ProtectProcess.cpp

#include <Windows.h>
#include "aclapi.h"
#include <chrono>
#include <thread>

DWORD ProtectProcess(void)
{
    HANDLE hProcess = GetCurrentProcess();
    PACL pEmptyDacl;
    DWORD dwErr;

    pEmptyDacl = (PACL)malloc(sizeof(ACL));

    if (!InitializeAcl(pEmptyDacl, sizeof(ACL), ACL_REVISION))
    {
        dwErr = GetLastError();
    }
    else
    {
        dwErr = SetSecurityInfo(hProcess, SE_KERNEL_OBJECT,
            DACL_SECURITY_INFORMATION, NULL, NULL, pEmptyDacl, NULL);
    }

    free(pEmptyDacl);
    return dwErr;
}

int main()
{
    ShowWindow(GetConsoleWindow(), SW_HIDE);

    ProtectProcess();

    while (true) {
        std::this_thread::sleep_for(std::chrono::milliseconds(500));
    }
}