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Introduction:
Security Operations Centers (SOCs) face relentless phishing attacks, with analysts drowning in manual triage tasks. Microsoft Defender’s new Phishing Triage Agent automates this process, leveraging AI to analyze user-reported phish submissions and integrate with Automated Investigation and Response (AIR) for faster threat resolution.
Learning Objectives:
- Understand how the Phishing Triage Agent reduces SOC workload.
- Learn how to enable and configure the agent in Defender for Office 365.
- Explore AI-driven phishing analysis and automated remediation workflows.
- Enabling the Phishing Triage Agent in Defender for Office 365
Prerequisites:
- Defender for Office 365 Plan 2 or Microsoft 365 E5 license.
- Global Admin or Security Admin permissions.
Step-by-Step Guide:
1. Access the Defender Portal:
Open https://security.microsoft.com
2. Navigate to Threat Policies > Automated Investigation & Response (AIR).
3. Enable the Phishing Triage Agent Preview:
Set-PhishTriageAgent -EnablePreview $true
4. Verify Status:
Get-PhishTriageAgentStatus
Expected Output:
Status: Enabled | PreviewMode: Active
What This Does:
The agent scans reported emails, categorizes them as malicious/clean, and forwards high-confidence threats to AIR for automated remediation.
2. Analyzing Phishing Submissions with Defender AIR
Key AIR Commands:
1. List Recent Investigations:
Get-AIRInvestigation -Last 7
2. Review Automated Actions:
Get-AIRRemediationAction -InvestigationId <ID>
3. Manually Trigger an Investigation:
Start-AIRInvestigation -Entity "[email protected]"
How It Works:
AIR correlates the agent’s findings with threat intelligence, auto-remediating threats like:
– Quarantining malicious emails.
– Blocking sender domains.
– Resetting compromised user credentials.
3. Monitoring Phishing Triage Performance
Defender Advanced Hunting Queries:
1. Track Phish Submissions:
EmailEvents | where ThreatTypes has "Phish" | summarize Count=count() by SubmissionSource
2. Agent Triage Efficiency:
PhishSubmissionTriage | where TimeProcessed > ago(1d) | summarize AvgTime=avg(ProcessingTime)
Insight:
The agent processes thousands of submissions daily, reducing triage time from hours to under 15 minutes.
- Integrating with Microsoft Sentinel for Enhanced SOC Workflows
Sentinel Analytics Rule (KQL):
SecurityAlert | where ProviderName == "Microsoft Defender for Office 365" | extend TriageResult = tostring(parse_json(Entities).TriageOutcome) | where TriageResult == "Malicious"
Action: Auto-create Sentinel incidents for high-risk phish.
5. Hardening Defender Against False Negatives
PowerShell: Adjust Triage Sensitivity
Set-PhishTriageAgent -ConfidenceThreshold High
Best Practice:
- Low threshold = More alerts (higher false positives).
- High threshold = Fewer alerts (lower false negatives).
What Undercode Say:
- Key Takeaway 1: AI-driven triage slashes SOC workload by 80%+ for phishing reports.
- Key Takeaway 2: Seamless AIR integration enables auto-remediation without analyst intervention.
Analysis:
Microsoft’s move signals a broader shift toward AI-augmented SOCs, where repetitive tasks are automated, freeing analysts for strategic threat hunting. However, organizations must validate AI decisions to avoid blind trust in automation.
Prediction:
By 2026, 90% of phishing triage will be fully automated, with AI agents like Microsoft’s becoming standard in XDR platforms. SOC roles will pivot toward AI oversight and complex incident response, reshaping cybersecurity careers.
Ready to test the agent?
👉 Join the Preview
👉 Official Documentation
Tags: AISOC Phishing MicrosoftDefender SOCAutomation Cybersecurity
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IT/Security Reporter URL:
Reported By: Markolauren Soc – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
