Detection rules › Sigma
Indicator Removal on Host - Clear Mac System Logs
Detects deletion of local audit logs
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Defense Impairment | T1685.006 Disable or Modify Tools: Clear Linux or Mac System Logs |
Event coverage
| Provider | Event | Title |
|---|---|---|
| ESF | exec | Process Execution (Notify) |
Rule body yaml
title: Indicator Removal on Host - Clear Mac System Logs
id: acf61bd8-d814-4272-81f0-a7a269aa69aa
status: test
description: Detects deletion of local audit logs
references:
- https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1070.002/T1070.002.md
author: remotephone, oscd.community
date: 2020-10-11
modified: 2022-09-16
tags:
- attack.defense-impairment
- attack.t1685.006
logsource:
product: macos
category: process_creation
detection:
selection1:
Image|endswith:
- '/rm'
- '/unlink'
- '/shred'
selection_cli_1:
CommandLine|contains: '/var/log'
selection_cli_2:
CommandLine|contains|all:
- '/Users/'
- '/Library/Logs/'
condition: selection1 and 1 of selection_cli*
falsepositives:
- Legitimate administration activities
level: medium
Stages and Predicates
Stage 0: condition
selection1 and 1 of selection_cli*Stage 1: selection1
selection1:
Image|endswith:
- '/rm'
- '/unlink'
- '/shred'
Stage 2: selection_cli_1
selection_cli_1:
CommandLine|contains: '/var/log'
Stage 3: selection_cli_2
selection_cli_2:
CommandLine|contains|all:
- '/Users/'
- '/Library/Logs/'
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
CommandLine | match |
|
Image | ends_with |
|