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For this example, I chose to hook the MessageBoxW function. All of this resides in a DLL that will be injected into a process. This is the framework of a standard API hook. Int retValue = MessageBoxW(hWnd, lpText, lpCaption, uiType) VirtualProtect((LPVOID)pOrigMBAddress, SIZE, myProtect, NULL) Int WINAPI MyMessageBoxW(HWND hWnd, LPCWSTR lpText, LPCWSTR lpCaption, UINT uiType) VirtualProtect((LPVOID)pOrigMBAddress, SIZE, oldProtect, NULL) VirtualProtect((LPVOID)pOrigMBAddress, SIZE, GetProcAddress(GetModuleHandle( " user32.dll"),īYTE tempJMP = ĭWORD JMPSize = ((DWORD)newFunction - (DWORD)pOrigMBAddress - 5) INT APIENTRY DllMain(HMODULE hDLL, DWORD Reason, LPVOID Reserved) Int WINAPI MyMessageBoxW(HWND, LPCWSTR, LPCWSTR, UINT) ĭWORD oldProtect, myProtect = PAGE_EXECUTE_READWRITE Typedef int (WINAPI *pMessageBoxW)(HWND, LPCWSTR, LPCWSTR, UINT)
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Granted this is not the best method as I’ve mentioned, but this article is about using MS Detours for API hooking, so it’s not really too important.
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I chose to just leave it with the hook/unhook method, for the sake of code and debugging simplicity. There is a way around this by allocating memory elsewhere for the original function and setting up a hook within the hook to prevent having to constantly rewrite the detour. This technique that I will be using is rather rudimentary in the sense that the hooked API needs to be unhooked each time, which may cause conflicts with concurrency in multi-threaded programs.
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This is just one of various methods of API hooking – others include modifying the Import Address Table (link provided later), using proxy DLLs and manifest files, hooking through loading drivers in the kernel address space, and so on. Getting Started: Traditional API Hookingīefore getting into the Detours API, I will discuss a traditional approach to API hooking by overwriting the address of a function with that of a custom one.
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The code in the sample download is fully commented. For the sake of space, the code samples posted in this article are uncommented, but have explanations that lead into them or follow from them. Instructions for doing this can be found on the MSDN forums or elsewhere on the Internet. In order to successfully compile the code examples provided, you need to run the Makefile that comes with the Detours library and have it build the library files and everything else. I will be using the Microsoft Detours Library, which is free to download.
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This article requires an in-depth knowledge of C++ to fully comprehend. All of this is done before the real function is called, and in the end, after modifying/storing/extending the original function/parameters, control is handed back over to the original function until it is called again. By doing this, the parameters can be modified, the original program can be tricked if you choose to return an error code when really it should be successful, and so on. API hooking consists of intercepting a function call in a program and redirecting it to another function. In this article, I will be discussing the topic of API hooking.