MDEAutomator – ActionManager: Canceling Pending Jobs in Microsoft Defender for Endpoints

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Since somebody talked me into surfacing the “Send to all Devices” button, this seems like an appropriate time to introduce ActionManager. If you have ever sent the correct script to all of the endpoints of the wrong TenantId, it’s a stressful experience. MDEAutomator hits fast—it can execute on 40-50 endpoints before you realize the mistake.

Repo: MDEAutomator GitHub

You Should Know:

1. How to Cancel Pending Jobs Using ActionManager

If you accidentally deploy a script to the wrong tenant or devices, follow these steps to mitigate the issue:

1. Access ActionManager:

  • Navigate to the MDEAutomator dashboard.
  • Locate the ActionManager section.

2. Cancel All Pending Jobs:

  • Click the “Big Red Button” (emergency stop).
  • Verify cancellation via PowerShell: 
    Get-MdeAutomatorJob -Status "Pending" | Stop-MdeAutomatorJob -Force

3. Audit Affected Devices:

Get-MdeMachineAction -Status "Pending" | Export-Csv -Path "PendingActions.csv"

2. Preventing Future Mistakes

  • Tenant Validation Before Execution: 
    $CurrentTenant = Get-MdeTenantId 
if ($TargetTenant -ne $CurrentTenant) { Throw "Wrong Tenant!" }

  • Use Dry-Run Mode: 

    Invoke-MdeAutomatorScript -ScriptPath "deploy.ps1" -DryRun

3. Linux Equivalent for Security Automation

For Linux-based EDR solutions (e.g., CrowdStrike, SentinelOne), use:

 List pending actions 
falconctl -l --actions | grep "pending"

Cancel actions 
falconctl -x --action-id <ID>

What Undercode Say

MDEAutomator’s ActionManager is a critical failsafe for SecOps teams. The ability to halt unintended scripts mid-execution prevents widespread misconfigurations. Always:
– Test in isolation (e.g., a single device group).
– Log actions for audit trails.
– Automate checks (e.g., tenant-ID verification).

For advanced users, integrate with SIEMs (e.g., Splunk, Azure Sentinel) to trigger alerts on mass deployments: 

SecurityAlert | where ActionType == "ScriptExecution" | summarize count() by TargetDevice

Prediction

As cloud-based endpoint management grows, expect more tools to adopt real-time rollback features. AI-driven anomaly detection (e.g., “unusual script deployment patterns”) will become standard in EDR platforms.

Expected Output:

  • Cancelled pending jobs.
  • Audit log (PendingActions.csv).
  • Dry-run validation before execution.

IT/Security Reporter URL:

Reported By: Emannon Mdeautomator – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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