b3f78afd-8a4f-444e-8561-b32a5d6015f1

bootx64.efi :inline

Description

This was provided by Microsoft and revoked May-23

  • UUID: b3f78afd-8a4f-444e-8561-b32a5d6015f1
  • Created: 2023-05-22
  • Author: Michael Haag
  • Acknowledgement: |

Download

This download link contains the Revoked Bootloader!

Commands

bcdedit /copy "{current}" /d "TheBoots" | {% if ($_ -match '{\S+}') { bcdedit /set $matches[0] path \windows\temp\bootx64.efi } }
Use CasePrivilegesOperating System
Persistence64-bit

Detections

YARA 🏹

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Exact Match

with header and size limitation

Threat Hunting

without header and size limitation

Renamed

for renamed bootloader files

Sigma 🛡️

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Names

detects loading using name only

Hashes

detects loading using hashes only

Sysmon 🔎

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Block

on hashes

Alert

on hashes

Resources


  • https://uefi.org/revocationlistfile
  • https://support.microsoft.com/en-gb/topic/microsoft-guidance-for-applying-secure-boot-dbx-update-kb4575994-e3b9e4cb-a330-b3ba-a602-15083965d9ca

    • CVE

  • Black Lotus Microsoft Windows 10 version 1507

    • Known Vulnerable Samples

    PropertyValue
    Filenamebootx64.efi
    MD5
    SHA1
    SHA256C8AA71C72318CA43CBA4302FBAD12B474E7E4ED1B0EDA8A48CD71343A32FF155
    Authentihash MD5
    Authentihash SHA1
    Authentihash SHA256CB95A4D2E0E02A5B56D059C9F223C2326753EA8C44D2E3FA6C4486629BE387A9

    Imports

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    Imports

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    ImportedFunctions

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    ExportedFunctions

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    Signature

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    source

    last_updated: 2023-08-31