Created the Monday 18 March 2019. Updated 3 years, 6 months ago.

An EventPair Object is an event constructed by two _KEVENT structures which are conventionally named High and Low.

There is a relation between generic Event Objects and Debuggers because they must create a custom event called DebugEvent able to handle exceptions. Due to the presence of events owned by the Debugger, every information relative to the events of a normal process differs from a debugged process.

Technique Identifier


Technique Tag


Code Snippets

#include <stdio.h>
#include <iostream>
#include <stdlib.h>
#include <windows.h>
#include "defs.h"

#pragma comment(lib,"ntdll.lib")
#pragma comment(lib,"psapi.lib")

void QueryProcessHeapMethod(void)
    PDEBUG_BUFFER buffer;
    buffer = RtlCreateQueryDebugBuffer(0,FALSE);

    if (buffer->RemoteSectionBase == (PVOID) 0x50000062){
    else {
        MessageBoxA(NULL,"Not Debugged","Warning",MB_OK);
    if (buffer->EventPairHandle == (PVOID) 0x00002b98) {
    else {
        MessageBoxA(NULL,"Not Debugged","Warning",MB_OK);
        printf("EventPairHandle= %x",(int)buffer->EventPairHandle);
int main()
    return (EXIT_SUCCESS);

Detection Rules

rule Detect_EventPairHandles: AntiDebug {
        description = "Detect EventPairHandlesas anti-debug"
        author = "Unprotect"
        comment = "Experimental rule"
        $1 = "EventPairHandles" fullword ascii
        $2 = "RtlCreateQueryDebugBuffer" fullword ascii
        $3 = "RtlQueryProcessHeapInformation" fullword ascii
       uint16(0) == 0x5A4D and filesize < 1000KB and 2 of them 

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