M365EXO-030: Malware emails quarantined or dropped (MS.EXO.10.2)
- Platform
- Entra ID / M365
- Category
- Advanced Threat Protection
- Severity
- High
- Zero Trust pillar
- Applications & Workloads (weight 2)
- Golden fixtures
- 3
- Branch coverage
- Observed: fixtures prove the verdicts they exercise
- Provenance
- baseline
What it checks
SCuBA MS.EXO.10.2 requires that emails identified as containing malware be quarantined or dropped. Detection alone is insufficient if the malicious message is still delivered. The anti-malware policy must take a removal action so users cannot interact with messages found to contain malware.
Recommended value
Anti-malware policy action quarantines or drops messages identified as malware (no deliver-with-warning action)
Remediation
Configure the anti-malware policy so messages identified as containing malware are quarantined or dropped rather than delivered. Verify no policy is set to deliver malware-positive messages with only a warning. Confirm administrator notifications are enabled so the security team is alerted on detections.
Fixture-proven verdicts
Every verdict below is proven by a golden fixture in the module's gating test suite. This table derives from the last green run; it cannot be edited by hand.
| Scenario | Expected verdict |
|---|---|
| clean | PASS |
| empty | FAIL |
| throttled | Not Assessed |
Framework mappings
- NIST SP 800-53
- SI-3
- MITRE ATT&CK
- T1566.001