Shai-Hulud Malicious GitHub Workflow Creation

Description

Detects creation of shai-hulud-workflow.yml file associated with Shai Hulud worm targeting NPM supply chain attack that exfiltrates GitHub secrets

Query · sigma

selection:
  TargetFilename|endswith:
  - .github/workflows/shai-hulud-workflow.yaml
  - .github/workflows/shai-hulud-workflow.yml
  - .github/workflows/shai-hulud.yaml
  - .github/workflows/shai-hulud.yml
condition: selection

Known false positives

  • Unlikely
Raw source Shai-Hulud Malicious GitHub Workflow Creation · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Shai-Hulud Malicious GitHub Workflow Creation
id: 0aba5685-6db6-486f-88ef-29a99c545cfd
status: experimental
description: Detects creation of shai-hulud-workflow.yml file associated with Shai Hulud worm targeting NPM supply chain attack that exfiltrates GitHub secrets
references:
    - https://www.safetycli.com/blog/shai-hulud-npm-attack-runs-malicious-github-action
author: Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2025-09-24
modified: 2026-01-24
tags:
    - attack.persistence
    - attack.credential-access
    - attack.t1552.001
    - attack.collection
    - attack.t1119
    - detection.emerging-threats
logsource:
    product: linux
    category: file_event
detection:
    selection:
        TargetFilename|endswith:
            - '.github/workflows/shai-hulud-workflow.yaml'
            - '.github/workflows/shai-hulud-workflow.yml'
            - '.github/workflows/shai-hulud.yaml'
            - '.github/workflows/shai-hulud.yml'
    condition: selection
falsepositives:
    - Unlikely
level: high

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