M365EXO-029: Emails scanned for malware (MS.EXO.10.1)
- 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.10.1 requires that emails be scanned for malware. Email is a primary malware delivery channel; scanning inbound mail detects known malicious content before it reaches users. An organization with no active anti-malware policy leaves users directly exposed to malware-laden attachments.
Recommended value
At least one active anti-malware policy applied to all recipients
Remediation
Confirm at least one anti-malware policy is active and applied to all recipients so inbound mail is scanned for malware. If using a comparable third-party solution, verify it is enabled and covers all inbound mail. Periodically review detection telemetry to confirm scanning is functioning.
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