398 lines
12 KiB
Markdown
398 lines
12 KiB
Markdown
# JS Hook 技术大全
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## 概述
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Hook 是 JS 逆向中最核心的技术之一。通过劫持/拦截 JS 原生函数或对象属性，可以捕获加密函数的
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输入输出、Cookie 的生成过程、网络请求的参数构造等关键信息。
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## 注入方式
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### 通过 MCP 注入（推荐）
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```
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[js-reverse] inject_before_load(script=HookScript)
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→ 在页面脚本加载前注入，确保 Hook 在目标代码之前生效
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[js-reverse] evaluate_script(function=HookScript)
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→ 在当前页面上下文执行，适合页面已加载后的动态注入
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```
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### 通过浏览器控制台注入
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在 chrome-devtools MCP 中使用：
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```
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[chrome-devtools] evaluate_script(function=HookScript)
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```
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## Hook 模板库
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### 1. Cookie Setter Hook
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**用途**：监控所有 Cookie 写入操作，定位动态 Cookie 生成逻辑
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```javascript
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(function() {
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let cookieTemp = '';
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Object.defineProperty(document, 'cookie', {
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set: function(val) {
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console.log('[Hook] Cookie Set:', val);
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if (val.indexOf('目标cookie名') !== -1) {
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console.log('[Hook] ★ 目标Cookie捕获:', val);
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console.trace('[Hook] Cookie 调用栈');
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}
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cookieTemp = val;
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return val;
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},
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get: function() {
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return cookieTemp;
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}
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});
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})();
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```
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### 2. XHR Hook
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**用途**：拦截所有 XMLHttpRequest 请求，捕获完整请求参数
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```javascript
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(function() {
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const _open = XMLHttpRequest.prototype.open;
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const _send = XMLHttpRequest.prototype.send;
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const _setHeader = XMLHttpRequest.prototype.setRequestHeader;
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XMLHttpRequest.prototype.open = function(method, url) {
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this._hookMethod = method;
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this._hookUrl = url;
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this._hookHeaders = {};
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console.log('[Hook] XHR Open:', method, url);
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return _open.apply(this, arguments);
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};
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XMLHttpRequest.prototype.setRequestHeader = function(name, value) {
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this._hookHeaders[name] = value;
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return _setHeader.apply(this, arguments);
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};
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XMLHttpRequest.prototype.send = function(body) {
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console.log('[Hook] XHR Send:', {
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method: this._hookMethod,
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url: this._hookUrl,
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headers: this._hookHeaders,
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body: body
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});
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if (this._hookUrl.indexOf('目标接口') !== -1) {
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console.log('[Hook] ★ 目标请求捕获');
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console.trace('[Hook] 请求调用栈');
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}
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return _send.apply(this, arguments);
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};
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})();
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```
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### 3. Fetch Hook
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**用途**：拦截 fetch API 请求
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```javascript
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(function() {
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const _fetch = window.fetch;
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window.fetch = function(url, options) {
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console.log('[Hook] Fetch:', url, options);
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if (typeof url === 'string' && url.indexOf('目标接口') !== -1) {
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console.log('[Hook] ★ 目标Fetch捕获');
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console.trace('[Hook] Fetch 调用栈');
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}
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return _fetch.apply(this, arguments);
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};
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})();
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```
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### 4. $.ajax Hook（jQuery 场景）
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**用途**：拦截 jQuery AJAX 请求，捕获加密参数
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```javascript
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(function() {
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if (typeof $ === 'undefined' || typeof $.ajax === 'undefined') return;
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const _ajax = $.ajax;
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$.ajax = function(options) {
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if (typeof options === 'object') {
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console.log('[Hook] $.ajax:', {
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url: options.url,
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method: options.type || options.method,
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data: options.data,
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headers: options.headers
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});
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if (options.url && options.url.indexOf('目标接口') !== -1) {
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console.log('[Hook] ★ 目标Ajax捕获');
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if (options.data && options.data.m) {
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console.log('[Hook] 加密参数 m:', options.data.m);
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}
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}
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}
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return _ajax.apply(this, arguments);
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};
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// 同时 Hook ajaxSetup
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if ($.ajaxSetup) {
