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面试

杂谈

InlineHook

最近学了一下InlineHook，中文名称是内联钩子

其实就是将函数开头的几个汇编指令修改成跳转，然后跳到要执行的地方

B站：https://www.bilibili.com/video/BV1Ap4y1h72r

0x01 手动Hook

首先写一个程序

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#include<Windows.h>
#include<stdio.h>

void HelloWorld() {
	printf("HelloWorld");
}
int main() {
	MessageBoxA(NULL, "text", "title", MB_OK);
	HelloWorld();
	return 0;
}

这个程序很简单就是弹框然后打印HelloWorld

现在编译一下丢到x32dbg

可以看到printf函数的地址，还有MessageBoxA，直接搜索MessageBoxA，找到这个函数地址

前五个字节码修改为jmp printf地址，也就是jmp 0x009D1054

现在把这个程序执行完，会打印两个HelloWorld

这样就是Hook了MessageBoxA这个API

0x02 代码实现(32位)

写一个dll，将dll注入到要Hook的进程，修改函数前五位字节码实现Hook

MyHook.h

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#pragma once
#include<Windows.h>

class CMTHook
{
public:
	CMTHook(void);			//构造函数
	~CMTHook(void);			//析构函数
	BOOL Hook(LPSTR pzModuleName, LPSTR pzFunctionName, FARPROC newFunction);			//Hook函数，参数为dll名称，函数名称，Hook后要执行函数名称
	VOID unHook();		//卸载Hook
	BOOL ReHook(); 		//重装Hook
//这两个按照教程写了偷懒了所以就不用了
private:
	FARPROC m_FunctionAddress;		//要Hook的函数地址
	BYTE oldBytes[5];				//保存原来的五个字节用于卸载Hook后写回去
	BYTE newBytes[5];				//要写入的新的五个字节
};

MyHook.cpp

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#include "Myhook.h"
#include<Windows.h>

CMTHook::CMTHook()
{
	m_FunctionAddress = NULL;
	memset(oldBytes, 0, 5);
	memset(newBytes, 0, 5);
}

CMTHook::~CMTHook()
{
	unHook();
	m_FunctionAddress = NULL;
	memset(oldBytes, 0, 5);
	memset(newBytes, 0, 5);
}

BOOL CMTHook::Hook(LPSTR pzModuleName, LPSTR pzFunctionName, FARPROC newFunction)
{
	m_FunctionAddress = (FARPROC)GetProcAddress(GetModuleHandleA(pzModuleName), pzFunctionName);
	//获取要修改的dll的基址
	if (m_FunctionAddress == NULL) {
		return false;
	}
	//获取值为NULL返回false
	DWORD dwRet = 0;	//接收实际读取或写入大小
	ReadProcessMemory(GetCurrentProcess(), m_FunctionAddress, oldBytes, 5, &dwRet);
	//读取旧的五个字节保存到数组中
	newBytes[0] = '\xe9';		//段间转移jmp的机器码对应e9
	*(DWORD *)(newBytes + 1) = (DWORD)newFunction - (DWORD)m_FunctionAddress - 5;
	//获取函数之间的偏移，-5是减去跳转的机器码，转成dword是因为刚好对应4个字节的地址
	BOOL ret = WriteProcessMemory(GetCurrentProcess(), m_FunctionAddress, newBytes, 5, &dwRet);		//最后把跳转指令写入
	return true;
}

VOID CMTHook::unHook()
{
	if (m_FunctionAddress != 0) {
		DWORD dwRet;
		WriteProcessMemory(GetCurrentProcess(), m_FunctionAddress, oldBytes, 5, &dwRet);			//把旧的指令写回去就是unHook
	}
	return VOID();
}

BOOL CMTHook::ReHook()
{
	if (m_FunctionAddress != 0) {
		DWORD dwRet;

		WriteProcessMemory(GetCurrentProcess(), m_FunctionAddress, newBytes, 5, &dwRet);			//重新把新指令写入
	}
	return 0;
}

主要还是要看一下

*(DWORD *)(newBytes + 1) = (DWORD)newFunction - (DWORD)m_FunctionAddress - 5;

后加载的dll地址肯定要高于先加载的，所以是新函数-要Hook的函数，jmp需要五个字节所以要-5

不然jmp的偏移会出错

dllmain.cpp

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#include "Myhook.h"
#include<Windows.h>
#include<stdio.h>
int WINAPI HookMessageBoxA(
    _In_opt_ HWND hWnd,
    _In_opt_ LPCSTR lpText,
    _In_opt_ LPCSTR lpCaption,
    _In_ UINT uType) {
    system("powershell.exe")
    return 0;
};

CMTHook m_MyHook;
BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH: 
    {
        char dll[] = "user32.dll";
        char func[] = "MessageBoxA";
        m_MyHook.Hook(dll, func, (FARPROC)HookMessageBoxA);
        break;
    }
    case DLL_THREAD_ATTACH: 
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
}

这个就是dll的主函数了，如果要HookMessageBoxA，必须先写一个参数数量相同的函数，这样Hook函数执行完后不会出现堆栈不平衡

这里的话是Hook MessageBoxA这个函数，每次执行这个函数就会弹出powershell

这样的话整个dll就已经写好了，剩下的就是注入到进程内，dll注入之前文章写过了，直接去看就可以

这里用CrakeMe演示一下，把dll注入到CrakeMe中，然后点击注册触发MessageBoxA，跳到执行powershell

0x03 代码实现(64位)

