C++跳转钩子[Windows]

Question

嗯，我想学习有关钩子的知识，但似乎在互联网上找到的教程无法运行。

我想做的是一个跳跃钩子，在C++中。

代码如下：

void DoHook(DWORD* Address, DWORD* Hook, DWORD pid){   

    HANDLE Server = OpenProcess(PROCESS_VM_OPERATION | PROCESS_VM_WRITE | PROCESS_VM_READ , false, pid );
    Address = (DWORD*)Address + 0x18;
    DWORD OldProt;     
    DWORD HookOffset = (DWORD*)Hook-(DWORD*)Address-5;
    std::wcout << "Hook on address" << std::hex << Address<< std::endl;
    std::wcout << "Hook offset is " << std::hex << HookOffset << std::endl;

    if ( ! VirtualProtectEx(Server, (LPVOID) Address, 40,PAGE_EXECUTE_READWRITE, &OldProt) ) {
        ErrorExit(L"VirtualProtectEx");
    };

    char* CharPointer = (char*) Address;
    BYTE newdata[5]={0xE9}; 
    BYTE x;
    int i = 1;
    while ( HookOffset > 0 ) {
        x = HookOffset & 0xff;
        newdata[5-i] = x;
        i++;
        HookOffset >>= 8;
    }
    std::wcout << "Bytes " <<newdata[0] << " " << newdata[1] << " " << newdata[2] << " " << newdata[3] << " " << newdata[4] << std::endl;

    DWORD newdatasize = sizeof(newdata);
    if ( ! WriteProcessMemory(Server,Address,(LPCVOID*)newdata,newdatasize,NULL) ) {
        ErrorExit(L"WriteProcessMemory");
    }

//  VirtualProtect((void*) Address, 40, 0x40, &OldProt);

    return;
}

下面是一些输出文本：

Process ID is 2764 // PID of the app that's being hooked
Function address is 00A81190 // this is the function i'm doing the jump to
Entry point is 00080000 // for the app that's being hooked
Hook on address 00080060 // for the app that's being hooked
Hook offset is 28048e // HookAddress - FunctionAddress - 5
Bytes e9 0 28 4 8e // this is the jump i'm planning to do
Press any key to continue . . .

但是，应用程序不会更新。

Answer 1

您必须以管理员身份运行程序，才能拥有写入进程内存的正确权限。下面是我的x86绕道函数，我已经测试和使用了很多次

bool Detour32(char* src, char* dst, const intptr_t len)
{
    if (len < 5) return false;

    DWORD  curProtection;
    VirtualProtect(src, len, PAGE_EXECUTE_READWRITE, &curProtection);

    intptr_t  relativeAddress = (intptr_t)(dst - (intptr_t)src) - 5;

    *src = (char)'\xE9';
    *(intptr_t*)((intptr_t)src + 1) = relativeAddress;

    VirtualProtect(src, len, curProtection, &curProtection);
    return true;
}

src是您想要放置钩子的地址，dst是您想要跳转到的地址。len是您要用jmp销毁的字节数。jmp是5个字节，所以如果你要销毁超过5个字节的指令，你需要将5个以上的“偷来的字节”拷贝到你的目标中，以确保它们被执行。