[Win32] API Hook（2）在64位系统上的实现

末蓝、 2022-08-04 11:51 167阅读 0赞

本博文由CSDN博主zuishikonghuan所作，版权归zuishikonghuan所有，转载请注明出处：[http://blog.csdn.net/zuishikonghuan/article/details/47979603][http_blog.csdn.net_zuishikonghuan_article_details_47979603]

**本文是对上一篇的补充。关于apihook的原理，效果动画，代码分析，实现细节和32位hook的源码请见上一篇：**[\[Win32\] API Hook（1）在32位系统上的实现][Win32_ API Hook_1_32]

原理一样，就是换了个指令，jmp只能跳转32位大小，如果超过了就没法跳转了，所以更换指令，对于只会16位汇编和一点点Win32汇编的我，自然不懂amd64，百度到了一个，可惜原作者已不可考，谨对做出无私贡献的前辈奉上真诚的感谢！

mov rax,地址
    push rax
    ret

**这回指令设计的非常巧妙，利用了一个ret，因为已经把返回地址压入栈了，因此直接返回到了我们自己的函数里了，因为用的ret，不是ret(at)num，因此入栈的实参并没有清除，而原来的返回地址已经在call的时候就入栈了，因此也会保留，完美地实现了跳转。**

修改后dll源码如下，在win8.1 64位下完美实现了上一篇32位中的效果：

#include <stdio.h>
    #include <windows.h>
    
    unsigned char code[12];
    unsigned char oldcode[12];
    FARPROC addr;
    DWORD pid;
    
    int getpid()
    {
    	char buffer[255];
    	DWORD get = 255;
    	//判断环境是否为WOW64
    	BOOL isWOW64;
    	REGSAM p = KEY_READ;
    	IsWow64Process(GetCurrentProcess(), &isWOW64);
    	if (isWOW64)p |= KEY_WOW64_64KEY;
    
    	HKEY hKey;
    	if (RegCreateKeyEx(HKEY_LOCAL_MACHINE, TEXT("Software\\测试"), 0, NULL, 0, p, NULL, &hKey, NULL) != ERROR_SUCCESS){
    		return 0;
    	}
    	if (RegQueryValueExA(hKey, "Main_PID", 0, NULL, (BYTE*)buffer, &get) != ERROR_SUCCESS){
    		return 0;
    	}
    	return atoi(buffer);
    }
    
    HANDLE WINAPI MyOpenProcess(DWORD dwDesiredAccess, BOOL bInheritHandle, DWORD dwProcessId){
    	HANDLE handle;
    	if (getpid() == dwProcessId){
    		SetLastError(5);
    		return NULL;
    	}
    
    	DWORD old;
    	if (VirtualProtectEx(GetCurrentProcess(), addr, 12, PAGE_EXECUTE_READWRITE, &old)){
    		WriteProcessMemory(GetCurrentProcess(), addr, oldcode, 12, NULL);
    		VirtualProtectEx(GetCurrentProcess(), addr, 12, old, &old);
    	}
    	handle = OpenProcess(dwDesiredAccess, bInheritHandle, dwProcessId);
    	if (VirtualProtectEx(GetCurrentProcess(), addr, 12, PAGE_EXECUTE_READWRITE, &old)){
    		WriteProcessMemory(GetCurrentProcess(), addr, code, 12, NULL);
    		VirtualProtectEx(GetCurrentProcess(), addr, 12, old, &old);
    	}
    
    	return handle;
    }
    
    BOOL APIENTRY DllMain(HMODULE hModule,
    	DWORD  ul_reason_for_call,
    	LPVOID lpReserved
    	)
    {
    	switch (ul_reason_for_call)
    	{
    	case DLL_PROCESS_ATTACH:
    		addr = 0;
    		HMODULE hdll; hdll = LoadLibrary(TEXT("Kernel32.dll"));
    		addr = GetProcAddress(hdll, "OpenProcess");
    		if (addr){
    			code[0] = 0x48;
    			code[1] = 0xB8;
    			code[10] = 0x50;
    			code[11] = 0xC3;
    			long long a = (long long)MyOpenProcess;
    			RtlMoveMemory(code + 2, &a, 8);
    
    			DWORD old;
    			if (VirtualProtectEx(GetCurrentProcess(), addr, 12, PAGE_EXECUTE_READWRITE, &old)){
    				RtlMoveMemory(oldcode, addr, 12);
    				WriteProcessMemory(GetCurrentProcess(), addr, code, 12, NULL);
    				VirtualProtectEx(GetCurrentProcess(), addr, 12, old, &old);
    			}
    		}
    	case DLL_THREAD_ATTACH:
    	case DLL_THREAD_DETACH:
    	case DLL_PROCESS_DETACH:
    		break;
    	}
    	return TRUE;
    }

![Center][]

[http_blog.csdn.net_zuishikonghuan_article_details_47979603]: http://blog.csdn.net/zuishikonghuan/article/details/47979603
[Win32_ API Hook_1_32]: http://blog.csdn.net/zuishikonghuan/article/details/47976067
[Center]: /images/20220731/44520654200c4893883abbbb277a6dc7.png