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59 lines
1.9 KiB
Markdown
59 lines
1.9 KiB
Markdown
# Email Gateway Spearphishing Detection Configuration Template
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## Gateway Information
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- **Product**: [Microsoft Defender for O365 / Proofpoint / Mimecast / Barracuda]
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- **Version**: []
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- **Configuration Date**: [YYYY-MM-DD]
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- **Configured By**: []
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## VIP Protection List
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| Name | Title | Email | Risk Level |
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|---|---|---|---|
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| | CEO | | Critical |
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| | CFO | | Critical |
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| | CTO | | Critical |
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| | VP Finance | | High |
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| | HR Director | | High |
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## Impersonation Detection Rules
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| Rule | Trigger | Action | Severity |
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|---|---|---|---|
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| VIP display name match | External email with VIP name | Quarantine + Alert | Critical |
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| Lookalike domain | Levenshtein distance <= 2 | Quarantine | High |
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| First-time sender to VIP | No prior communication | Tag warning | Medium |
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| Reply-to mismatch | Reply-to differs from From | Tag + Log | Medium |
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## URL Protection Settings
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| Setting | Value |
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|---|---|
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| URL rewriting enabled | Yes |
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| Time-of-click verification | Yes |
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| Block new domains (< days) | 30 |
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| Follow redirects | Yes (max 5 hops) |
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| Detonate suspicious URLs | Yes |
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## Attachment Protection Settings
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| Setting | Value |
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| Sandbox detonation | Enabled |
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| Dynamic delivery | Enabled |
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| Block macros from external | Yes |
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| Block executable types | .exe, .scr, .bat, .cmd, .ps1, .vbs, .js |
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## Alert Configuration
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| Event | Alert Method | Recipients |
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|---|---|---|
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| VIP impersonation detected | Email + SIEM | SOC team |
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| Credential harvest URL blocked | SIEM | SOC team |
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| Malicious attachment blocked | Email + SIEM | SOC team |
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| DMARC failure from partner domain | Email | Email admin |
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## Quarterly Review Checklist
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- [ ] Update VIP protection list
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- [ ] Review false positive rates
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- [ ] Analyze user-reported phishing misses
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- [ ] Update domain allow/block lists
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- [ ] Test detection with simulated phishing
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- [ ] Review and update custom rules
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- [ ] Verify SIEM integration working
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