How to Find a Downloaded File Hash in Microsoft 365 Audit Logs
Question details
The user needs to locate the specific JSON field containing the hash of a downloaded file within Microsoft 365 audit logs for a forensic investigation.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Conducting a forensic investigation that requires tracking file download hashes in Microsoft 365 audit logs.
- Observed behavior
- The user is unsure which field in the Microsoft 365 audit log JSON response contains the downloaded file hash value.
Ensure you have the necessary administrative privileges in the Microsoft Purview compliance portal to search, view, and export detailed audit logs.
Review Microsoft 365 Audit Log Detailed Properties
The most reliable way to find which JSON field contains the file hash is to consult the official Microsoft 365 compliance documentation for audit log properties.
Audit log schemas in Microsoft 365 can be extensive. Different workloads like SharePoint and OneDrive record file activities slightly differently, and the specific JSON fields returned can vary based on the event type.
Navigate to the official Microsoft documentation regarding detailed properties in the Office 365 audit log.
Look for documentation sections covering file-related events, specifically focusing on 'FileDownloaded' or similar SharePoint/OneDrive file operations.
Check the JSON schema descriptions for fields such as FileHash, SHA256, or similar property values that indicate a cryptographic hash of the downloaded item.
Consult Microsoft Q&A for Advanced Forensic Queries
If the audit event does not natively contain a file hash, you should reach out to Microsoft's developer and forensic community for advanced guidance.
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Frequently Asked Questions
Do all Microsoft 365 file download events include a file hash in the audit log?
Not necessarily. The availability of a file hash in the JSON audit log depends on the specific workload (such as SharePoint or OneDrive) and the Microsoft 365 tenant's configuration and licensing level. You must verify the detailed properties in the official compliance documentation.
Where can I search and export Microsoft 365 audit logs?
Audit logs can be searched and exported directly from the Microsoft Purview compliance portal under the 'Audit' section, provided your account has the necessary administrative permissions.
What should I do if the file hash is missing from the JSON output?
If the file hash is crucial for your forensic investigation and is missing from the standard JSON output, it is recommended to post your specific query on the Microsoft Q&A platform to get advanced guidance from security and compliance experts.
