Suspicious OAuth Consent Grant to Mail Access Permissions via Azure AD

ATT&CK techniques

Persistence → Lateral Movement

Recon
Resource Dev
Initial Access
Execution
Persistence
- T1098.002Additional Email Delegate Permissions
Priv Esc
- T1098.002Additional Email Delegate Permissions
Defense Evasion
- T1550.001Application Access Token
Cred Access
Discovery
Lateral Movement
- T1550.001Application Access Token
Collection
C2
Exfiltration
Impact

What it detects

This rule detects OAuth application consent grants that request mailbox read/send and offline access scopes in Azure AD audit logs. This aligns with the Huntress traitorware campaign where adversaries consent legitimate mail clients to gain persistent mailbox access, letting them read and send mail via issued tokens without touching the password.

Reporting behind it

Related detections9 linkedT1550.001 — drag to rearrange

Suspicious Federated Identity Credential On-Behalf-Of Token Flow via Sign-In Logs

Suspicious Entra ID Application Consent Failure Indicating Unauthorized OAuth Grant Attempt (via azure)

Malicious Business Email Compromise OAuth Application Sign-In via Entra ID Service Principal (via azure)

Suspicious Salesforce Bulk API Export via aiohttp User Agent

Suspicious ApplicationImpersonation Role Assigned to Mailbox Principal (via m365)

Suspicious Entra Sign-In With Axios Automation User-Agent via AiTM Token Replay (via azure)

Malicious Azure AD Token Abuse via Roadtx

Suspicious M365 Sign-In from Synthetic iPhone User Agent via m365

Possible Illicit Consent Grant to OAuth Application via Azure AD

Suspicious OAuth Consent Grant to Mail Access Permissions via Azure AD

Pivot detection · T1550.001 · 9 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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