Sigma rule: Shai-Hulud NPM Package Malicious Exfiltration via Curl

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-dc210765b6f8, updated 2025-09-24T00:00:00.000Z.

Rule

Title
Shai-Hulud NPM Package Malicious Exfiltration via Curl
Status
experimental
Level
high
Author
Swachchhanda Shrawan Poudel (Nextron Systems)
Date
2025-09-24
File
rules-emerging-threats/2025/Malware/Shai-Hulud/proc_creation_lnx_mal_shai_hululd_exfiltration.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects potential Shai Hulud NPM package attack attempting to exfiltrate data via curl to external webhook sites.

Log source

product
linux
category
process_creation

Detection

selection:
    Image|endswith: '/curl'
    CommandLine|contains|all:
        - 'curl'
        - '-d'
        - 'webhook.site/bb8ca5f6-4175-45d2-b042-fc9ebb8170b7'
condition: selection

False positives (as the rule lists them)

  • Unlikely

Tags

  • attack.exfiltration
  • attack.t1041
  • attack.collection
  • attack.t1005
  • detection.emerging-threats

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2025/Malware/Shai-Hulud/proc_creation_lnx_mal_shai_hululd_exfiltration.yml

Sources and licences

  • SigmaHQ

    "Shai-Hulud NPM Package Malicious Exfiltration via Curl" by Swachchhanda Shrawan Poudel (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2025/Malware/Shai-Hulud/proc_creation_lnx_mal_shai_hululd_exfiltration.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Shai-Hulud NPM Package Malicious Exfiltration via Curl",
entity page, dataset version ref-dc210765b6f8, updated 2025-09-24T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/efd2eb09-b72e-4a61-8dc7-b1382a1e8983 (accessed 2026-11-03).
Underlying source: SigmaHQ rule efd2eb09-b72e-4a61-8dc7-b1382a1e8983, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.