feat: Shai-Hulud: The Second Coming Rules #5772
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nasbench
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Nov 25, 2025
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For the windows version please start providing logs
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phantinuss
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Dec 9, 2025
...inux/process_creation/proc_creation_lnx_susp_script_interpretor_spawn_credential_scanner.yml
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Co-authored-by: phantinuss <79651203+phantinuss@users.noreply.github.com>
frack113
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| - https://www.aikido.dev/blog/shai-hulud-strikes-again-hitting-zapier-ensdomains | ||
| - https://semgrep.dev/blog/2025/digging-for-secrets-sha1-hulud-the-second-coming-of-the-npm-worm/ | ||
| author: Swachchhanda Shrawan Poudel (Nextron Systems) | ||
| date: 2025-11-25 |
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Suggested change
| date: 2025-11-25 | |
| date: 2026-01-24 |
| selection: | ||
| TargetFilename|endswith: '.github/workflows/shai-hulud-workflow.yml' | ||
| TargetFilename|endswith: | ||
| - '.github/workflows/discussion.yaml' |
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Suggested change
| - '.github/workflows/discussion.yaml' |
| - https://www.safetycli.com/blog/shai-hulud-npm-attack-runs-malicious-github-action | ||
| author: Swachchhanda Shrawan Poudel (Nextron Systems) | ||
| date: 2025-09-24 | ||
| modified: 2025-11-25 |
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| modified: 2025-11-25 | |
| modified: 2026-01-24 |
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| - 'shai-hulud-workflow.yml' | ||
| - 'shai-hulud.yml' | ||
| - 'shai-hulud-workflow.yaml' | ||
| - 'shai-hulud.yaml' | ||
| - '.github/workflows/discussion.yaml' |
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Got an example of where will this show up in the github audit ? Cuz to my knowledge, the workflow filename does not show up.
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| selection_keyword: | ||
| # Keeping the detection broad to catch shai-hulud related activities in any log field (e.g., action, workflow, repository); refine by specifying fields as needed | ||
| - 'Shai-Hulud' | ||
| - 'SHA1HULUD' |
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| selection_child_setup_powershell: | ||
| CommandLine|contains|all: | ||
| - 'irm bun.sh/install.ps1' | ||
| - 'iex' |
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Can be found in legitimate scripts. Example https://github.com/thedotmack/claude-mem/blob/main/scripts/smart-install.js#L127
Suggested change
| selection_child_setup_powershell: | |
| CommandLine|contains|all: | |
| - 'irm bun.sh/install.ps1' | |
| - 'iex' |
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| selection_child_spawn_check: | ||
| CommandLine|contains: 'cmd.exe /d /s /c "where bun"' |
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| selection_child_path_reload: | ||
| CommandLine|contains|all: | ||
| - 'powershell' | ||
| - "[Environment]::GetEnvironmentVariable('PATH', 'User')" | ||
| - "[Environment]::GetEnvironmentVariable('PATH', 'Machine')" |
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| selection_child_spawn_check: | ||
| CommandLine|contains|all: | ||
| - 'which' | ||
| - 'bun' |
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Same comments with windows. Reduce this to specific things related to the attack not unrelated.
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Summary of the Pull Request
Changelog
new: Shai-Hulud Malware Indicators - Github
new: Shai-Hulud Malware Indicators - Linux
new: Shai-Hulud Malware Indicators
new: Shai-Hulud Malicious Bun Execution - Linux
new: Shai-Hulud Malicious Bun Execution
new: Script Interpretor Spawning Credential Scanner - Windows
new: Script Interpretor Spawning Credential Scanner
new: Shai-Hulud 2.0 Malicious NPM Package Installation - Linux
new: Shai-Hulud 2.0 Malicious NPM Package Installation
update: Shai-Hulud Malicious GitHub Workflow Creation - add more shai-hulud associated workflows
update: Shai-Hulud NPM Attack GitHub Activity - add more shai-hulud associated workflows
Example Log Event
Fixed Issues
SigmaHQ Rule Creation Conventions