Individual skill
detecting-email-forwarding-rules-attack
Detect malicious email forwarding rules created by adversaries to maintain persistent access to email communications for intelligence collection and BEC attacks.
internal/tools/skills/data/threat-hunting/detecting-email-forwarding-rules-attack/SKILL.md
Source commit d42f381ad34843e71a42658e5c57290c713e85af
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- Yes
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- Yes
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- Skill scan complete
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- Observed behavior
- Instructions only
- Last checked
- Nov 9, 2026
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- Repository stars (not skill ratings)
- 1,313
- Repository last updated
- Nov 8, 2026
- License
- Apache-2.0
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- cybersecurity Repository topic
- security Repository topic
- bug-bounty Repository topic
- automation Repository topic
- autonomous-pentesting Repository topic
- ai-agent Repository topic
- ai-security Repository topic
- ethical-hacking Repository topic
- golang Repository topic
- penetration-testing Repository topic
- threat-hunting Declared skill tag
- mitre-attack Declared skill tag
- email-forwarding Declared skill tag
- persistence Declared skill tag
- bec Declared skill tag
- t1114 Declared skill tag
- proactive-detection Declared skill tag
- security Derived category
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# Detecting Email Forwarding Rules Attack
## When to Use
- When proactively hunting for indicators of detecting email forwarding rules attack in the environment
- After threat intelligence indicates active campaigns using these techniques
- During incident response to scope compromise related to these techniques
- When EDR or SIEM alerts trigger on related indicators
- During periodic security assessments and purple team exercises
## Detection Gaps & Validation
- **Forwarding hides in three places.** Querying only inbox rules (`New-InboxRule`) misses mailbox-level forwarding (`Set-Mailbox -ForwardingSmtpAddress` / `-ForwardingAddress`) and Exchange transport rules. Hunt all three operations or you cover only a third of the attack surface.
- **Log source must be on.** M365 detection depends on the Unified Audit Log and mailbox auditing. Verify with `Get-AdminAuditLogConfig` / `Get-Mailbox | fl AuditEnabled`; if UAL is off, `New-InboxRule`/`Set-Mailbox`/`UpdateInboxRules` events never land.