Adrian Denkiewicz adenkiewicz

IERAE CTF 2024 - Intel CET Bypass Challenge

IERAE CTF had one of the coolest pwn challenges I've done in the while. It was written by hugeh0ge.

Here's the full source:

// gcc chal.c -fno-stack-protector -static -o chal
#include <stdio.h>
#include

Introduction

As the Ghidra open source community is growing, trying to document the new projects around Ghidra. Feel free to fork the gist and propose improvements.

CPU support

New 6502 language module for Ghidra
Atmel AVR helpers for Ghidra - ATmega328p
Processor definitions for DMG and CGB in Ghidra - Gameboy CPU (LR35902) (WiP)
ghidra based disassembly of the x68000's IPL.

	#include <Windows.h>

	LONG SingleStepEncryptDecrypt(EXCEPTION_POINTERS* ExceptionInfo);
	typedef VOID(__stdcall* Shellcode)();

	LPBYTE ShellcodeBuffer;
	ULONG_PTR PreviousOffset;
	ULONG_PTR CurrentOffset;
	ULONGLONG InstructionCount;
	DWORD dwOld;

	Param(
	[Parameter(Mandatory, Position = 0)]
	[string]$HostDrive,
	[Parameter(Mandatory, Position = 1)]
	[string]$LocalDrive
	)

	# Script to map a host drive inside a Windows Docker Server Container
	# You need to be an admin in the container for this to work.
	# Use as .\map_host_drive C: X:

	filter Expand-DefenderAVSignatureDB {
	<#
	.SYNOPSIS

	Decompresses a Windows Defender AV signature database (.VDM file).

	.DESCRIPTION

	Expand-DefenderAVSignatureDB extracts a Windows Defender AV signature database (.VDM file). This function was developed by reversing mpengine.dll and with the help of Tavis Ormandy and his LoadLibrary project (https://github.com/taviso/loadlibrary). Note: Currently, "scrambled" databases are not supported although, I have yet to encounter a scrambled database. Thus far, all databases I've encountered are zlib-compressed.

	#!/bin/bash
	# Original : https://raw.githubusercontent.com/Microsoft/linux-vm-tools/master/arch/install-config.sh

	###############################################################################
	# Update our machine to the latest code if we need to.
	#

	if [ "$(id -u)" -ne 0 ]; then
	echo 'This script must be run with root privileges' >&2
	exit 1

	MATCH (u:User)-[r:AdminTo\|MemberOf*1..]->(c:Computer
	RETURN u.name

	That’ll return a list of users who have admin rights on at least one system either explicitly or through group membership
	---------------

	MATCH
	(U:User)-[r:MemberOf\|:AdminTo*1..]->(C:Computer)
	WITH
	U.name as n,

	::
	::#######################################################################
	::
	:: Change file associations to protect against common ransomware attacks
	:: Note that if you legitimately use these extensions, like .bat, you will now need to execute them manually from cmd or powershell
	:: Alternatively, you can right-click on them and hit 'Run as Administrator' but ensure it's a script you want to run :)
	:: ---------------------
	ftype htafile="%SystemRoot%\system32\NOTEPAD.EXE" "%1"
	ftype WSHFile="%SystemRoot%\system32\NOTEPAD.EXE" "%1"
	ftype batfile="%SystemRoot%\system32\NOTEPAD.EXE" "%1"

	# PowerView's last major overhaul is detailed here: http://www.harmj0y.net/blog/powershell/make-powerview-great-again/
	# tricks for the 'old' PowerView are at https://gist.github.com/HarmJ0y/3328d954607d71362e3c

	# the most up-to-date version of PowerView will always be in the dev branch of PowerSploit:
	# https://github.com/PowerShellMafia/PowerSploit/blob/dev/Recon/PowerView.ps1

	# New function naming schema:
	# Verbs:
	# Get : retrieve full raw data sets
	# Find : ‘find’ specific data entries in a data set