Malicious Azure AD Application Consent Granted with Mail Permissions

ATT&CK techniques

Defense Evasion → Lateral Movement

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1550.001Application Access Token
Cred Access
- T1528Steal Application Access Token
Discovery
Lateral Movement
- T1550.001Application Access Token
Collection
C2
Exfiltration
Impact

What it detects

This rule detects an Azure AD consent grant to an application that requests mailbox permissions such as Mail.Read, Mail.Send or offline_access. It maps to illicit consent phishing where an attacker tricks a user into authorising a malicious OAuth application for persistent mailbox access. Detecting it exposes token-based access to corporate mail without credential theft.

Reporting behind it

Related detections9 linkedT1528 — drag to rearrange

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Suspicious Microsoft 365 OAuth Authorization to Visual Studio Code Client

Suspicious Microsoft Entra Device Code Authentication Flow

Suspicious Google Workspace OAuth Authorization for Chrome Web Store Scope via Token Audit

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

Malicious Azure AD Application Consent Granted with Mail Permissions

Pivot detection · T1528 · 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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