530ab1a9-d9a6-4f01-986a-5b69c99400b4

shim.efi :inline

Description

This was provided by CPSD and revoked Aug-22

  • UUID: 530ab1a9-d9a6-4f01-986a-5b69c99400b4
  • 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\shim.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-2022-34303

    • Known Vulnerable Samples

    PropertyValue
    Filenameshim.efi
    MD5
    SHA1
    SHA25651BD59697B4E1DF61DF32AD57CEBE394BE54E3E9DBFEB8DC00A3A176D13A5767
    Authentihash MD5
    Authentihash SHA1
    Authentihash SHA256284153E7D04A9F187E5C3DBFE17B2672AD2FBDD119F27BEC789417B7919853EC

    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