TanStack Supply-Chain Attack Execution Indicators - Linux

Status: experimental
Severity: high
Log source: category process_creation, product linux
Author: Leonardo Gasparini
Source: github.com/SigmaHQ/sigma

Detects process execution indicators associated with the Mini Shai-Hulud supply-chain campaign targeting TanStack npm packages and others such as mistralai and uipath reported on early May 2026. The preinstall hook runs setup.mjs, which downloads a platform-specific Bun runtime.

Known false positives

Unlikely

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1059.006` Command and Scripting Interpreter: Python `T1059.007` Command and Scripting Interpreter: JavaScript `T1204.002` User Execution: Malicious File

Telemetry coverage

Platform	Record / event type
Linux	Event ID 1: Process Create

Rule body

title: TanStack Supply-Chain Attack Execution Indicators - Linux
id: 3c6f5e4a-8d0b-6abc-d9e2-4f7a6b8c9d0e
status: experimental
description: |
    Detects process execution indicators associated with the Mini Shai-Hulud supply-chain campaign targeting TanStack npm packages and others such as mistralai and uipath reported on early May 2026.
    The preinstall hook runs setup.mjs, which downloads a platform-specific Bun runtime.
references:
    - https://socket.dev/blog/tanstack-npm-packages-compromised-mini-shai-hulud-supply-chain-attack
    - https://socket.dev/supply-chain-attacks/mini-shai-hulud
    - https://safedep.io/mass-npm-supply-chain-attack-tanstack-mistral/
author: Leonardo Gasparini
date: 2026-05-12
tags:
    - attack.execution
    - attack.t1059.007
    - attack.t1059.006
    - attack.t1204.002
    - detection.emerging-threats
logsource:
    category: process_creation
    product: linux
detection:
    selection_bun_runner:
        Image|endswith: '/bun'
        CommandLine|contains|all:
            - 'bun'
            - 'run'
            - 'tanstack_runner.js'
    selection_pypi_payload:
        # observed on guardrails-ai@0.10.1 compromise
        Image|contains: '/python3'
        CommandLine|contains: '/tmp/transformers.pyz'
    condition: 1 of selection_*
falsepositives:
    - Unlikely
level: high

Stages and Predicates

Stage 0: `condition`

1 of selection_*

Stage 1: `selection_bun_runner`

selection_bun_runner:
    Image|endswith: '/bun'
    CommandLine|contains|all:
        - 'bun'
        - 'run'
        - 'tanstack_runner.js'

Stage 2: `selection_pypi_payload`

selection_pypi_payload:
    Image|contains: '/python3'
    CommandLine|contains: '/tmp/transformers.pyz'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`/tmp/transformers.pyz` `bun` `run` `tanstack_runner.js`	`field:"CommandLine" kind:match`
`Image`	ends_with	`/bun`	`field:"Image" kind:ends_with value:"/bun"`
`Image`	match	`/python3`	`field:"Image" kind:match value:"/python3"`