c++ - Inject a dll file to UWP

Question

I make simple a UWP app and a desktop app. This code inject the ConsoleApplication1.dll file to the desktop is normal, but I cannot inject to UWP app. I have two question : Why this code cannot inject to UWP app? and How fix it?

This code inject a DLL file

#include "pch.h"
#include <vector>
#include <string>
#include <windows.h>
#include <Tlhelp32.h>

using std::vector;
using std::string;

int main(void)
{
while (true)
{
    vector<string>processNames;
    PROCESSENTRY32 pe32;
    pe32.dwSize = sizeof(PROCESSENTRY32);
    HANDLE hTool32 = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, NULL);
    BOOL bProcess = Process32First(hTool32, &pe32);
    if (bProcess == TRUE)
    {
        while ((Process32Next(hTool32, &pe32)) == TRUE)
        {
            processNames.push_back(pe32.szExeFile);
            if (strcmp(pe32.szExeFile, "ConsoleApplication4.exe") == 0 || strcmp(pe32.szExeFile, "UWP.exe") == 0)
            {
                printf("Hooked %s, %d 
", pe32.szExeFile, pe32.th32ProcessID);
                char* DirPath = new char[MAX_PATH];
                char* FullPath = new char[MAX_PATH];
                GetCurrentDirectory(MAX_PATH, DirPath);
                sprintf_s(FullPath, MAX_PATH, "%s\..\ConsoleApplication1\ConsoleApplication1.dll", DirPath);
                FILE *pFile;
                if (fopen_s(&pFile, FullPath, "r") || !pFile)
                {
                    OutputDebugString("[Hook] File name or file does not exist");
                    OutputDebugString(FullPath);
                    return -1;
                }
                fclose(pFile);

                HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pe32.th32ProcessID);
                LPVOID LoadLibraryAddr = (LPVOID)GetProcAddress(GetModuleHandle("kernel32.dll"), "LoadLibraryA");
                LPVOID LLParam = (LPVOID)VirtualAllocEx(hProcess, NULL, strlen(FullPath), MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);

                bool result = WriteProcessMemory(hProcess, LLParam, FullPath, strlen(FullPath), NULL);
                CreateRemoteThread(hProcess, NULL, NULL, (LPTHREAD_START_ROUTINE)LoadLibraryAddr, LLParam, NULL, NULL);

                CloseHandle(hProcess);
                delete[] DirPath;
                delete[] FullPath;

                OutputDebugString("[Hook] Hooked success");

                system("pause");

                return 0;
            }
        }
    }
    CloseHandle(hTool32);
}
return 0;
}

Thanks

Answer 1

DLL injecting UWP apps is no different than injecting Win32 programs; the same techniques and generic DLL injectors will work for UWP apps. However, if one simply tries to inject any regular DLL into a UWP app, the DLL likely won't load. The reason for this is because the ALL APPLICATION PACKAGES group must have read & execute permissions for the DLL being injected.

To set these permissions manually: right click on the DLL, go into properties, go to the security tab, hit Edit, click Add, type "ALL" in the dialog that pops up and hit okay. On English systems, this will add ALL APPLICATION PACKAGES to the list of permissions with read/execute enabled by default; for non-English systems, the group will be named something different.

https://www.unknowncheats.me/forum/general-programming-and-reversing/177183-basic-intermediate-techniques-uwp-app-modding.html

Thanks