M365EXO-031: Post-delivery malware scanning enabled (MS.EXO.10.3)
- Plataforma
- Entra ID / M365
- Categoría
- Advanced Threat Protection
- Severidad
- High
- Pilar de Zero Trust
- Applications & Workloads (peso 2)
- Fixtures de referencia
- 3
- Cobertura de ramas
- Observada: los fixtures prueban los veredictos que ejercitan
- Procedencia
- baseline
Qué comprueba
SCuBA MS.EXO.10.3 requires that email scanning be capable of reviewing emails after delivery. Malware signatures update continuously, so a message benign at delivery may later be recognized as malicious. Zero-hour auto purge (ZAP) retroactively removes such messages from mailboxes, reducing the window of exposure.
Valor recomendado
Zero-hour auto purge (ZAP) enabled on all anti-malware policies (ZapEnabled = True)
Remediación
Enable zero-hour auto purge (ZAP) on every anti-malware policy so messages later identified as malware are removed from mailboxes after delivery. Confirm ZAP is enabled across all policies, not just the default. Where a comparable third-party solution is used, verify it provides equivalent post-delivery remediation.
Veredictos probados con fixtures
Cada veredicto de esta tabla está probado por un fixture de referencia en la suite de pruebas que valida el módulo. La tabla se deriva de la última ejecución en verde; no puede editarse a mano.
| Escenario | Veredicto esperado |
|---|---|
| clean | PASS |
| known-bad | FAIL |
| throttled | Not Assessed |
Mapeos a marcos de referencia
- NIST SP 800-53
- SI-3
- MITRE ATT&CK
- T1566.001