detection.wiki

Detection rules › Sigma

File Time Attribute Change

Status
test
Severity
medium
Log source
category process_creation, product macos
Author
Igor Fits, Mikhail Larin, oscd.community
Source
github.com/SigmaHQ/sigma

Detect file time attribute change to hide new or changes to existing files

MITRE ATT&CK coverage

TacticTechniques
Stealth

Telemetry coverage

PlatformRecord / event type
macOSESF event exec (NOTIFY): Fires after execve(2) or posix_spawn(2) succeeds, delivering a post-fact record of the new process.

Rule body

title: File Time Attribute Change
id: 88c0f9d8-30a8-4120-bb6b-ebb54abcf2a0
status: test
description: Detect file time attribute change to hide new or changes to existing files
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1070.006/T1070.006.md
author: Igor Fits, Mikhail Larin, oscd.community
date: 2020-10-19
modified: 2022-01-12
tags:
    - attack.stealth
    - attack.t1070.006
logsource:
    product: macos
    category: process_creation
detection:
    selection:
        Image|endswith: '/touch'
        CommandLine|contains:
            - '-t'
            - '-acmr'
            - '-d'
            - '-r'
    condition: selection
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    Image|endswith: '/touch'
    CommandLine|contains:
        - '-t'
        - '-acmr'
        - '-d'
        - '-r'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
CommandLinematch
  • -acmr
  • -d
  • -r
  • -t
field:"CommandLine" kind:match
Imageends_with
  • /touch
field:"Image" kind:ends_with value:"/touch"