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Pre-OS Boot: System Firmware

Description from ATT&CK

Adversaries may modify system firmware to persist on systems.The BIOS (Basic Input/Output System) and The Unified Extensible Firmware Interface (UEFI) or Extensible Firmware Interface (EFI) are examples of system firmware that operate as the software interface between the operating system and hardware of a computer.(Citation: Wikipedia BIOS)(Citation: Wikipedia UEFI)(Citation: About UEFI)

System firmware like BIOS and (U)EFI underly the functionality of a computer and may be modified by an adversary to perform or assist in malicious activity. Capabilities exist to overwrite the system firmware, which may give sophisticated adversaries a means to install malicious firmware updates as a means of persistence on a system that may be difficult to detect.

Atomic Tests

Atomic Test #1 - UEFI Persistence via Wpbbin.exe File Creation

Creates Wpbbin.exe in %systemroot%. This technique can be used for UEFI-based pre-OS boot persistence mechanisms.

  • https://grzegorztworek.medium.com/using-uefi-to-inject-executable-files-into-bitlocker-protected-drives-8ff4ca59c94c
  • http://download.microsoft.com/download/8/a/2/8a2fb72d-9b96-4e2d-a559-4a27cf905a80/windows-platform-binary-table.docx
  • https://github.com/tandasat/WPBT-Builder

Supported Platforms: windows

auto_generated_guid: b8a49f03-e3c4-40f2-b7bb-9e8f8fdddbf1

Inputs:

None

Attack Commands: Run with powershell! Elevation Required (e.g. root or admin)

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echo "Creating %systemroot%\wpbbin.exe"      
New-Item -ItemType File -Path "$env:SystemRoot\System32\wpbbin.exe"

Cleanup Commands:

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echo "Removing %systemroot%\wpbbin.exe" 
Remove-Item -Path "$env:SystemRoot\System32\wpbbin.exe"

source