wechat-bro@1.2.0
AI agent interface for WeChat Web — send/receive messages, manage contacts, upload media, transcribe voice
AI Security Review
scanned 2mo ago · by lpm-firewall-aiThe package does not show covert install-time malware, but it creates a serious unauthenticated control surface for a logged-in messaging account and includes deliberate impersonation behavior. This is a real security and abuse risk that warrants a warning rather than an upstream block.
Static reason
High-risk behavior combination matched malicious policy.; previous stored version diff introduced dangerous source
Trigger
A user starts and logs into the daemon, then an untrusted client reaches its WebSocket listener or the orchestrator is used.
Impact
An attacker on a reachable interface can control messaging and observe chat events from the logged-in account.
Mechanism
Unauthenticated WebSocket command dispatch and concealed AI message automation.
AI rationale
The package does not show covert install-time malware, but it creates a serious unauthenticated control surface for a logged-in messaging account and includes deliberate impersonation behavior. This is a real security and abuse risk that warrants a warning rather than an upstream block.
Evidence
src/ws-server.jssrc/cli.jsskills/wechat-bro/.pi/agents/wechat-individual-maintainer.agent.md~/.wechat-bro/cookies.json~/.wechat-bro/messages.jsonl
Network endpoints2
ws://localhost:9231wx.qq.com
Decision evidence
public snapshotAI called this Suspicious at 91.0% confidence as Critical Vulnerability with low false-positive risk.
Evidence for warning
- The daemon accepts WebSocket connections and dispatches arbitrary requested commands without authentication.
- Connected clients can invoke the dispatcher, including sending messages through the logged-in WeChat session.
- Bundled agent instructions explicitly tell the model to impersonate the account owner and conceal that it is AI.
- The package persists WeChat session cookies locally, increasing the impact of daemon compromise.
Evidence against
- The install hook only downloads Puppeteer's Chromium into the package data directory.
- Network and upload code is directed at the WeChat service used by the package.
- No self-dependency, hidden remote payload loader, or install-time agent-control-surface mutation was found.
Behavioral surface
ChildProcessEnvironmentVarsFilesystemNetworkWebSocket
HighEntropyStringsUrlStrings
Source & flagged code
7 flaggedpackage.jsonView file
•scripts.postinstall = node -e "const p=require('path'),o=require('os'),d=p.join(o.homedir(),'.wechat-bro','chromium');process.env.PUPPETEER_CACHE_DIR=d;const pup=require('puppeteer');(async()=>{try{awai...
Critical
Red Install Lifecycle Script
Install-time lifecycle script matches a deterministic static-gate block pattern.
package.jsonView on unpkg•scripts.postinstall = node -e "const p=require('path'),o=require('os'),d=p.join(o.homedir(),'.wechat-bro','chromium');process.env.PUPPETEER_CACHE_DIR=d;const pup=require('puppeteer');(async()=>{try{awai...
High
Install Time Lifecycle Scripts
Package defines install-time lifecycle scripts.
package.jsonView on unpkg•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 1
High
Semantic Analysis Limited
A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.
package.jsonView on unpkgFindings
2 Critical5 High3 Medium4 Low
CriticalRed Install Lifecycle Scriptpackage.json
CriticalPrevious Version Dangerous Deltasrc/cli.js
HighInstall Time Lifecycle Scriptspackage.json
HighChild Processsrc/upload.js
HighSame File Env Network Executionsrc/cli.js
HighRuntime Package Installsrc/cli.js
HighSemantic Analysis Limitedpackage.json
MediumNetwork
MediumEnvironment Vars
MediumStructural Risk Force Deep Review
LowScripts Present
LowFilesystem
LowHigh Entropy Strings
LowUrl Strings
Affected versions and remediation
This report applies to wechat-bro@1.2.0.
See all versions of wechat-bro for other recorded verdicts.
- Review the evidence and your use of wechat-bro@1.2.0 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: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.