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const _setup = $.ajaxSetup;
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$.ajaxSetup = function(options) {
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console.log('[Hook] $.ajaxSetup:', options);
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return _setup.apply(this, arguments);
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};
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}
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})();
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```
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### 5. eval / Function Hook
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**用途**：捕获动态生成和执行的代码
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```javascript
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(function() {
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// eval Hook
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const _eval = window.eval;
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window.eval = function(code) {
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console.log('[Hook] eval 调用, 代码长度:', (typeof code === 'string') ? code.length : 'N/A');
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if (typeof code === 'string' && code.length < 5000) {
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console.log('[Hook] eval 代码:', code.substring(0, 500));
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}
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return _eval.apply(this, arguments);
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};
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// Function 构造器 Hook
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const _Function = Function;
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const handler = {
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construct(target, args) {
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const body = args[args.length - 1];
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console.log('[Hook] new Function, body 长度:', body ? body.length : 0);
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if (body && body.indexOf('目标关键词') !== -1) {
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console.log('[Hook] ★ 目标 Function 捕获:', body.substring(0, 500));
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}
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return new target(...args);
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},
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apply(target, thisArg, args) {
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const body = args[args.length - 1];
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console.log('[Hook] Function(), body 长度:', body ? body.length : 0);
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return target.apply(thisArg, args);
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}
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};
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window.Function = new Proxy(_Function, handler);
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})();
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```
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### 6. JSON.parse Hook
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**用途**：捕获 JSON 解析操作，常用于响应数据解密场景
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```javascript
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(function() {
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const _parse = JSON.parse;
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JSON.parse = function(text) {
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const result = _parse.apply(this, arguments);
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console.log('[Hook] JSON.parse:', typeof text === 'string' ? text.substring(0, 200) : text);
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return result;
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};
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})();
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```
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### 7. JSON.stringify Hook
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**用途**：捕获 JSON 序列化操作，常在签名前执行
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```javascript
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(function() {
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const _stringify = JSON.stringify;
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JSON.stringify = function(obj) {
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const result = _stringify.apply(this, arguments);
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console.log('[Hook] JSON.stringify:', result ? result.substring(0, 200) : result);
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return result;
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};
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})();
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```
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### 8. atob / btoa Hook
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**用途**：捕获 Base64 编解码操作
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```javascript
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(function() {
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const _atob = window.atob;
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const _btoa = window.btoa;
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window.atob = function(str) {
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const result = _atob(str);
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console.log('[Hook] atob:', str.substring(0, 100), '→', result.substring(0, 100));
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return result;
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};
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window.btoa = function(str) {
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const result = _btoa(str);
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console.log('[Hook] btoa:', str.substring(0, 100), '→', result.substring(0, 100));
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return result;
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};
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})();
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```
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### 9. setTimeout / setInterval Hook
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**用途**：监控定时器调用，识别反调试和周期性操作
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```javascript
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(function() {
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const _setTimeout = window.setTimeout;
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const _setInterval = window.setInterval;
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window.setTimeout = function(fn, delay) {
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const fnStr = typeof fn === 'function' ? fn.toString().substring(0, 200) : String(fn).substring(0, 200);
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// 过滤 debugger 反调试
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if (fnStr.indexOf('debugger') !== -1) {
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console.log('[Hook] setTimeout 拦截 debugger，已跳过');
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return -1;
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}
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return _setTimeout.apply(this, arguments);
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};
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window.setInterval = function(fn, delay) {
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const fnStr = typeof fn === 'function' ? fn.toString().substring(0, 200) : String(fn).substring(0, 200);
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if (fnStr.indexOf('debugger') !== -1) {
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console.log('[Hook] setInterval 拦截 debugger，已跳过');
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return -1;
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}
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return _setInterval.apply(this, arguments);
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};
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})();
