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Windows: File Download via msedge_proxy.exe Using HTTP/HTTPS URLs

Flags msedge_proxy.exe executions that include HTTP/HTTPS URLs, consistent with arbitrary file downloads.

FreeReviewedSigma · Medium · v1
Product
windows
Category
process_creation
Author
Swachchhanda Shrawan Poudel (SigmaHQ), DRL 1.1
Published
2023-11-09
Updated
2026-07-30
AnalysisDetection

ATT&CK techniques

Defense Evasion

  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Execution

  5. Persistence

  6. Priv Esc

  7. Defense Evasion

  8. Cred Access

  9. Discovery

  10. Lateral Movement

  11. Collection

  12. C2

  13. Exfiltration

  14. Impact

What it detects

This rule identifies Windows process executions of msedge_proxy.exe where the command line includes http:// and https://, indicating an attempt to download an arbitrary file. Downloading via a trusted proxy binary can help attackers blend in with normal browser-adjacent activity and reduce suspicion. The detection relies on process creation telemetry, matching the executable name/path and the presence of HTTP/HTTPS in the command line.

Reporting behind it

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Windows: File Download via msedge_proxy.exe Using HTTP/HTTPS URLs
Pivot detection · T1218 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.