registry / Malware / @decoopus/claude-setup / 1.0.2

@decoopus/claude-setup@1.0.2

OpenSSF/OSV Malicious Advisory

imported 2d ago · by OpenSSF/OSV

OpenSSF/OSV advisory MAL-2026-18054 confirms this npm version as malicious.

Advisory

MAL-2026-18054

Source

OpenSSF Malicious Packages via OSV

Summary

Malicious code in @decoopus/claude-setup (npm)

Details

The CLI prompts the user for an Anthropic API key (sk-ant-...) and writes it, together with a hardcoded gateway base URL https://api-anthropic.help, into Claude Desktop's configuration in every location it can reach: Windows registry policies at HKCU\SOFTWARE\Policies\Claude via reg.exe, macOS managed preferences for com.anthropic.claudefordesktop via `defaults write`, claude_desktop_config.json, and all profile JSON files under configLibrary. The domain api-anthropic.help is a lookalike of api.anthropic.com and is not operated by Anthropic, so after setup every Claude Desktop request — including the user's API key and all prompt/response traffic — is transparently relayed to an attacker-controlled endpoint. The package also kills running Claude.exe/Claude processes and recursively deletes Session Storage, Local Storage, IndexedDB, cookies, and host-creds/custom3p/probe-cache files across standard, Claude-3p, and Windows Store MSIX install locations, then relaunches Claude Desktop so the next authentication flow is forced through the attacker gateway. A comment references a prior gateway host api.vokes.in that the package explicitly overwrites, and the shipped DEFAULT_MODELS list contains fabricated model names (claude-fable-5-1, claude-opus-5-5, claude-sonnet-5-5, claude-haiku-5-5) under a 'Claude Max 20x · API Usage Billing' label that do not correspond to Anthropic's product lineup, consistent with an iterated phishing/relay operation. ## Source: ghsa-malware (e9c714cd8ba4dd623d5570083b71cdbc76991794df7b81833c282793dddfcbbd) Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

References

OpenSSF/OSV advisory ADVISORY PACKAGE PACKAGE

Independent LPM AI assessment

Clean

Independent AI assessment: clean. LPM AI assessed this version as clean; the assessments disagree.

The source shows an explicit, user-invoked gateway setup flow, with the endpoint displayed and the gateway key supplied by the user. The manifest has no install lifecycle hook, and the configuration writes match the stated package purpose.

Static reason

No blocking static signals were detected.

Trigger

The user invokes the CLI and provides or enters a gateway API key.

Impact

Claude Desktop requests are configured to use that gateway; the source presents this as the package's setup purpose.

Mechanism

The CLI displays the gateway URL and writes the selected URL and supplied key into Claude configuration.

AI rationale

Network endpoints1

api-anthropic.help

Independent scan evidence

public snapshot

AI called this Clean at 91.0% confidence as Benign with low false-positive risk.

Evidence for AI clean decision

package.json exposes bin/cli.js as the CLI entry point and lists only a start script; it has no install lifecycle hook.
The CLI identifies its purpose as configuring Claude Desktop for a third-party inference gateway and displays the gateway URL before applying configuration.
The CLI prompts for a gateway API key when none is supplied and aborts if it is empty.
The supplied URL and gateway key are written to Claude configuration as gateway settings; this is consistent with the stated setup function.

Evidence against

The default gateway is https://api-anthropic.help, a package-selected endpoint, though the CLI displays it and accepts a replacement URL.

Behavioral surface

Source

ChildProcessEnvironmentVarsFilesystemShell

Supply chain

UrlStrings

ManifestNo manifest risk signals triggered.

scanned 1 file(s), 23.3 KB of source, external domains: api-anthropic.help

Source & flagged code

6 flagged

package.jsonView file

Lines 1-33json

2 "name": "@decoopus/claude-setup",

3 "version": "1.0.2",

4 "description": "One-command setup for Claude Desktop with custom 3P inference gateway",

5 "main": "bin/cli.js",

6 "bin": {

7 "claude-setup": "bin/cli.js",

8 "claude-desktop-setup": "bin/cli.js"

9 },

10 "files": [

11 "bin",

12 "README.md",

13 "LICENSE"

High

Suspicious Lifecycle Evidence

package.json exposes bin/cli.js as the CLI entry point and lists only a start script; it has no install lifecycle hook.

package.jsonView on unpkg · L5

14 ],

15 "scripts": {

16 "start": "node ./bin/cli.js"

17 },

18 "keywords": [

19 "claude",

High

Suspicious Lifecycle Evidence

package.json exposes bin/cli.js as the CLI entry point and lists only a start script; it has no install lifecycle hook.

package.jsonView on unpkg · L15

20 "claude-desktop",

21 "anthropic",

22 "setup",

23 "gateway",

24 "3p-inference",

25 "api-anthropic"

26 ],

27 "author": "decoopus",

28 "license": "MIT",

29 "publishConfig": {

30 "access": "public"

31 }

32}

bin/cli.jsView file

Lines 1-37javascript

1#!/usr/bin/env node

3/**

4 * Claude Desktop 3P Gateway Auto-Configurator

5 * Automates configuring Claude Desktop to use third-party inference endpoints.

6 *

7 * Base URL: https://api-anthropic.help

8 */

10const fs = require

Source & flagged code

6 flagged · loading source

package.jsonView file

5"main": "bin/cli.js", "bin": { "claude-setup": "bin/cli.js", "claude-desktop-setup": "bin/cli.js" }, "files": [ "bin", "README.md", "LICE

High

Suspicious Lifecycle Evidence

package.json exposes bin/cli.js as the CLI entry point and lists only a start script; it has no install lifecycle hook.

package.jsonView on unpkg · L5

15"scripts": { "start": "node ./bin/cli.js" }, "keywords": [

High

Suspicious Lifecycle Evidence

package.json exposes bin/cli.js as the CLI entry point and lists only a start script; it has no install lifecycle hook.

package.jsonView on unpkg · L15

bin/cli.jsView file

17https://api-anthropic.help'; const DEFAULT_AUTH_SCHEME = 'bearer'; const DEFAULT_MODELS = [ { name: 'claude-fable-5-1', labelOverride: 'Claude

High

Ai Review Evidence

The CLI identifies its purpose as configuring Claude Desktop for a third-party inference gateway and displays the gateway URL before applying configuration.

Findings

6 High1 Medium3 Low

HighSuspicious Lifecycle Evidencepackage.json

HighAi Review Evidencebin/cli.js

MediumEnvironment Vars

LowScripts Present

LowFilesystem

LowUrl Strings

Affected versions and remediation

This report applies to @decoopus/claude-setup@1.0.2.

See all versions of @decoopus/claude-setup for other recorded verdicts.

Avoid installing @decoopus/claude-setup@1.0.2. Remove it from direct dependencies and check your lockfile for transitive copies.
Choose an independently verified alternative or release. This report does not establish that other versions are safe.
If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.

Evidence last updated: 2026-10-20 18:50:08.132Z (UTC).

Source advisory published: 2026-10-19 21:47:42.000Z (UTC).

Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.

OpenSSF/OSV Malicious Advisory

Independent LPM AI assessment

Independent scan evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Related packages

Other malware packages

Source & flagged code

Related packages

Other malware packages