Script Interpreter Spawning Credential Scanner - Windows

calendar Mar 29, 2026 · attack.credential-access attack.t1552 attack.collection attack.execution attack.t1005 attack.t1059.007  ·
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Detects a script interpreter process (like node.js or bun) spawning a known credential scanning tool (e.g., trufflehog, gitleaks). This behavior is indicative of an attempt to find and steal secrets, as seen in the "Shai-Hulud: The Second Coming" campaign.

Sigma rule (View on GitHub)

 1title: Script Interpreter Spawning Credential Scanner - Windows
 2id: 0f60b28c-64dd-4e2c-9a63-5334d3e3a6e6
 3related:
 4    - id: f0025a69-e1b7-4dda-a53c-db21fa2d4071
 5      type: similar
 6status: experimental
 7description: |
 8    Detects a script interpreter process (like node.js or bun) spawning a known credential scanning tool (e.g., trufflehog, gitleaks).
 9    This behavior is indicative of an attempt to find and steal secrets, as seen in the "Shai-Hulud: The Second Coming" campaign.    
10references:
11    - https://github.com/asyncapi/cli/blob/2efa4dff59bc3d3cecdf897ccf178f99b115d63d/bun_environment.js
12    - https://www.stepsecurity.io/blog/sha1-hulud-the-second-coming-zapier-ens-domains-and-other-prominent-npm-packages-compromised
13    - https://www.endorlabs.com/learn/shai-hulud-2-malware-campaign-targets-github-and-cloud-credentials-using-bun-runtime
14    - https://semgrep.dev/blog/2025/digging-for-secrets-sha1-hulud-the-second-coming-of-the-npm-worm/
15author: Swachchhanda Shrawan Poudel (Nextron Systems)
16date: 2025-11-25
17tags:
18    - attack.credential-access
19    - attack.t1552
20    - attack.collection
21    - attack.execution
22    - attack.t1005
23    - attack.t1059.007
24logsource:
25    category: process_creation
26    product: windows
27detection:
28    selection_parent:
29        ParentImage|endswith:
30           # Add more script interpreters as needed
31            - '\node.exe'
32            - '\bun.exe'
33    selection_child:
34        - Image|endswith:
35              - 'trufflehog.exe'
36              - 'gitleaks.exe'
37        - CommandLine|contains:
38              - 'trufflehog'
39              - 'gitleaks'
40    condition: all of selection_*
41falsepositives:
42    - Legitimate pre-commit hooks or CI/CD pipeline jobs that use a script to run a credential scanner as part of a security check.
43level: high
44regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_susp_script_interpretor_spawn_credential_scanner/info.yml

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