https://secret.club/2021/01/20/diet-process.html

#include <ntdll.h>
#include <stdio.h>

int main() {
    HANDLE job = nullptr;
    NtCreateJobObject(&job,
                      MAXIMUM_ALLOWED,
                      nullptr);

    NtAssignProcessToJobObject(job,
                               NtCurrentProcess());

    JOBOBJECT_EXTENDED_LIMIT_INFORMATION limits;
    limits.ProcessMemoryLimit  = 0x1000;
    limits.BasicLimitInformation.LimitFlags = JOB_OBJECT_LIMIT_PROCESS_MEMORY;

    NtSetInformationJobObject(job,
                              JobObjectExtendedLimitInformation,
                              &limits,
                              sizeof(limits));
    printf("Try to Attach me !\n");
    getchar();
    return 0;
}