining user education, robust monitoring, and strict access controls, organizations can significantly reduce the risk of such attacks. Implementing advanced detection mechanisms like KQL queries, PowerShell logging, and EDR solutions ensures proactive threat hunting and response.

Expected Output:

• Enhanced detection of ClickFix attacks using KQL and PowerShell logging.
• Reduced risk of initial access through social engineering.
• Improved endpoint security with ASR and application whitelisting.

URLs:

• Hunting ClickFix Initial Access Techniques

References:

Reported By: Inode Kql – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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