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```
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### 10. WebSocket Hook
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**用途**：拦截 WebSocket 消息
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```javascript
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(function() {
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const _WebSocket = window.WebSocket;
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window.WebSocket = function(url, protocols) {
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console.log('[Hook] WebSocket 连接:', url);
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const ws = new _WebSocket(url, protocols);
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const _send = ws.send.bind(ws);
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ws.send = function(data) {
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console.log('[Hook] WS 发送:', data);
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return _send(data);
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};
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ws.addEventListener('message', function(event) {
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console.log('[Hook] WS 接收:', event.data);
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});
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return ws;
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};
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window.WebSocket.prototype = _WebSocket.prototype;
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})();
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```
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### 11. window 属性访问 Hook（蜜罐检测）
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**用途**：监控对 window 属性的访问，识别蜜罐检测
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```javascript
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(function() {
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const handler = {
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get(target, prop, receiver) {
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if (['__selenium', '__webdriver_script_fn', '__driver_evaluate',
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'$cdc_asdjflasutopfhvcZLmcfl_', 'callPhantom', '_phantom'].includes(prop)) {
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console.log('[Hook] ★ 蜜罐属性访问:', prop);
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return undefined;
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}
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return Reflect.get(target, prop, receiver);
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}
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};
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// 注意：直接代理 window 风险较大，仅在需要时使用
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})();
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```
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### 12. Canvas 指纹 Hook
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**用途**：拦截 Canvas 指纹采集
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```javascript
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(function() {
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const _toDataURL = HTMLCanvasElement.prototype.toDataURL;
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HTMLCanvasElement.prototype.toDataURL = function() {
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console.log('[Hook] Canvas toDataURL 调用');
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console.trace('[Hook] Canvas 调用栈');
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return _toDataURL.apply(this, arguments);
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};
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const _toBlob = HTMLCanvasElement.prototype.toBlob;
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HTMLCanvasElement.prototype.toBlob = function() {
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console.log('[Hook] Canvas toBlob 调用');
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return _toBlob.apply(this, arguments);
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};
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})();
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```
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### 13. Navigator 属性 Hook
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**用途**：伪装浏览器指纹
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```javascript
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(function() {
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Object.defineProperty(navigator, 'webdriver', {
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get: () => false
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});
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Object.defineProperty(navigator, 'plugins', {
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get: () => [1, 2, 3, 4, 5]
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});
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Object.defineProperty(navigator, 'languages', {
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get: () => ['zh-CN', 'zh', 'en']
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});
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})();
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```
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## 组合 Hook 模板
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### 通用逆向分析 Hook（一键注入）
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```javascript
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(function() {
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console.log('[Hook] ========== 通用逆向Hook已注入 ==========');
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// 1. Cookie 监控
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let _cookie = document.cookie;
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Object.defineProperty(document, 'cookie', {
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set(v) { console.log('[Cookie] Set:', v); _cookie += '; ' + v; },
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get() { return _cookie; }
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});
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// 2. XHR 监控
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const _xhrOpen = XMLHttpRequest.prototype.open;
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const _xhrSend = XMLHttpRequest.prototype.send;
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XMLHttpRequest.prototype.open = function(m, u) { this._m = m; this._u = u; return _xhrOpen.apply(this, arguments); };
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XMLHttpRequest.prototype.send = function(b) { console.log('[XHR]', this._m, this._u, b); return _xhrSend.apply(this, arguments); };
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// 3. Fetch 监控
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const _fetch = window.fetch;
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window.fetch = function() { console.log('[Fetch]', ...arguments); return _fetch.apply(this, arguments); };
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// 4. debugger 拦截
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const _si = window.setInterval;
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window.setInterval = function(fn, d) {
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if (typeof fn === 'function' && fn.toString().indexOf('debugger') > -1) return -1;
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return _si.apply(this, arguments);
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};
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console.log('[Hook] ========== Hook注入完成 ==========');
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})();
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```
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## MCP 注入最佳实践
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1. **使用 `inject_before_load`**：确保 Hook 在目标代码之前生效
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2. **使用 `console.log` 输出**：通过 `list_console_messages` 收集结果
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3. **使用 `console.trace`**：在关键点输出调用栈
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4. **避免覆写原型链的 toString**：防止被反检测代码发现
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5. **使用 Proxy 代替直接覆写**：更隐蔽，不改变 `typeof` 结果
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