Detection rules › Sigma
Remove Immutable File Attribute
Detects usage of the 'chattr' utility to remove immutable file attribute.
Known false positives
- Administrator interacting with immutable files (e.g. for instance backups).
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Defense Impairment |
Telemetry coverage
| Platform | Record / event type |
|---|---|
| Linux | Event ID 1: Process Create |
Rule body
title: Remove Immutable File Attribute
id: 34979410-e4b5-4e5d-8cfb-389fdff05c12
related:
- id: a5b977d6-8a81-4475-91b9-49dbfcd941f7
type: derived
status: test
description: Detects usage of the 'chattr' utility to remove immutable file attribute.
references:
- https://www.trendmicro.com/en_us/research/22/i/how-malicious-actors-abuse-native-linux-tools-in-their-attacks.html
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-09-15
tags:
- attack.defense-impairment
- attack.t1222.002
logsource:
product: linux
category: process_creation
detection:
selection:
Image|endswith: '/chattr'
CommandLine|contains: ' -i '
condition: selection
falsepositives:
- Administrator interacting with immutable files (e.g. for instance backups).
level: medium
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
Image|endswith: '/chattr'
CommandLine|contains: ' -i '
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
CommandLine | match |
| field:"CommandLine" kind:match value:" -i " |
Image | ends_with |
| field:"Image" kind:ends_with value:"/chattr" |