Security checks / Check reference / Devices & compliance
Intune Device Malware Signature Out Of Date
Medium Severity Microsoft 365 security check in the Devices & compliance domain.
Managed device reports Microsoft Defender Antivirus security intelligence (signature) updates are overdue. Intune's windowsProtectionState flags the device's antimalware signatures as out of date. Siemserva runs this check automatically across your tenant and maps every finding to the compliance frameworks below.
Check summary
What this check verifies
Managed device reports Microsoft Defender Antivirus security intelligence (signature) updates are overdue.
Why it matters
Intune's windowsProtectionState flags the device's antimalware signatures as out of date. Stale signatures mean recently identified malware is not recognized, so the device is exposed to current threats even with real-time protection enabled.
How to fix it
Force a security intelligence update on the device (Defender Antivirus checks for updates on sync). Verify the device has network connectivity to the update source and is not stuck offline. If signatures stay overdue, investigate the agent state and update channel configuration.
Siemserva flags every tenant where this check fails and, with Senserva Trustworthy AI remediation, can propose a validated fix you approve before it applies.
Ask your own AI about this check
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Compliance framework mappings
Findings from this check serve as evidence for:
References
Related Devices & compliance checks
Common questions
What does the Intune Device Malware Signature Out Of Date check verify?
Managed device reports Microsoft Defender Antivirus security intelligence (signature) updates are overdue. It is a Medium Severity check in the Devices & compliance domain, one of the 650+ checks Siemserva runs across Microsoft 365, Intune, Defender, and Entra ID.
How do I fix a Intune Device Malware Signature Out Of Date finding?
Force a security intelligence update on the device (Defender Antivirus checks for updates on sync). Verify the device has network connectivity to the update source and is not stuck offline. If signatures stay overdue, investigate the agent state and update channel configuration. Siemserva ranks the finding by Severity and, with Senserva Trustworthy AI, can propose a validated, approve-before-apply configuration fix.
Which compliance frameworks does this check evidence?
Findings from this check map to SCuBA, MCSB, NIST, SOC2, CIS, HIPAA, and MCSB controls ES-3, PV-6. That mapping is what turns a scan finding into audit evidence.
Can I ask my own AI about this check?
Yes. This page includes a free copy-paste AI prompt carrying the check's facts: what it verifies, the risk, the remediation, and the framework mappings. Paste it into Claude, ChatGPT, or Copilot; cite-worthy detail without giving an AI access to your tenant.
All 672 checks with severities and mappings: the Microsoft 365 security checks catalog.