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beast-agent@2.38.0: Malicious npm security report (Block) | LPM Firewall

registry / beast-agent / 2.38.0

beast-agent@2.38.0

Ultra-fast local agent shell for Windows.

AI Security Review

scanned 27d ago · by lpm-firewall-ai

At runtime, the application can transfer credentials read from OpenCode authentication storage to opencode.ai. Its agent can also fetch and execute an unsigned remote driver installer.

Static reason

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

Trigger

Using the one-click Zen setup or invoking computer-use when its driver is absent.

Impact

A stored credential may be disclosed to a remote service, and a changed remote installer can execute arbitrary code as the user.

Mechanism

Credential reuse and remote script execution through agent tooling.

Attack narrative

The one-click setup searches OpenCode credential locations, extracts a key, and uses it in an authorization header for requests to opencode.ai. Separately, a failed computer-use driver launch starts an automatic installer that pipes remotely fetched script content directly into PowerShell or Bash. The same application gives its model tool loop command execution capability, so remote content and agent actions create a material code-execution and credential-transfer surface.

AI rationale

This package contains concrete credential transfer and unsigned remote-script execution paths, not merely inert tooling. The npm lifecycle hook itself is not the primary issue, but the runtime behavior warrants blocking.

Evidence

src/main.jssrc/agent/computeruse.jssrc/agent/tools.js.local/share/opencode/auth.json.config/opencode/auth.jsonAppData/Roaming/opencode/auth.jsonAppData/Local/opencode/auth.json

Source & flagged code

17 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

•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 } = require('./agent/engine'); ... L68: if (res.ok) { L69: const j = await res.json(); L70: const v = String(j.version || '').trim(); ... L79: if (win && !win.isDestroyed()) { L80: 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

1152const zipPath = path.join(outDir, `beast-${stamp}.zip`); L1153: /* zip yoksa PowerShell Compress-Archive ile */ L1154: await new Promise((resolve, reject) => {

High

Shell

Package source references shell execution.

src/main.jsView on unpkg · L1152

5const 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'); ... L68: if (res.ok) { L69: const j = await res.json(); L70: const v = String(j.version || '').trim(); ... L79: if (win && !win.isDestroyed()) { L80: win.webContents.send('agent:event', { type: 'update', ...updateState, current: app.getVersion() });

High

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 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'); ... L107: ['-NoProfile', '-NoExit', '-Command', '-'], L108: { cwd: cwd || process.cwd(), windowsHide: true, env: envWithPathPrefix() } L109: ); ... L125: proc.stdin.unref && proc.stdin.unref(); L126: proc.stdout.unref && proc.stdout.unref(); L127: proc.stderr.unref && proc.stderr.unref();

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/mt5_bridge.pyView file

•path = src/agent/scripts/mt5_bridge.py kind = build_helper sizeBytes = 14080 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

src/agent/scripts/mt5_bridge.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

Lines 1132-1172javascript

1132 return String(t || '').replace(/[*_`~\[\]]/g, '');

1133}

1134

1135/* ---------- #6 tek tık yedek: %APPDATA%\beast → ŞİFRELİ .beastbak ----------

1136 Format: [BEASTBAK1][beastCode:15][iv:16][AES-256-CBC(zip)]

1137 Anahtar Beast Kodu'ndan (scrypt) türetilir; dosya adında kod görünür —

1138 yedeğin hangi makineye ait olduğu belli olur, başka makinede geri yüklenemez. */

1139

1140const BACKUP_MAGIC = 'BEASTBAK1';

1141

1142function backupKey(beastCode) {

1143 return crypto.scryptSync(String(beastCode), 'beast-backup-v1', 32, { N: 32768, maxmem: 128 * 1024 * 1024 });

1144}

1145

1146async function createBackup() {

1147 try {

1148 const stamp = new Date().toISOString().replace(/[:T]/g, '-').slice(0, 19);

1149 const outDir = path.join(app.getPath('desktop'), 'Beast-Backups');

1150 fs.mkdirSync(outDir, { recursive: true });

1151 const code = String(settings.beastCode || '');

1152 const zipPath = path.join(outDir, `beast-${stamp}.zip`);

1153 /* zip yoksa PowerShell Compress-Archive ile */

1154 await new Promise((resolve, reject) => {

High

Shell

Package source references shell execution.

src/main.jsView on unpkg · L1152

1155 const { execFile } = require('child_process');

1156 execFile(

1157 'powershell.exe',

1158 [

1159 '-NoProfile', '-Command',

1160 `Compress-Archive -Path '${APP_DIR}\\*' -DestinationPath '${zipPath}' -Force`,

1161 ],

1162 { timeout: 180000, windowsHide: true },

1163 (err) => (err ? reject(err) : resolve())

1164 );

1165 });

1166 /* zip → AES-256-CBC ile şifrele, Beast Kodu'nu başlığa yaz */

1167 const iv = crypto.randomBytes(16);

1168 const cipher = crypto.createCipheriv('aes-256-cbc', backupKey(code), iv);

1169 const enc = Buffer.concat([cipher.update(fs.readFileSync(zipPath)), cipher.final()]);

1170 fs.unlinkSync(zipPath);

1171 const outPath = path.join(outDir, `beast-yedek-${code}-${stamp}.beastbak`);

1172 const header = Buffer.concat([