Jackson T. jthuraisamy

GhostLoader Steps :)

1. Create C:\Tools
2. Copy Some .NET, any .NET binary to C:\Tools
3. In this example, we use FileHistory.exe, but any .NET app will do.
4. Ensure FileHistory.exe.config is in the same path
5. Execute C:\Tools\FileHistory.exe

GospelRoom: Data Storage in UEFI NVRAM Variables

Behaviour

Persist data in UEFI NVRAM variables.

Benefits

Stealthy way to store secrets and other data in UEFI.
Will survive a reimaging of the operating system.

Windows Toolkit

Binary

Native Binaries

IDA Pro

IDA Plugins	Preferred	Neutral	Unreviewed

PyExZ3 Example with HackSysExtremeVulnerableDriver

TL;DR: Using symbolic execution to recover driver IOCTL codes that are computed at runtime.

The goal here is to find valid IOCTL codes for the HackSysExtremeVulnerableDriver by analyzing the binary. The control flow varies between the binary and source due to compiler optimizations. This results in a situation where only a few IOCTL codes in the assembly are represented as a constant with the remaining being computed at runtime.

The code in hevd_ioctl.py is a approximation of the control flow of the compiled IrpDeviceIoCtlHandler function. The effects of the compiler optimization are more pronounced when comparing this code to the original C function. To comply with requirements of the PyExZ3 module, the target function is named after the script's filename, and the `ex

	#Recover function names from logger function calls.

	#@author @Jackson_T
	#@category _NEW_
	#@keybinding
	#@menupath
	#@toolbar

	import re
	from ghidra.program.model.symbol import SourceType

	#include <Windows.h>
	#include <ImageHlp.h>
	#include <strsafe.h>
	#include "loaded_psp_drivers.h"

	#include <set>
	#include <string>
	#include <algorithm>

	#pragma comment(lib, "crypt32.lib")

	import os.path
	import pefile

	print('#pragma once')

	target_dll = r'target.dll'
	pe = pefile.PE(target_dll)
	for export in pe.DIRECTORY_ENTRY_EXPORT.symbols:
	if export.name:
	name = export.name.decode()

	.code

	NtAcceptConnectPort PROC
	mov rax, gs:[60h] ; Load PEB into RAX.
	NtAcceptConnectPort_Check_X_X_XXXX: ; Check major version.
	cmp dword ptr [rax+118h], 5
	je NtAcceptConnectPort_SystemCall_5_X_XXXX
	cmp dword ptr [rax+118h], 6
	je NtAcceptConnectPort_Check_6_X_XXXX
	cmp dword ptr [rax+118h], 10

	.code

	NtCreateFile PROC
	mov rax, gs:[60h]
	NtCreateFile_Check_X_X_XXXX: ; Check major version.
	cmp dword ptr [rax+118h], 5
	je NtCreateFile_SystemCall_5_X_XXXX
	cmp dword ptr [rax+118h], 6
	je NtCreateFile_Check_6_X_XXXX
	cmp dword ptr [rax+118h], 10

	"""
	IDAPython Script to highlight function calls.
	Re-implemented by jthuraisamy (not the original author).

	Install to %IDADIR%\plugins\highlight_calls.py.

	Run by pressing Ctrl+Alt+H or go to Options -> Highlight Call Instructions.
	"""

	class HighlightHandler(idaapi.action_handler_t):