Detection rules › Sigma
Potential Ransomware or Unauthorized MBR Tampering Via Bcdedit.EXE
Detects potential malicious and unauthorized usage of bcdedit.exe
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | |
| Stealth |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 1: Process creation |
Rule body
title: Potential Ransomware or Unauthorized MBR Tampering Via Bcdedit.EXE
id: c9fbe8e9-119d-40a6-9b59-dd58a5d84429
status: test
description: Detects potential malicious and unauthorized usage of bcdedit.exe
references:
- https://learn.microsoft.com/en-us/windows-hardware/drivers/devtest/bcdedit--set
- https://twitter.com/malwrhunterteam/status/1372536434125512712/photo/2
author: '@neu5ron'
date: 2019-02-07
modified: 2023-02-15
tags:
- attack.stealth
- attack.t1070
- attack.persistence
- attack.t1542.003
logsource:
category: process_creation
product: windows
detection:
selection_img:
- Image|endswith: '\bcdedit.exe'
- OriginalFileName: 'bcdedit.exe'
selection_cli:
CommandLine|contains:
- 'delete'
- 'deletevalue'
- 'import'
- 'safeboot'
- 'network'
condition: all of selection_*
level: medium
Stages and Predicates
Stage 0: condition
all of selection_*Stage 1: selection_img
selection_img:
- Image|endswith: '\bcdedit.exe'
- OriginalFileName: 'bcdedit.exe'
Stage 2: selection_cli
selection_cli:
CommandLine|contains:
- 'delete'
- 'deletevalue'
- 'import'
- 'safeboot'
- 'network'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
CommandLine | match |
| field:"CommandLine" kind:match |
Image | ends_with |
| field:"Image" kind:ends_with value:"\bcdedit.exe" |
OriginalFileName | eq |
| field:"OriginalFileName" kind:eq value:"bcdedit.exe" |