registry / AI-agent capability abuse / beast-agent / 2.64.0

beast-agent@2.64.0

Ultra-fast local agent shell for Windows.

AI Security Review

scanned 1mo ago · by lpm-firewall-ai

This is a real Windows AI desktop agent, not an install-time trojan, but it autostarts, runs a privileged shell, loads remote skill scripts, and can trade or control the GUI with approval off by default. That dual-use surface is too large to call clean, especially with incomplete static coverage of this huge tree.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review

Trigger

npm install runs the Electron repair postinstall; launching beast-agent or beast starts the app and enables login autostart; chatting or using tools exercises shell, MCP, skills, and trading.

Impact

A compromised or unattended agent session can run commands, control the GUI, install executable skill files, and place MetaTrader orders on the user's machine.

Mechanism

Dual-use local AI agent with autostart, privileged shell, MCP spawn, and remote skill scripts

AI rationale

Evidence

package.jsonscripts/fix-electron.jssrc/main.jssrc/agent/tools.jssrc/agent/mcp.jssrc/agent/store.jssrc/agent/computeruse.jssrc/agent/defaulttools/mt5_emir/run.js

Network endpoints7

npmmirror.com/mirrors/electron/skills.algokod.combeastagent-skills.web.appraw.githubusercontent.com/algokodcom/beast-agent/main/store/skills.jsonregistry.npmjs.org/beast-agent/latestapi.telegram.org/bot

Decision evidence

public snapshot

AI called this Suspicious at 76.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

Install runs a postinstall script that downloads and repairs the Electron runtime from GitHub or npmmirror.
The first launch of a global install silently turns on Windows login autostart with a hidden start argument.
The agent keeps a PowerShell session with ExecutionPolicy Bypass so it can run user or model commands.
The MCP client starts user-configured server commands through cmd.exe on Windows.
A remote skills store can install script files including Python, PowerShell, batch, and JavaScript.
Computer-use drives the mouse and keyboard through PowerShell, and bundled MetaTrader tools spawn Python to place market orders.

Evidence against

No code writes Claude, Cursor, Copilot, or other third-party agent config files.
The postinstall path only repairs Electron; publish scripts only rewrite this package's own package.json.
Hosts in source are product LLM, search, npm, GitHub, Telegram, Discord, and first-party skill-store URLs, not a hidden dropper.
Scanner known-malware-source hits are this same large agent product, not a separate obfuscated payload.
Shell, MCP, trading, and messaging run after the user starts Beast Agent, not as silent install-time theft.

Source & flagged code

27 flagged

package.jsonView file

Lines 23-63json

23 "llm",

24 "openai"

25 ],

26 "main": "src/main.js",

27 "preferGlobal": true,

28 "bin": {

29 "beast-agent": "bin/beast-agent.js",

30 "beast": "bin/beast-agent.js"

31 },

32 "files": [

33 "src/**/*",

34 "assets/**/*",

35 "scripts/**/*",

36 "!**/__pycache__/**"

37 ],

38 "scripts": {

39 "start": "electron .",

40 "dist": "electron-builder --win nsis portable",

41 "test": "node --test \"tests/**/*.test.js\"",

42 "release": "node scripts/release.js",

43 "postinstall": "node scripts/fix-electron.js --soft",

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L43

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L43

44 "prepublishOnly": "node scripts/swap-electron.js deps",

45 "postpublish": "node scripts/swap-electron.js devdeps"

46 },

47 "devDependencies": {

48 "electron-builder": "^26.15.3"

49 },

50 "dependencies": {

51 "@huggingface/transformers": "3.7.5",

52 "@pdf-lib/fontkit": "^1.1.1",

53 "@whiskeysockets/baileys": "^7.0.0-rc14",

54 "@xenova/transformers": "^2.17.2",

55 "electron-updater": "^6.8.9",

56 "ffmpeg-static": "^5.3.0",

57 "imapflow": "^1.7.6",

58 "nodemailer": "^9.0.5",

59 "pdf-lib": "^1.17.1",

60 "pdf-parse": "^2.4.5",

61 "pdf-to-img": "^6.3.0",

62 "pdfjs-dist": "^5.6.205",

63 "pdfkit": "^0.20.1",

bin/beast-agent.jsView file

Lines 1-27javascript

1#!/usr/bin/env node

2'use strict';

4/* Beast Agent global npm launcher (`beast` short alias points to the same script):

5 `beast` / `beast-agent` → launches the app detached, frees the terminal immediately

6 `beast update` → installs the latest version from npm (run while the app is closed) */

8const { spawn, spawnSync } = require(

src/main.jsView file

5Trigger-reachable chain: manifest.main -> src/main.js L5: const fs = require('fs'); L6: const http = require('http'); L7: const dns = require('dns'); L8: const crypto = require('crypto'); ... L12: const OPENCODE_SESSION = 'beast-' + crypto.randomUUID(); L13: const { spawn } = require('child_process'); L14: const { Engine, OBSERVE_MARK, stripAiDashes } = require('./agent/engine'); ... L72: if (res.ok) { L73: const j = await res.json(); L74: const v = String(j.version || '').trim(); ... L83: if (win && !win.isDestroyed()) { L84: win.webContents.send('agent:event', { type: 'update', ...updateState, current: app.getVersion() });

