Sigma rule: Script Interpreter Spawning Credential Scanner - Linux

Rule

Title

Script Interpreter Spawning Credential Scanner - Linux

Status

experimental

Level

high

Author

Swachchhanda Shrawan Poudel (Nextron Systems)

Date

2025-11-25

File

rules/linux/process_creation/proc_creation_lnx_susp_script_interpretor_spawn_credential_scanner.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

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.

Log source

product

linux

category

process_creation

Detection

selection_parent:
    ParentImage|endswith:
     # Add more script interpreters as needed
        - '/node'
        - '/bun'
selection_child:
    - Image|endswith:
          - '/trufflehog'
          - '/gitleaks'
    - CommandLine|contains:
          - 'trufflehog'
          - 'gitleaks'
condition: all of selection_*

False positives (as the rule lists them)

• Legitimate pre-commit hooks or CI/CD pipeline jobs that use a script to run a credential scanner as part of a security check.

Tags

• attack.credential-access
• attack.t1552
• attack.execution
• attack.collection
• attack.t1005
• attack.t1059.004

MITRE ATT&CK ids this rule names

• T1005
• T1059.004
• T1552

Related rules

• 0f60b28c-64dd-4e2c-9a63-5334d3e3a6e6 (similar)

References

• https://github.com/asyncapi/cli/blob/2efa4dff59bc3d3cecdf897ccf178f99b115d63d/bun_environment.js
• https://www.stepsecurity.io/blog/sha1-hulud-the-second-coming-zapier-ens-domains-and-other-prominent-npm-packages-compromised
• https://www.endorlabs.com/learn/shai-hulud-2-malware-campaign-targets-github-and-cloud-credentials-using-bun-runtime
• https://semgrep.dev/blog/2025/digging-for-secrets-sha1-hulud-the-second-coming-of-the-npm-worm/

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/linux/process_creation/proc_creation_lnx_susp_script_interpretor_spawn_credential_scanner.yml