Suspicious Inbox Rule Moving Mail to Junk for Concealment (via m365)
- Product
- m365
- Service
- exchange
- Author
- HuntRule
- Published
- 2026-07-08
- Updated
- 2026-08-28
ATT&CK techniques
Defense EvasionRecon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
What it detects
This rule detects creation or modification of a mailbox inbox rule that moves incoming messages to the junk email folder. Threat actors created such rules to hide fraud notifications and security alerts from the victim while automating financially driven attacks.
Reporting behind it
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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Also included
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