Critical

Trigger Reachable Dangerous Capability

A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.

src/main.jsView on unpkg · L5

1281const zipPath = path.join(outDir, `beast-${stamp}.zip`); L1282: /* zip yoksa PowerShell Compress-Archive ile */ L1283: await new Promise((resolve, reject) => {

High

Shell

Package source references shell execution.

src/main.jsView on unpkg · L1281

•Manifest-reachable source captures an API credential, sends it to a fixed unofficial gateway, and persists that redirection in agent or shell configuration. src/main.js: sadece API key gir, modeller otomatik çekilir. Hepsi OpenAI-uyumlu. */ { id: 'opencode-zen', name: 'OpenCode Zen', baseUrl: 'https://opencode.ai/zen/v1', hint: 'Ücretsiz modeller var — anahtar: opencode.ai/auth' }, { id: 'opencode-go', name: 'OpenCode Go', baseUrl: 'https://opencode.ai/zen/go/v1', hint: 'Abonelik anahtarı' }, { id: 'openrouter', name: 'OpenRouter', baseUrl: 'https://openrouter.ai/api/v1', hint: 'openrouter.ai/keys' }, { id: 'openai', name: 'OpenAI', baseUrl: 'https://api.openai.com/v1', hint: 'platform.openai.com/api-keys' }, { id: 'anthropic', name: 'Anthropic', baseUrl: 'https://api.anthropic.com/v1', hi

src/agent/mem0.jsView file

Lines 9-49javascript

9 - Hibrit arama: 0.65*semantic(cosine) + 0.35*keyword (mem0 semantic+BM25 felsefesi)

10 Her fonksiyon degradasyonlu: embedding yoksa keyword, LLM yoksa hash+cos dedup.

src/agent/searxng.jsView file

Lines 1-35javascript

1'use strict';

3/* SearXNG — local metasearch integration (github.com/searxng/searxng)

4 SearXNG officially targets Linux/Docker; on Windows it crashes because of

5 `import pwd`. This module installs the real searxng (GitHub master) into

6 Beast's EMBEDDED Python + writes a pwd shim + runs it in the background on

7 127.0.0.1:8888. The search chain only uses the 'searxng' engine while it is UP.

9 CLI: beast searxng → install if needed + start

10 beast searxng status → status

src/agent/store.jsView file

•Manifest-reachable source resolves another installed package, overwrites its runtime code, and injects package-defined remote behavior. src/agent/store.js: const SITE_URL = 'https://sk[redacted]'; const SITE_FALLBACK_URL = 'https://beastagent-sk[redacted]'; const COMMUNITY_URL = 'https://raw.githubusercontent.com/algokodcom/beast-agent/main/store/skills.json'; const SKIP_DIRS = new Set(['node_modules', '.git', '__pycache__', '.drafts']); fs.writeFileSync(p, JSON.stringify(obj, null, 2)); fs.writeFileSync(target, String(content ?? ''), 'utf8');

High

Entrypoint Foreign Package Code Overwrite

Manifest-reachable source overwrites another installed package with package-defined remote behavior.

src/agent/store.jsView on unpkg

src/agent/tools.jsView file

5const path = require('path'); L6: const https = require('https'); L7: const dns = require('dns'); L8: const net = require('net'); L9: const { execFile } = require('child_process'); L10: const { spawn } = require('child_process'); ... L223: if (/\bnpm\s+init\b/i.test(raw) && !/(\s-y\b|\s--yes\b)/i.test(raw)) { L224: return '`npm init` sihirbazı soru sorar — `npm init -y` kullan ya da package.json\'u write_file ile yaz.'; L225: } ... L257: ['-NoProfile', '-NonInteractive', '-NoExit', '-ExecutionPolicy', 'Bypass', '-Command', '-'], L258: { cwd: cwd || process.cwd(), windowsHide: true, env: envWithPathPrefix() } L259: );

Critical

Download Execute

Source downloads or fetches remote code and executes it.

src/agent/tools.jsView on unpkg · L5

bin/beast-agent.js#virtual:normalized:round1View file

44} else { L45: try { spawnSync("pkill", ["-f", "node_modules/beast-agent"], { stdio: "ignore" }); } catch {} L46: } ... L57: This command is run by the update button inside a VISIBLE cmd window; L58: it also works from a terminal — npm install output streams on screen. */ L59: if (process.argv[2] === "update") {

High

Runtime Package Install

Package source invokes a package manager install command at runtime.

bin/beast-agent.js#virtual:normalized:round1View on unpkg · L44

src/agent/defaulttools/mt5_m15_m5/m15m5.pyView file

•path = src/agent/defaulttools/mt5_m15_m5/m15m5.py kind = build_helper sizeBytes = 1937 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

src/agent/defaulttools/mt5_m15_m5/m15m5.pyView on unpkg

src/agent/mcp.jsView file

•matchType = normalized_sha256 matchedPackage = beast-agent@2.44.2 matchedPath = src/agent/mcp.js matchedIdentity = npm:YmVhc3QtYWdlbnQ:2.44.2 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High