Remove Immutable File Attribute - Auditd

 1title: Remove Immutable File Attribute - Auditd
 2id: a5b977d6-8a81-4475-91b9-49dbfcd941f7
 3status: test
 4description: Detects removing immutable file attribute.
 5references:
 6    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1222.002/T1222.002.md
 7author: Jakob Weinzettl, oscd.community
 8date: 2019-09-23
 9modified: 2022-11-26
10tags:
11    - attack.defense-evasion
12    - attack.t1222.002
13logsource:
14    product: linux
15    service: auditd
16detection:
17    selection:
18        type: 'EXECVE'
19        a0|contains: 'chattr'
20        a1|contains: '-i'
21    condition: selection
22falsepositives:
23    - Administrator interacting with immutable files (e.g. for instance backups).
24level: medium
25simulation:
26    - type: atomic-red-team
27      name: Remove immutable file attribute
28      technique: T1222.002
29      atomic_guid: e7469fe2-ad41-4382-8965-99b94dd3c13f