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@firedmosquito831/my-claude-code@6.73.1: Malicious npm security | LPM Firewall

registry / @firedmosquito831/my-claude-code / 6.73.1

@firedmosquito831/my-claude-code@6.73.1

My Claude Code (MCC): route Claude Code and other coding agents to any model provider through one local proxy with a dashboard. This npm package installs and launches the Python server.

AI Security Review

scanned 27d ago · by lpm-firewall-ai

A global npm install automatically retrieves and executes mutable remote shell or PowerShell code with the installing user's privileges. On desktop systems it can also install downloaded applications and remove macOS quarantine protection.

Static reason

One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review

Trigger

npm install -g @firedmosquito831/my-claude-code outside CI unless the opt-out is set.

Impact

A repository or delivery-path compromise can execute arbitrary code and modify the user's machine during installation.

Mechanism

Postinstall remote-code execution through curl-to-shell or PowerShell irm-to-scriptblock.

Attack narrative

Installing this package globally activates its postinstall hook. The hook calls an installer that fetches a script from the mutable main branch and immediately executes it through a shell or PowerShell with execution-policy bypass. The downloaded script is outside the reviewed package and is not pinned to a release digest or signature. On macOS, the same automatic path can replace an application under the user's Applications directory and clear its quarantine attribute. This gives a later repository or delivery compromise an install-time code-execution path.

AI rationale

The reviewed package creates an automatic install-time remote code-execution chain from mutable GitHub content and weakens macOS execution protection. The skip conditions do not remove the risk for ordinary global installs.

Evidence

package.jsonbin/postinstall.jsbin/runtime-install.js~/Applications/<downloaded-app>.app

Network endpoints2

Source & flagged code

6 flagged · loading source

package.jsonView file

•scripts.postinstall = node bin/postinstall.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node bin/postinstall.js

Medium

Ambiguous Install Lifecycle Script

Install-time lifecycle script is not statically allowlisted and needs review.

package.jsonView on unpkg

bin/my-claude-code.jsView file

19L20: const childProcess = require("node:child_process"); L21: const os = require("node:os");

High

Child Process

Package source references child process execution.

bin/my-claude-code.jsView on unpkg · L19

•matchType = normalized_sha256 matchedPackage = @firedmosquito831/my-claude-code@6.61.0 matchedPath = bin/my-claude-code.js matchedIdentity = npm:[redacted]:6.61.0 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

bin/my-claude-code.jsView on unpkg

bin/runtime-install.js#virtual:normalized:round1View file

17// The desktop half installs the OS-NATIVE shape: the Inno setup on Windows, L18: // the .dmg into ~/Applications on macOS, the .deb (or the tarball"s own\n// per-user installer) on Linux. That is deliberately not what `mcc-desktop`\n// does -- `mcc-desktop` dow... L19: // than to "unsupported". ... L32: desktop session, the desktop application in its native form: the setup.exe on L33: Windows, the .dmg into ~/Applications on macOS, the .deb (or the tarball"s\nper-user installer) on Linux. On a headless box, over SSH, in CI or in WSL\nwithout a display it install... L34: // launcher and its shortcuts. A headless box has nowhere to put them.

High

Same File Env Network Execution

A single source file combines environment access, network access, and code or shell execution; review context before blocking.

bin/runtime-install.js#virtual:normalized:round1View on unpkg · L17

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 2

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

bin/runtime-install.js#virtual:normalized:round1View on unpkg

Source & flagged code

6 flagged

package.jsonView file

Lines 8-48json

8 "repository": {

9 "type": "git",

10 "url": "git+https://github.com/FiredMosquito831/my-claude-code.git"

11 },

12 "bugs": {

13 "url": "https://github.com/FiredMosquito831/my-claude-code/issues"

14 },

15 "keywords": [

16 "claude-code",

17 "claude",

18 "anthropic",

19 "llm",

20 "proxy",

21 "router",

22 "openai",

23 "openrouter",

24 "coding-agent",

25 "mcc"

26 ],

27 "scripts": {

28 "postinstall": "node bin/postinstall.js"

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L28

Medium

Ambiguous Install Lifecycle Script

Install-time lifecycle script is not statically allowlisted and needs review.

package.jsonView on unpkg · L28

29 },

30 "bin": {

31 "mcc": "bin/my-claude-code.js"

32 },

33 "files": [

34 "bin/",

35 "README.md",

36 "LICENSE"

37 ],

38 "engines": {

39 "node": ">=18"

40 },

41 "os": [

42 "win32",

43 "darwin",

44 "linux"

45 ],

46 "publishConfig": {

47 "access": "public"

48 }

bin/my-claude-code.jsView file

Lines 1-39javascript

1#!/usr/bin/env node

2"use strict";

3

4// my-claude-code on npm is a launcher, not the server. The server is a Python

5// package installed with uv from the GitHub release (digest-verified by the

6// official install script). This file installs it when it is missing and then

7// hands over to the real command with every argument untouched.

8//

9// npx my-claude-code -> install if needed, then run mcc-server

10// npx @firedmosquito831/my-claude-code install -> install or update only

bin/runtime-install.js#virtual:normalized:round1View file

17// The desktop half installs the OS-NATIVE shape: the Inno setup on Windows, L18: // the .dmg into ~/Applications on macOS, the .deb (or the tarball"s own\n// per-user installer) on Linux. That is deliberately not what `mcc-desktop`\n// does -- `mcc-desktop` dow... L19: // than to "unsupported". ... L32: desktop session, the desktop application in its native form: the setup.exe on L33: Windows, the .dmg into ~/Applications on macOS, the .deb (or the tarball"s\nper-user installer) on Linux. On a headless box, over SSH, in CI or in WSL\nwithout a display it install... L34: // launcher and its shortcuts. A headless box has nowhere to put them.

High

Same File Env Network Execution

A single source file combines environment access, network access, and code or shell execution; review context before blocking.

bin/runtime-install.js#virtual:normalized:round1View on unpkg · L17

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 2

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

bin/runtime-install.js#virtual:normalized:round1View on unpkg