Defender Timeline Downloader: Extending Data Retention for Incident Response

Source: www.binaryanalys.is

Author: Matthieu Gras

URL: https://binaryanalys.is/posts/defender_timeline/

https://binaryanalys.is/posts/defender_timeline/

ONE SENTENCE SUMMARY:

A new tool automates full six-month data retrieval from Microsoft Defender for Endpoint, overcoming manual limitations and API restrictions.

MAIN POINTS:

  1. Microsoft Defender for Endpoint retains telemetry data for 180 days.
  2. API access is limited to 30 days, restricting programmatic investigations.
  3. The Timeline in the portal accesses older data but lacks API support.
  4. Exporting from the UI is limited to specific intervals and formats.
  5. A tool was developed to automate data extraction, bypassing the 30-day limit.
  6. It interacts with hidden proxy endpoints and authenticates via cookies.
  7. Reverse engineering enables complete, structured JSON log retrieval.
  8. The tool uses concurrency to efficiently handle large data volumes.
  9. A high-concurrency architecture optimizes download speed.
  10. Performance benchmarks demonstrate significant efficiency gains over existing methods.

TAKEAWAYS:

  1. The tool provides automated access to six-month endpoint data, overcoming API limits.
  2. By using proxy endpoints, it captures complete data sets not available through UI exports.
  3. Authentication complexities are handled with advanced session management.
  4. The high-concurrency design ensures fast, scalable data processing.
  5. Available open source on GitHub for use and adaptation in incident response.