TanStack Supply-Chain Attack File Creation Indicators - Windows

Status: experimental
Severity: medium
Log source: category file_event, product windows
Author: Leonardo Gasparini
Source: github.com/SigmaHQ/sigma

Detects file creation indicators associated with the Mini Shai-Hulud supply-chain campaign targeting TanStack npm packages and others such as mistralai, uipath, etc reported on early May 2026.

MITRE ATT&CK coverage

Tactic	Techniques
Initial Access	`T1195.002` Supply Chain Compromise: Compromise Software Supply Chain
Execution	`T1059.007` Command and Scripting Interpreter: JavaScript
Persistence	`T1554` Compromise Host Software Binary

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 11: FileCreate

Rule body

title: TanStack Supply-Chain Attack File Creation Indicators - Windows
id: 8a3f2c1e-5d7b-4e9a-b6c8-1f2a3d4e5f6a
status: experimental
description: Detects file creation indicators associated with the Mini Shai-Hulud supply-chain campaign targeting TanStack npm packages and others such as mistralai, uipath, etc reported on early May 2026.
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.initial-access
    - attack.t1195.002
    - attack.execution
    - attack.t1059.007
    - attack.persistence
    - attack.t1554
    - detection.emerging-threats
logsource:
    category: file_event
    product: windows
detection:
    selection_malware_files:
        TargetFilename|endswith:
            - '\router_init.js'
            - '\tanstack_runner.js'
    selection_persistence_claude_vscode:
        TargetFilename|endswith:
            - '\.claude\router_runtime.js'
            - '\.vscode\router_runtime.js'
    condition: 1 of selection_*
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: `condition`

1 of selection_*

Stage 1: `selection_malware_files`

selection_malware_files:
    TargetFilename|endswith:
        - '\router_init.js'
        - '\tanstack_runner.js'

Stage 2: `selection_persistence_claude_vscode`

selection_persistence_claude_vscode:
    TargetFilename|endswith:
        - '\.claude\router_runtime.js'
        - '\.vscode\router_runtime.js'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`TargetFilename`	ends_with	`\.claude\router_runtime.js` `\.vscode\router_runtime.js` `\router_init.js` `\tanstack_runner.js`	`field:"TargetFilename" kind:ends_with`