M365EXO-019: DMARC aggregate report contact configured (MS.EXO.4.3)
- Plataforma
- Entra ID / M365
- Categoría
- Advanced Threat Protection
- Severidad
- Medium
- Pilar de Zero Trust
- Applications & Workloads (peso 1)
- Fixtures de referencia
- 3
- Cobertura de ramas
- Observada: los fixtures prueban los veredictos que ejercitan
- Procedencia
- baseline
Qué comprueba
SCuBA MS.EXO.4.3 requires that the DMARC aggregate report contact (RUA) include reports@dmarc.cyber.dhs.gov for federal executive-branch agencies, and more generally that an aggregate report destination be configured. Aggregate reports give domain owners visibility into who is sending mail as their domain, which is essential for safely advancing to p=reject and detecting spoofing campaigns.
Valor recomendado
DMARC record includes an rua= aggregate report destination; federal executive-branch agencies include reports@dmarc.cyber.dhs.gov
Remediación
Add an rua= tag to each DMARC record pointing to a monitored mailbox or report-processing service so aggregate reports are collected and reviewed. Federal executive-branch departments and agencies must include reports@dmarc.cyber.dhs.gov in the RUA field per BOD 18-01. Ensure the receiving mailbox or service is actively monitored so spoofing trends are acted upon.
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
- CISA SCuBA
- MS.EXO.4.3v1, MS.EXO.4.4v1
- NIST SP 800-53
- SI-8, AU-6
- MITRE ATT&CK
- T1566.001