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
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Suspicious Lambda Function Creation Across Regions in AWS Extortion Operation
Malicious Data Exfiltration via Renamed Rclone Using Masqueraded Configuration
Suspicious Cloud Exfiltration via Rclone
Suspicious Rclone Cloud Sync Execution for Data Exfiltration via Command Line
Suspicious Data Exfiltration via MEGAsync (via process_creation)
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.