registry / Remote code execution / beast-agent / 2.12.0

beast-agent@2.12.0

Ultra-fast local agent shell for Windows.

AI Security Review

scanned 2mo ago · by lpm-firewall-ai

The package contains concrete remote code acquisition and execution features, including automatic runtime downloads. They appear to be product features rather than a covert malware chain, but the exposed capability remains materially risky.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review; previous stored version diff introduced dangerous source

Trigger

A user or agent invokes app installation, Python-backed tools, or the command tool.

Impact

A malicious app source or unsafe agent instruction can execute code with the desktop user's privileges.

Mechanism

Remote code installation and unrestricted local command execution.

AI rationale

Evidence

package.jsonscripts/fix-electron.jssrc/agent/tools.jssrc/agent/apps.jsnode_modules/electron/distnode_modules/electron/path.txt%APPDATA%\beast\py%APPDATA%\beast\apps

Network endpoints4

npmmirror.com/mirrors/electron/www.python.org/ftp/python/3.12.8/python-3.12.8-embed-amd64.zipgithub.comregistry.npmjs.org

Decision evidence

public snapshot

AI called this Suspicious at 89.0% confidence as Dangerous Capability with low false-positive risk.

Evidence for warning

The postinstall hook runs a repair script that deletes Electron files and reruns Electron's installer with a third-party mirror fallback.
Runtime tools download and unpack an embedded Python runtime, then install Python packages automatically.
The agent exposes an unrestricted PowerShell command tool.
App installation accepts npm packages or GitHub repositories and immediately requires their JavaScript entrypoint.

Evidence against

No self-dependency is declared in the manifest.
The reviewed install hook targets the package's Electron dependency rather than an AI-agent control surface.
No source evidence showed secret harvesting or covert exfiltration by the package itself.

Behavioral surface

Source

ChildProcessCryptoDynamicRequireEnvironmentVarsFilesystemNativeBindingsNetworkShellWebSocket

Supply chain

HighEntropyStrings

Source & flagged code

19 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 = 11

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 } = require('./agent/engine'); ... L61: if (res.ok) { L62: const j = await res.json(); L63: const v = String(j.version || '').trim(); ... L72: if (win && !win.isDestroyed()) { L73: 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

•matchType = previous_version_dangerous_delta matchedPackage = beast-agent@2.4.5 matchedIdentity = npm:YmVhc3QtYWdlbnQ:2.4.5 similarity = 0.659 summary = stored previous version shares package body but lacks this dangerous source file

Critical

Previous Version Dangerous Delta

This package version adds a dangerous source file absent from the previous stored version; route for source-aware review.

src/main.jsView on unpkg

1133const zipPath = path.join(outDir, `beast-${stamp}.zip`); L1134: /* zip yoksa PowerShell Compress-Archive ile */ L1135: await new Promise((resolve, reject) => {

High

Shell

Package source references shell execution.

src/main.jsView on unpkg · L1133

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

15const os = require('os'); L16: const { spawn, execFile, execSync } = require('child_process'); L17: L18: const REQS_URL = 'https://raw.githubusercontent.[redacted].txt'; L19: const PKG_URL = 'https://github.[redacted].zip'; ... L25: function beastAppDir() { L26: if (process.env.BEAST_DATA) return process.env.BEAST_DATA; L27: return process.env.APPDATA

High

Same File Env Network Execution

A single source file combines environment access, network access, and code or shell execution; review context before blocking.

src/agent/searxng.jsView on unpkg · L15

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 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

•matchType = normalized_sha256 matchedPackage = beast-agent@1.2.3 matchedPath = src/agent/store.js matchedIdentity = npm:YmVhc3QtYWdlbnQ:1.2.3 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.

