Add SafeBoot Keys Via Reg Utility — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: high. Source dates: 2022-09-02 / 2024-03-19.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 6f8140837e97f23d602424ce55aaabbbafbf5cfe5964f3580b258f128af5ad0c

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: Add SafeBoot Keys Via Reg Utility
id: d7662ff6-9e97-4596-a61d-9839e32dee8d
related:
    - id: fc0e89b5-adb0-43c1-b749-c12a10ec37de
      type: similar
status: test
description: Detects execution of "reg.exe" commands with the "add" or "copy" flags on safe boot registry keys. Often used by attacker to allow the ransomware to work in safe mode as some security products do not
references:
    - https://redacted.com/blog/bianlian-ransomware-gang-gives-it-a-go/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-09-02
modified: 2024-03-19
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\reg.exe'
        - OriginalFileName: 'reg.exe'
    selection_safeboot:
        CommandLine|contains: '\SYSTEM\CurrentControlSet\Control\SafeBoot'
    selection_flag:
        CommandLine|contains:
            - ' copy '
            - ' add '
    condition: all of selection*
falsepositives:
    - Unlikely
level: high
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_reg_add_safeboot/info.yml

Original YAML and metadata in JSON

False positives

• Unlikely

Source references

• https://redacted.com/blog/bianlian-ransomware-gang-gives-it-a-go/