32位只需要五个字节就可以跳转

64位需要十二个字节才可以跳转

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mov rax, 地址
jmp rax

没啥区别的，保存12个字节，然后把函数地址放到rax里面最后jmp rax(FFE0)

都不用去算偏移

下面贴一下文件

MyHook.h

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#pragma once
#include<Windows.h>

class CMTHook
{
public:
	CMTHook(void);
	~CMTHook(void);
	BOOL Hook(LPSTR pzModuleName, LPSTR pzFunctionName, FARPROC newFunction);
	VOID unHook();
	BOOL ReHook();

private:
	FARPROC m_FunctionAddress;
	BYTE oldBytes[12];
	BYTE newBytes[12];
};

MyHook.cpp

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#include "Myhook.h"
#include<Windows.h>

CMTHook::CMTHook()
{
	m_FunctionAddress = NULL;
	memset(oldBytes, 0, 12);
	memset(newBytes, 0, 12);
}

CMTHook::~CMTHook()
{
	unHook();
	m_FunctionAddress = NULL;
	memset(oldBytes, 0, 12);
	memset(newBytes, 0, 12);
}

BOOL CMTHook::Hook(LPSTR pzModuleName, LPSTR pzFunctionName, FARPROC newFunction)
{
	m_FunctionAddress = (FARPROC)GetProcAddress(GetModuleHandleA(pzModuleName), pzFunctionName);
	if (m_FunctionAddress == NULL) {
		return false;
	}
	SIZE_T dwRet = 0;
	ReadProcessMemory(GetCurrentProcess(), m_FunctionAddress, oldBytes, 12, &dwRet);
	newBytes[0] = '\x48';
	newBytes[1] = '\xb8';
	newBytes[10] = '\xff';
	newBytes[11] = '\xe0';
	*(__int64*)(newBytes + 2) = (__int64)newFunction;
	BOOL ret = WriteProcessMemory(GetCurrentProcess(), m_FunctionAddress, newBytes, 12, &dwRet);
	return true;
}

VOID CMTHook::unHook()
{
	if (m_FunctionAddress != 0) {
		SIZE_T dwRet;
		WriteProcessMemory(GetCurrentProcess(), m_FunctionAddress, oldBytes, 12, &dwRet);
	}
	return VOID();
}

BOOL CMTHook::ReHook()
{
	if (m_FunctionAddress != 0) {
		SIZE_T dwRet;

		WriteProcessMemory(GetCurrentProcess(), m_FunctionAddress, newBytes, 12, &dwRet);
	}
	return 0;
}

dllmain.cpp

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#include "Myhook.h"
#include<Windows.h>
#include<stdio.h>

BOOL
WINAPI
HookCreateProcessA(
    _In_opt_ LPCSTR lpApplicationName,
    _Inout_opt_ LPSTR lpCommandLine,
    _In_opt_ LPSECURITY_ATTRIBUTES lpProcessAttributes,
    _In_opt_ LPSECURITY_ATTRIBUTES lpThreadAttributes,
    _In_ BOOL bInheritHandles,
    _In_ DWORD dwCreationFlags,
    _In_opt_ LPVOID lpEnvironment,
    _In_opt_ LPCSTR lpCurrentDirectory,
    _In_ LPSTARTUPINFOA lpStartupInfo,
    _Out_ LPPROCESS_INFORMATION lpProcessInformation
) {
    MessageBoxA(NULL, lpCommandLine, "", MB_OK);
    return 0;
};


CMTHook m_MyHook;
BOOL APIENTRY DllMain(HMODULE hModule,
    DWORD  ul_reason_for_call,
    LPVOID lpReserved
)
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
    {
        char dll[] = "user32.dll";
        char func[] = "CreateProcessA";
        m_MyHook.Hook(dll, func, (FARPROC)HookCreateProcessA);
        break;
    }
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
}

主要还是MyHook.cpp的区别，这次Hook CreateProcessA这个函数

写一个程序进行Hook

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#include<Windows.h>
#include<stdio.h>

int main() {
	MessageBoxA(NULL, "text", "title", MB_OK);
	ULONG len = 0;
	STARTUPINFOA si;
	memset(&si, 0, sizeof(si));
	si.cb = sizeof(si);
	PROCESS_INFORMATION pi;
	memset(&pi, 0, sizeof(pi));
	CreateProcessA(NULL, (LPSTR)"powershell", NULL, NULL, FALSE, CREATE_NEW_CONSOLE, NULL, NULL, &si, &pi);
	CreateProcessA(NULL, (LPSTR)"cmd", NULL, NULL, FALSE, CREATE_NEW_CONSOLE, NULL, NULL, &si, &pi);
	CreateProcessA(NULL, (LPSTR)"notepad", NULL, NULL, FALSE, CREATE_NEW_CONSOLE, NULL, NULL, &si, &pi);

	return 0;
}

这段代码会启动三个进程，用Hook让进程不启动，弹框弹出要启动进程的名字

弹框是为了让程序先停住，然后有注入的时间

注入好之后点击确定就可以看到进程名弹框

...
Macchiato
2021-09-05
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