M365EXO-003: Anti-malware policy audit
- 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
Anti-malware policies in Exchange Online scan email attachments for known malware, viruses, and malicious content before delivery. Default anti-malware settings may not block all dangerous file types, and certain attachment types commonly used in attacks such as executables and scripts may pass through without filtering. A comprehensive anti-malware policy with common attachment type filtering is essential to prevent malware delivery via email.
Valor recomendado
Common attachment types filter enabled blocking executable and script file types; zero-hour auto purge enabled; admin notifications enabled for malware detection
Remediación
Review the anti-malware policy and enable the common attachments filter to block dangerous file types including exe, vbs, js, ps1, bat, cmd, and other executable formats. Enable zero-hour auto purge (ZAP) to retroactively remove malware detected in already-delivered messages. Configure administrator notifications to alert the security team when malware is detected and verify that the policy is applied to all recipients in the organization.
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 | WARN |
| throttled | Not Assessed |
Mapeos a marcos de referencia
- NIST SP 800-53
- SI-3
- CIS M365 Benchmark
- 2.1.3
- MITRE ATT&CK
- T1204