Microsoft Defender for Office 365’s New Language AI for Phish Model

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Microsoft has unveiled its advanced Language AI for Phish model in Defender for Office 365, designed to combat phishing attacks with unprecedented accuracy.

Key Features:

  • Progressive Learning: Analyzes thousands of real-world phishing attempts.
  • AI & NLP Integration: Uses Machine Learning (ML) and Natural Language Processing (NLP) to interpret emails like a human analyst.
  • High Accuracy: Achieves 99.99% detection accuracy since April 2025, blocking 1 million phishing emails daily.
  • Expanded Threat Coverage: Extends the same AI approach used for Business Email Compromise (BEC) to broader phishing attacks.

🔗 Blog Post: Microsoft Defender AI for Phishing

You Should Know:

How to Test Phishing Detection in Your Environment

1. Simulate Phishing Attacks (Using PowerShell):

 Generate a test phishing email 
Send-MailMessage -From "[email protected]" -To "[email protected]" -Subject "Urgent: Password Reset Required" -Body "Click here to reset: http://malicious.link" -SmtpServer "smtp.yourdomain.com"

– Monitor if Defender flags it.

2. Check Defender Logs:

 Retrieve phishing threat logs 
Get-MailDetailPhishReport -StartDate (Get-Date).AddDays(-1) -EndDate (Get-Date)

3. Enable Advanced AI Features:

 Ensure AI-based protection is enabled 
Set-AtpPolicyForO365 -EnableATPForPhish $true

Linux/Mac Alternative (for Security Testing)

  • Use GoPhish (Open-Source Phishing Framework): 
    Install GoPhish 
git clone https://github.com/gophish/gophish.git 
cd gophish 
go build 
./gophish
  • Analyze Defender’s response to GoPhish campaigns.

Verify AI Detection via API

 Query Defender for Office 365 detections (using Microsoft Graph API) 
curl -X GET "https://graph.microsoft.com/v1.0/security/threatAssessment/emailThreats" -H "Authorization: Bearer YOUR_ACCESS_TOKEN"

What Undercode Say

Microsoft’s AI-driven phishing detection is a game-changer, but manual verification remains crucial. Below are additional hardening commands:

Windows Defender Advanced Hardening

 Enable enhanced phishing protection 
Set-MpPreference -PhishProtectionEnabled $true

Linux Email Security (Postfix + ClamAV)

 Install ClamAV for email scanning 
sudo apt-get install clamav clamav-daemon 
sudo freshclam  Update virus DB

Office 365 Mail Flow Rule (Extra Protection)

New-TransportRule -Name "Block Suspicious Links" -SubjectOrBodyMatchesPattern "http://malicious.link" -DeleteMessage $true

AI Model Validation (Python Script)

import requests 
api_endpoint = "https://api.security.microsoft.com/phish-detection" 
headers = {"Authorization": "Bearer YOUR_API_KEY"} 
response = requests.get(api_endpoint, headers=headers) 
print(response.json())

Prediction

AI-powered phishing detection will soon integrate real-time behavioral analysis, reducing false positives further. Expect cross-platform AI threat intelligence (Windows/Linux/mobile) by 2026.

Expected Output:

  • Defender AI blocks phishing emails with >99.99% accuracy.
  • Security teams can automate threat hunting with PowerShell/Python.
  • Open-source tools (GoPhish) help test defenses.
  • Microsoft Graph API enables deep threat analytics.

References:

Reported By: Markolauren Were – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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