Suspicious Teams Message Soft Delete by Agent Identity via M365 Audit
- Product
- m365
- Service
- audit
- Author
- HuntRule
- Published
- 2026-06-09
- Updated
- 2026-08-28
ATT&CK techniques
Defense Evasion → Lateral MovementRecon
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 soft deletion of Teams channel messages, the cleanup step observed when a compromised Entra agent identity posts internal phishing links and then removes the evidence. Adversaries delete their own messages to hide internal spearphishing and slow investigation, so agent-driven message deletions in Teams warrant correlation with preceding message-send activity.
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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