registry / AI-agent capability abuse / beast-agent / 2.61.0

beast-agent@2.61.0

Ultra-fast local agent shell for Windows.

AI Security Review

scanned 1mo ago · by lpm-firewall-ai

This is a high-capability agent package with automatic dependency mutation and unsandboxed command execution. The source does not establish a concrete malicious payload or the lifecycle self-dependency chain required for a block.

Static reason

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

Trigger

Installing the package activates the Electron repair hook; using agent command or skill features activates the runtime capabilities.

Impact

A configured or compromised agent session can run commands in its workspace, and remote skill content can change later agent behavior.

Mechanism

Automatic dependency repair plus model-driven PowerShell execution and remote skill file installation.

AI rationale

Evidence

package.jsonscripts/fix-electron.jssrc/agent/tools.jssrc/agent/store.jsnode_modules/electron/distnode_modules/electron/path.txt%APPDATA%\beast\skills\<id>workspace files selected by agent commands

Network endpoints4

npmmirror.com/mirrors/electron/skills.algokod.combeastagent-skills.web.appraw.githubusercontent.com/algokodcom/beast-agent/main/store/skills.json

Decision evidence

public snapshot

AI called this Suspicious at 84.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

Its install hook runs a repair script automatically.
The repair script deletes Electron runtime files and runs Electron's installer, with a mirror fallback.
The runtime agent launches PowerShell with execution-policy bypass and evaluates supplied command text.
The skill store fetches remote entries and writes their supplied files into the agent skill directory.

Evidence against

No self-dependency on beast-agent was found.
The install hook targets the package's Electron dependency rather than an AI-agent control surface.
No source path inspected showed credential harvesting or unsolicited data exfiltration.

Behavioral surface

Source

ChildProcessCryptoDynamicRequireEnvironmentVarsFilesystemNetworkShellWebSocket

Supply chain

HighEntropyStringsUrlStrings

ManifestNo manifest risk signals triggered.

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