huntrule

Windows Process Creation: curl Uploads to File-Sharing Domains

Detects curl commands on Windows uploading files to common file sharing/upload domains.

FreeReviewedSigma · High · v2
Product
windows
Category
process_creation
Author
Swachchhanda Shrawan Poudel (Nextron Systems) (SigmaHQ), DRL 1.1
Published
2026-03-29
Updated
2026-07-31
AnalysisDetection

ATT&CK techniques

Exfiltration

  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 flags Windows process creation where curl is invoked and the command line references known file-sharing or upload domains. Such activity may indicate data exfiltration or staging of files through public hosting services. It relies on process creation telemetry, specifically the image path or original filename for curl and command-line content containing targeted upload domains and common curl upload-related flags.

Reporting behind it

Related detections9 linkedT1567.002 — drag to rearrange
Suspicious ALPHA SPIDER Rclone Exfiltration Tool Masquerading as System Binary (via process_creation)
Malicious GhostLocker2 C2 Communication via HTTP POST (via proxy)
Suspicious Rclone Exfiltration Masquerading as wininit.exe
Malicious Bulk Data Exfiltration via Rclone (via process_creation)
Rclone SMB Share Exfiltration
Suspicious Data Exfiltration via Rclone to Cloud Storage (via process_creation)
Malicious Data Exfiltration via MEGAcmd
Suspicious Command and Control via Discord or Telegram Bot API
Data Exfiltration to WebDAV Share via curl Upload
Windows Process Creation: curl Uploads to File-Sharing Domains
Pivot detection · T1567.002 · 9 related

Changelog

v2
  1. v2
    Candidate ingested via manual entry.2026-07-31
  2. v1
    No changelog recorded for this version.2026-07-30

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