2b61baf4-c396-4e1b-b487-87c1ebf4b17a

grubx64.efi :inline

Description

This was provided by Canonical and revoked Jul-20

  • UUID: 2b61baf4-c396-4e1b-b487-87c1ebf4b17a
  • 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\grubx64.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

  • CVE-2020-10713
  • CVE-2020-14308
  • CVE-2020-14309
  • CVE-2020-14310
  • CVE-2020-14311
  • CVE-2020-15705
  • CVE-2020-15706
  • CVE-2020-15707

    • Known Vulnerable Samples

    PropertyValue
    Filenamegrubx64.efi
    MD5c3f1acb15ea4dd4002d43c5941d1a64e
    SHA131a862d073e46ffc608cfc93ffc8e18c38dfed8f
    SHA2563d23947c39680b9fcf22b092b97c9d38edcc02f7ad13d3a925d1ee0b62797e73
    Authentihash MD5379f249742bb47ea2d7cec2b9d3fb1b7
    Authentihash SHA1b678307ce3a2c6d5a2f988e7ec068590edbf1c50
    Authentihash SHA2567eac80a915c84cd4afec638904d94eb168a8557951a4d539b0713028552b6b8c
    RichPEHeaderHash MD5ffdf660eb1ebf020a1d0a55a90712dfb
    RichPEHeaderHash SHA13e905e3d061d0d59de61fcf39c994fcb0ec1bab3
    RichPEHeaderHash SHA2562b3f99a94b7a7132854be769e27b331419c53989ef42f686d6f5ba09ddefefd6

    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