Suspicious Email-Hiding Inbox Rule Creation (via exchange)

ATT&CK techniques

Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1564.008Email Hiding Rules
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects creation of a mailbox rule that automatically deletes messages or moves them to obscure folders such as RSS Feeds or Junk, a defense-evasion behavior adversaries use to hide security alerts and their own correspondence after account compromise. Email-hiding rules feature in the Red Canary Threat Detection Report as a post-compromise persistence and evasion tactic in business email compromise. Detecting these rules surfaces attacker efforts to stay unnoticed.

Reporting behind it

Related detections5 linkedT1564.008 — drag to rearrange

Suspicious Inbox Rule Moving Mail to Junk for Concealment (via m365)

Detect Email Forwarding/Redirecting via Exchange PowerShell InboxRule Cmdlets on Windows

Windows PowerShell: New-InboxRule/Set-InboxRule Script Block Activity

Microsoft 365 Audit Logs: Inbox Rule Creation or Update with Email Hiding Actions

O365 Mail Forwarding and Redirecting Rule Changes

Suspicious Email-Hiding Inbox Rule Creation (via exchange)

Pivot detection · T1564.008 · 5 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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