browser-extension-reverse

> ⚠️ AUTHORIZED USE ONLY

> This skill is for educational purposes or authorized security assessments only.

> You must have explicit, written permission from the system owner before using this tool.

> Misuse of this tool is illegal and strictly prohibited.

> Mandatory confirmation gate

> Before running any command that probes, exploits, changes, persists on, extracts data from, or attempts credential access against a target:

> 1. Ask the user to state the exact target URL, IP, account, or resource.

> 2. Ask the user to confirm written authorization and the permitted scope.

> 3. Show the exact command(s) and explain their expected effect.

> 4. Wait for explicit confirmation in the current conversation.

>

> Without that confirmation, remain read-only and provide defensive guidance only. Prefer a sandbox, disposable VM, or controlled lab.

Browser Extension Reverse Engineering

When to Use

• Auditing a browser extension's behavior and permissions in an authorized review.
• Investigating how an extension handles credentials or sensitive page data.

适用场景

• Chrome/Edge MV2/MV3 扩展分析
• Firefox 扩展
• 恶意扩展 IOC、供应链扩展投毒调查
• 扩展实现的签名/加密/代理逻辑还原

工作流

1. 包体

□ crx 解压 / 从 profile 取扩展目录
□ manifest.json：permissions、host_permissions、background、content_scripts
□ 评估过度权限（<all_urls>、webRequest、debugger）

2. 逻辑

□ service_worker / background 入口
□ content_script 注入点与世界（isolated）
□ chrome.storage / IndexedDB 密钥
□ 与 `js-reverse` 相同：Observe 网络与消息传递（runtime.sendMessage）

3. 动态

□ 开发者模式加载解压目录
□ chrome://extensions 检查错误
□ DevTools 附加 service worker
□ 必要时 Frida/浏览器 CDP（jshookmcp）

工具链

| 工具 | 用途 |

|------|------|

| 解压/jq | manifest |

| Chrome DevTools | worker 调试 |

| js-reverse 工具链 | 深度 JS |

| YARA | 恶意扩展规则 |

参考

• references/extension-analysis.md
• field-journal 扩展恢复相关条目
• ../js-reverse/ ../malware-analysis/

路由上下文

上游: MASTER R30

下游: 复杂混淆 JS → js-reverse；投毒调查 → supply-chain / malware

任务完成自检

• [ ] 是否列出权限面与入口脚本？
• [ ] 是否还原关键数据流？
• [ ] Checklist？

Limitations

• Extension stores update frequently; findings can go stale.
• Dynamic analysis requires a profile isolated from personal accounts.

> Adapted from zhaoxuya520/reverse-skill (MIT).