src/agent/store.jsView on unpkg

src/agent/tools.jsView file

5const path = require('path'); L6: const https = require('https'); L7: const { execFile } = require('child_process'); L8: const { spawn } = require('child_process'); ... L103: ['-NoProfile', '-NoExit', '-Command', '-'], L104: { cwd: cwd || process.cwd(), windowsHide: true, env: envWithPathPrefix() } L105: ); ... L121: proc.stdin.unref && proc.stdin.unref(); L122: proc.stdout.unref && proc.stdout.unref(); L123: proc.stderr.unref && proc.stderr.unref(); ... L193: native exe hata verirse gerçek kod işaret satırına yazılır */ L194: sess.proc.stdin.write(`$global:LASTEXITCODE = 0\n${cmd}${cmd.endsWith('\n') ? '' : '\n'}Write-Output "${marker}"\n`);

Critical

Download Execute

Source downloads or fetches remote code and executes it.

src/agent/tools.jsView on unpkg · L5

src/agent/computeruse.jsView file

8L9: Sürücü: https://github.com/trycua/cua — `cua-driver mcp` stdio MCP sunucusu; L10: el yazımı minimal JSON-RPC 2.0 client'ı (mcp.js ile aynı çerçeve). L11: Binary yoksa eski PowerShell backend'ine düşer (yalnız koordinat + foreground). L12: ... L49: otomatik kurulum asla çalışmaz (tests dahil). */ L50: return !String(process.env.BEAST_CUA_DRIVER_CMD || '').trim(); L51: } ... L56: return new Promise((resolve) => { L57: execFile(driverCmd(), ['--version'], { timeout: 10000, windowsHide: true }, (err, stdout) => { L58: const res = { ... L70: function runInstaller(cb) {

High

Sandbox Evasion Gated Capability

Source gates dangerous network, credential, or execution behavior behind CI, host, platform, time, or geo fingerprint checks.

src/agent/computeruse.jsView on unpkg · L8

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

29L30: /* güncelleme modu: çalışan Beast"i kapat (dosya kilidi EBUSY vermesin) → npm güncelle (görünür ilerleme) → yeniden başlat.\r\n Bu komut güncelleme butonu tarafından GÖRÜNÜR bir ... L31: detached: true,

High

Runtime Package Install

Package source invokes a package manager install command at runtime.

bin/beast-agent.js#virtual:normalized:round1View on unpkg · L29

src/agent/scripts/websearch.pyView file

•path = src/agent/scripts/websearch.py kind = build_helper sizeBytes = 7808 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

src/agent/scripts/websearch.pyView on unpkg

src/agent/bus.jsView file

•matchType = normalized_sha256 matchedPackage = beast-agent@1.2.3 matchedPath = src/agent/bus.js matchedIdentity = npm:YmVhc3QtYWdlbnQ:1.2.3 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.

src/agent/bus.jsView on unpkg

src/agent/config.jsView file

•matchType = normalized_sha256 matchedPackage = beast-agent@1.2.3 matchedPath = src/agent/config.js matchedIdentity = npm:YmVhc3QtYWdlbnQ:1.2.3 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.

src/agent/config.jsView on unpkg

Source & flagged code

19 flagged · loading source

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

Findings

3 Critical12 High6 Medium6 Low

CriticalDownload Executesrc/agent/tools.js

CriticalTrigger Reachable Dangerous Capabilitysrc/main.js

CriticalPrevious Version Dangerous Deltasrc/main.js

HighInstall Time Lifecycle Scriptspackage.json

HighChild Processbin/beast-agent.js

HighShellsrc/main.js

HighSame File Env Network Executionsrc/agent/searxng.js

HighEntrypoint Foreign Package Code Overwritesrc/agent/store.js

HighCommand Output Exfiltrationsrc/main.js

HighSandbox Evasion Gated Capabilitysrc/agent/computeruse.js

HighRuntime Package Installbin/beast-agent.js#virtual:normalized:round1

Affected versions and remediation

This report applies to beast-agent@2.12.0.

See all versions of beast-agent for other recorded verdicts.

Review the evidence and your use of beast-agent@2.12.0 before allowing it. Restrict the permissions described in this report.
Choose an independently verified alternative or release. This report does not establish that other versions are safe.

Evidence last updated: 2026-09-07 15:51:03.075Z (UTC).

Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Runtime surface

Behavioral surface

Source & flagged code