registry / AI-agent capability abuse / beast-agent / 2.63.3

beast-agent@2.63.3

Ultra-fast local agent shell for Windows.

AI Security Review

scanned 1mo ago · by lpm-firewall-ai

The package is a high-risk, persistent remote-capable AI agent with arbitrary command execution and an install-time downloader, but the observed behavior is aligned with its desktop-agent function and lacks a concrete malicious chain. It should be warned rather than blocked.

Static reason

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

Trigger

npm installation activates the Electron repair hook; launching the installed app activates login persistence, agent tools, and configured bridges.

Impact

A compromised configured model or authorized messaging channel could direct commands on the Windows host; the lifecycle hook adds supply-chain exposure through the Electron mirror.

Mechanism

Electron runtime repair, automatic startup registration, and LLM-controlled PowerShell execution.

AI rationale

Evidence

package.jsonscripts/fix-electron.jssrc/main.jssrc/agent/tools.js

Network endpoints1

npmmirror.com/mirrors/electron/

Decision evidence

public snapshot

AI called this Suspicious at 86.0% confidence as Unknown with medium false-positive risk.

Evidence for warning

The install hook repairs Electron by deleting its runtime directory and running its installer, with an alternate mirror.
After the user launches the app from an npm installation, it registers automatic login and creates desktop and Start Menu shortcuts.
The agent exposes a run_command tool that sends supplied commands to PowerShell with execution-policy bypass.
Configured WhatsApp, Telegram, and Discord bridges start automatically when the application starts.

Evidence against

The lifecycle hook targets the package's Electron dependency rather than an AI-agent control surface.
Startup persistence occurs only when the user launches this first-party desktop application.
Sensitive credential and key files are explicitly blocked from the file-send path.
No self-dependency, eval-like loader, or confirmed covert credential exfiltration was found.

Behavioral surface

Source

ChildProcessCryptoDynamicRequireEnvironmentVarsFilesystemNetwork

Source & flagged code

27 flagged

package.jsonView file

•scripts.postinstall = node scripts/fix-electron.js --soft

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node scripts/fix-electron.js --soft

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg

bin/beast-agent.jsView file

7L8: const { spawn, spawnSync } = require('child_process'); L9: const path = require('path');

High

Child Process

Package source references child process execution.

bin/beast-agent.jsView on unpkg · L7

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 14

High

Semantic Analysis Limited

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

bin/beast-agent.jsView on unpkg

7L8: const { spawn, spawnSync } = require('child_process'); L9: const path = require('path');

Medium

Dynamic Require

Package source references dynamic require/import behavior.

bin/beast-agent.jsView on unpkg · L7

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'); ... L70: if (res.ok) { L71: const j = await res.json(); L72: const v = String(j.version || '').trim(); ... L81: if (win && !win.isDestroyed()) { L82: 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

1264const zipPath = path.join(outDir, `beast-${stamp}.zip`); L1265: /* zip yoksa PowerShell Compress-Archive ile */ L1266: await new Promise((resolve, reject) => {

High

Shell

Package source references shell execution.

src/main.jsView on unpkg · L1264

•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

29function beastRoot() { L30: if (process.env.BEAST_DATA) return process.env.BEAST_DATA; L31: return process.env.APPDATA L32: ? path.join(process.env.APPDATA, 'beast') L33: : path.join(os.homedir(), 'AppData', 'Roaming', 'beast'); L34: } ... L167: if (!v) return null; L168: return Buffer.from(v.buffer, v.byteOffset, v.byteLength).toString('base64'); L169: }

Low

Weak Crypto

Package source references weak cryptographic algorithms.

src/agent/mem0.jsView on unpkg · L29

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'); ... L222: if (/\bnpm\s+init\b/i.test(raw) && !/(\s-y\b|\s--yes\b)/i.test(raw)) { L223: return '`npm init` sihirbazı soru sorar — `npm init -y` kullan ya da package.json\'u write_file ile yaz.'; L224: } ... L256: ['-NoProfile', '-NonInteractive', '-NoExit', '-ExecutionPolicy', 'Bypass', '-Command', '-'], L257: { cwd: cwd || process.cwd(), windowsHide: true, env: envWithPathPrefix() } L258: );

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