Month: November 2025

Yes — C:\inetpub\DeviceHealthAttestation\bin\hassrv.dll is a legitimate Windows component. It belongs to the Device Health Attestation (DHA) service, a Microsoft security feature introduced in Windows 10 and Windows Server 2016. The DLL is part of the server role that validates a device’s Trusted Platform Module (TPM) and boot measurements, then issues a health attestation report.

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🔍 What Device Health Attestation Does

• Purpose: DHA verifies that a device booted securely (e.g., Secure Boot, BitLocker, ELAM checks) and that the Windows kernel wasn’t tampered with.
• Integration: It works with Mobile Device Management (MDM) solutions and Active Directory/Entra ID to enforce compliance policies.
• Deployment: Microsoft offers DHA as:
  • A cloud service (Microsoft-managed, free).
  • An on-premises server role (installed on Windows Server, where hassrv.dll is part of the role).
  • An Azure-hosted service.

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📂 Why You See It in C:\inetpub\DeviceHealthAttestation

• The DHA server role installs into IIS (inetpub) because it exposes a web API endpoint for devices to submit attestation requests.
• The hassrv.dll file is the Health Attestation Service library that processes those requests.
• Reports from admins confirm that copying hassrv.dll from Server 2016 is sometimes used to fix DHA role issues on newer Server versions.
• Microsoft’s own documentation and patch notes reference this file as part of the DHA feature.

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✅ Safety Assessment

• Safe if installed by Windows Update or Server Role Manager: It’s a signed Microsoft DLL, not malware.
• Check digital signature: Right‑click → Properties → Digital Signatures tab. It should be signed by Microsoft Windows.
• Context matters: If you didn’t manually place it there and it appeared after a Windows update or server role installation, it’s expected and safe.

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In short: hassrv.dll is a normal part of Microsoft’s Device Health Attestation service. If it’s digitally signed by Microsoft and located under C:\inetpub\DeviceHealthAttestation\bin\, you can consider it safe.

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