Individual skill
detecting-spearphishing-with-email-gateway
Detect and block spearphishing emails that use personalized, researched content to evade generic spam filters, by configuring email security gateway (SEG) impersonation protection, URL rewriting, attachment sandboxing, and custom detection rules in Microsoft Defender for Office 365, Proofpoint, Mimecast, or Barracuda. Use when hardening a mail gateway against targeted phishing or investigating a suspected spearphishing campaign.
skills/detecting-spearphishing-with-email-gateway/SKILL.md
Source commit 54a798831d2266a3ca61ce68a7acb80b81160d57
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- Observed behavior
- Local scripts
- Last checked
- Nov 9, 2026
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Repository context
- Repository stars (not skill ratings)
- 35,918
- Repository last updated
- Aug 31, 2026
- License
- Apache-2.0
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- ai-agents Repository topic
- claude-code Repository topic
- cybersecurity Repository topic
- incident-response Repository topic
- mitre-attack Repository topic
- penetration-testing Repository topic
- red-team Repository topic
- security Repository topic
- cloud-security Repository topic
- malware-analysis Repository topic
- phishing Declared skill tag
- email-security Declared skill tag
- social-engineering Declared skill tag
- dmarc Declared skill tag
- awareness Declared skill tag
- spearphishing Declared skill tag
- email-gateway Declared skill tag
- engineering Derived category
- marketing Derived category
- writing Derived category
- security Derived category
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LICENSEasset · 11,255 bytesSKILL.mdcore · 5,551 bytesassets/template.mddoc · 1,928 bytesreferences/api-reference.mddoc · 2,296 bytesreferences/standards.mddoc · 2,489 bytesreferences/workflows.mddoc · 3,813 bytesscripts/agent.pyruns · 5,768 bytesscripts/process.pyruns · 21,603 bytes
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# Detecting Spearphishing with Email Gateway
## Overview
Spearphishing targets specific individuals using personalized, researched content that bypasses generic spam filters. Email security gateways (SEGs) like Microsoft Defender for Office 365, Proofpoint, Mimecast, and Barracuda provide advanced detection capabilities including behavioral analysis, URL detonation, attachment sandboxing, and impersonation detection. This skill covers configuring these gateways to detect and block targeted phishing attacks.
## When to Use
- When investigating security incidents that require detecting spearphishing with email gateway
- When building detection rules or threat hunting queries for this domain
- When SOC analysts need structured procedures for this analysis type
- When validating security monitoring coverage for related attack techniques
## Prerequisites
- Access to email security gateway admin console