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@firedmosquito831/my-claude-code@6.78.0: Malicious npm security | LPM Firewall

registry / @firedmosquito831/my-claude-code / 6.78.0

@firedmosquito831/my-claude-code@6.78.0

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 26d ago · by lpm-firewall-ai

A global npm install automatically retrieves and executes remote installer code. It can also install current desktop release artifacts and alter user application locations.

Static reason

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

Trigger

npm install -g @firedmosquito831/my-claude-code

Impact

A repository or release change can execute arbitrary code on the installing machine and modify user-level software.

Mechanism

Postinstall remote script execution and latest-release artifact installation

Attack narrative

The postinstall hook runs during global installation and calls the runtime installer. That installer constructs commands that download a script from the repository's mutable main branch and immediately executes it through sh or PowerShell with execution-policy bypass. It also downloads artifacts from the mutable latest release and runs platform installers. The package snapshot therefore does not contain the code ultimately executed at install time.

AI rationale

This is an automatic lifecycle-driven remote code execution chain with broad machine mutation. Checksum verification of artifacts does not protect the separately piped remote script or pin either source to an immutable trusted version.

Evidence

package.jsonbin/postinstall.jsbin/runtime-install.js~/Applications/<app>global npm bin/my-claude-code

Network endpoints2

/FiredMosquito831/my-claude-code/main/scripts

Source & flagged code

8 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@6.77.0 matchedPath = bin/my-claude-code.js matchedIdentity = npm:[redacted]:6.77.0 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

•matchType = malicious_source_fingerprint_signature signature = 0feae99d531fadaf signatureType = suspicious_hashes sourceLabel = final_verdict:malicious matchedPackage = @firedmosquito831/my-claude-code@6.77.0 matchedPath = bin/my-claude-code.js matchedIdentity = npm:[redacted]:6.77.0 similarity = 1.000 shingleOverlap = 4 summary = package final verdict is malicious

High

Known Malware Source Fingerprint Signature

Source fingerprint signature matches a known malicious package signature; 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

bin/runtime-install.jsView file

•matchType = normalized_sha256 matchedPackage = @firedmosquito831/my-claude-code@6.77.0 matchedPath = bin/runtime-install.js matchedIdentity = npm:[redacted]:6.77.0 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/runtime-install.jsView on unpkg

Source & flagged code

8 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

bin/runtime-install.jsView file

•matchType = normalized_sha256 matchedPackage = @firedmosquito831/my-claude-code@6.77.0 matchedPath = bin/runtime-install.js matchedIdentity = npm:[redacted]:6.77.0 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/runtime-install.jsView on unpkg