huntrule

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

Related detections9 linkedT1218 — drag to rearrange
Suspicious Cabinet Extraction of Masqueraded vstm Archive via extrac32
Malicious DLL Execution via Wuauclt Update Handler (via process_creation)
Malicious aspnet_compiler.exe Injection Host Spawned by PowerShell via process_creation
Malicious regsvcs LOLBin Loading Ransomware DLL from UNC Path
Suspicious RegAsm or RegSvcs Spawned by Script Host (via process_creation)
Suspicious Extexport DLL Side-Loading Execution
Malicious ClickFix Execution Chain Spawning MSHTA via Pcalua on EtherRAT Infection
Suspicious TALONITE Certutil LOLBIN Decode and Download Abuse (via process_creation)
Suspicious Renamed git Binary gcmd.exe Execution (via process_creation)
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.