malware-dev/4-dll-injection/my-dll/main.cpp

#include <Windows.h>

BOOL WINAPI DllMain(HINSTANCE hModule, DWORD reason, LPVOID lpvReserved) {
    switch (reason) {
    case DLL_PROCESS_ATTACH:
        MessageBoxW(NULL, L"WHO GOES THERE", L"KAW KAW KAW", MB_ICONEXCLAMATION);
        break;
    }

    return TRUE;
}