registry / Staged payload carrier / beast-agent / 2.57.0

beast-agent@2.57.0

Ultra-fast local agent shell for Windows.

AI Security Review

scanned 1mo ago · by lpm-firewall-ai

No concrete automatic malware chain or self-dependency was established. However, unauthenticated remote script installation combined with shell-capable agent features is a real unresolved dangerous capability.

Static reason

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

Trigger

A user installs a skill, enables an MCP server, requests an agent command, or runs the SearXNG feature.

Impact

A compromised skill source or unsafe agent instruction could lead to code execution in the user's account context.

Mechanism

Remote script installation and AI-agent command execution.

AI rationale

Evidence

package.jsonscripts/fix-electron.jssrc/agent/store.jssrc/agent/tools.jssrc/agent/mcp.jssrc/agent/searxng.jsnode_modules/electron/dist%APPDATA%\beast\skills\<id>%APPDATA%\beast\mcp.json%APPDATA%\beast\searxng

Network endpoints5

skills.algokod.combeastagent-skills.web.appraw.githubusercontent.com/algokodcom/beast-agent/main/store/skills.jsonraw.githubusercontent.com/searxng/searxng/master/requirements.txtgithub.com/searxng/searxng/archive/refs/heads/master.zip

Decision evidence

public snapshot

AI called this Suspicious at 87.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

The install lifecycle runs a repair script that can remove Electron runtime files.
The skill store fetches community content and writes allowed script files into the local skills directory without integrity verification.
The agent exposes arbitrary PowerShell command execution with execution-policy bypass.
Configured MCP servers can launch configured commands.
The optional SearXNG installer downloads and installs remote Python packages.

Evidence against

No runtime dependency on beast-agent itself was found.
The postinstall repair is limited to the Electron dependency directory.
Remote skill and SearXNG installation paths are activated through product features rather than automatically at install.
No source-backed credential theft or covert exfiltration path was confirmed.

Behavioral surface

Source

ChildProcessCryptoDynamicRequireEnvironmentVarsFilesystemNetworkShellWebSocket

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'); ... 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

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'); ... 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

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