28fb8eaa-e498-44f7-8f1f-1dcf1dad47d7

bootarm.efi :inline

Description

This was provided by Microsoft and revoked May-23

  • UUID: 28fb8eaa-e498-44f7-8f1f-1dcf1dad47d7
  • 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\bootarm.efi } }
Use CasePrivilegesOperating System
Persistence32-bit ARM

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 8

    • Known Vulnerable Samples

    PropertyValue
    Filenamebootarm.efi
    MD5
    SHA1
    SHA2560E0D94096278CEDCF333D4902F64ADE7815ED4000A1F6EA45EB93D2DBE18E496
    Authentihash MD5
    Authentihash SHA1
    Authentihash SHA25622B5A88D79B8146598613B3701B0D2AD3E1D2BC215D3A613A30356953239485C

    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