win32

#include <Windows.h>
#include <WinSafer.h>
#include <stdio.h>
#include <sddl.h>

bool _IsNewProcessLaunched()
{
    // Create the restricted token.

    SAFER_LEVEL_HANDLE hLevel = NULL;
    if (!SaferCreateLevel(SAFER_SCOPEID_USER, SAFER_LEVELID_NORMALUSER, SAFER_LEVEL_OPEN, &hLevel, NULL))
    {
        return false;
    }

    HANDLE hRestrictedToken = NULL;
    if (!SaferComputeTokenFromLevel(hLevel, NULL, &hRestrictedToken, 0, NULL))
    {
        SaferCloseLevel(hLevel);
        return false;
    }

    SaferCloseLevel(hLevel);

    // Set the token to medium integrity.

    TOKEN_MANDATORY_LABEL tml = { 0 };
    tml.Label.Attributes = SE_GROUP_INTEGRITY;
    // alternatively, use CreateWellKnownSid(WinMediumLabelSid) instead...
    if (!ConvertStringSidToSid(TEXT("S-1-16-8192"), &(tml.Label.Sid)))
    {
        CloseHandle(hRestrictedToken);
        return false;
    }

    if (!SetTokenInformation(hRestrictedToken, TokenIntegrityLevel, &tml, sizeof(tml) + GetLengthSid(tml.Label.Sid)))
    {
    LocalFree(tml.Label.Sid);
    CloseHandle(hRestrictedToken);
    return false;
    }

    LocalFree(tml.Label.Sid);

    // Create startup info
    WCHAR lp[] = L"winsta0\default";
    STARTUPINFO si = { 0 };
    si.cb = sizeof(si);
    si.lpDesktop = lp;

    PROCESS_INFORMATION pi = { 0 };

    // Get the current executable's name
    TCHAR exePath[MAX_PATH + 1] = { 0 };
    GetModuleFileName(NULL, exePath, MAX_PATH);

    // Start the new (non-elevated) restricted process
    if (!CreateProcessAsUser(hRestrictedToken, exePath, NULL, NULL, NULL, TRUE, NORMAL_PRIORITY_CLASS, NULL, NULL, &si, &pi))
    {
        CloseHandle(hRestrictedToken);
        return false;
    }

    CloseHandle(hRestrictedToken);
    CloseHandle(pi.hThread);
    CloseHandle(pi.hProcess);

    return true;
}

void main()
{
    _IsNewProcessLaunched();

    getchar();
}

相关链接：Removing Administrator Privilages from Process

"S-1-16-8192" 是指中等完整性级别。 见：2.4.2.4 Well-Known SID Structures

SID介绍见： SID Components