detecting-spearphishing-with-email-gateway

name	detecting-spearphishing-with-email-gateway
description	Spearphishing targets specific individuals using personalized, researched content that bypasses generic spam filters. Email security gateways (SEGs) like Microsoft Defender for Office 365, Proofpoint,
domain	cybersecurity
subdomain	phishing-defense
tags	["phishing","email-security","social-engineering","dmarc","awareness","spearphishing","email-gateway"]
version	1.0
author	mahipal
license	Apache-2.0
nist_csf	["PR.AT-01","DE.CM-09","RS.CO-02","DE.AE-02"]
mitre_attack	["T1566.001","T1566.002","T1204.001","T1204.002"]
source	https://github.com/mukul975/Anthropic-Cybersecurity-Skills
source_commit	04450304b12645cb2b974ab96d28c0664758a88d

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
• Understanding of email flow architecture (MX records, transport rules)
• Familiarity with SPF/DKIM/DMARC authentication
• Knowledge of common spearphishing techniques and pretexts

Key Concepts

Spearphishing Characteristics

• Targeted recipients: Specific individuals, often executives or finance staff
• Researched pretexts: References to real projects, colleagues, or events
• Impersonation: Spoofs trusted senders (CEO, vendor, partner)
• Low volume: Few emails to avoid pattern-based detection
• Urgent tone: Creates pressure to act quickly

Gateway Detection Layers

1. Reputation filtering: IP/domain/URL reputation scoring
2. Authentication checks: SPF, DKIM, DMARC validation
3. Content analysis: NLP-based analysis of email body
4. Impersonation detection: Display name and domain similarity matching
5. URL analysis: Real-time URL detonation and redirect following
6. Attachment sandboxing: Behavioral analysis of attachments in isolated environments
7. Behavioral analytics: Anomaly detection in communication patterns

Workflow

Step 1: Configure Impersonation Protection

Microsoft Defender for Office 365:
  Security > Anti-phishing policies > Impersonation settings
  - Enable user impersonation protection for VIPs
  - Enable domain impersonation protection
  - Add protected users (CEO, CFO, HR Director)
  - Set action: Quarantine message

Proofpoint:
  Email Protection > Impostor Classifier
  - Enable display name spoofing detection
  - Configure lookalike domain detection
  - Set Impostor threshold sensitivity