UEFI Persistence Via Wpbbin - FileCreation — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: high. Source dates: 2022-07-18 / not supplied.

{
  "product": "windows",
  "category": "file_event"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: cb10b8674f897f77824e060faf052a39c1a14261fc121c9a74c86aa2f69495c9

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: UEFI Persistence Via Wpbbin - FileCreation
id: e94b9ddc-eec5-4bb8-8a58-b9dc5f4e185f
status: test
description: Detects creation of a file named "wpbbin" in the "%systemroot%\system32\" directory. Which could be indicative of UEFI based persistence method
references:
    - https://grzegorztworek.medium.com/using-uefi-to-inject-executable-files-into-bitlocker-protected-drives-8ff4ca59c94c
    - https://persistence-info.github.io/Data/wpbbin.html
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-07-18
tags:
    - attack.persistence
    - attack.stealth
    - attack.t1542.001
logsource:
    product: windows
    category: file_event
detection:
    selection:
        TargetFilename: 'C:\Windows\System32\wpbbin.exe'
    condition: selection
falsepositives:
    - Legitimate usage of the file by hardware manufacturer such as lenovo (Thanks @0gtweet for the tip)
level: high

Original YAML and metadata in JSON

False positives

• Legitimate usage of the file by hardware manufacturer such as lenovo (Thanks @0gtweet for the tip)

Source references

• https://grzegorztworek.medium.com/using-uefi-to-inject-executable-files-into-bitlocker-protected-drives-8ff4ca59c94c
• https://persistence-info.github.io/Data/wpbbin.html