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Detection rules › Sigma

Modifying Crontab

Status
test
Severity
medium
Log source
product linux, service cron
Author
Pawel Mazur
Source
github.com/SigmaHQ/sigma

Detects suspicious modification of crontab file.

MITRE ATT&CK coverage

TacticTechniques
ExecutionT1053.003 Scheduled Task/Job: Cron
PersistenceT1053.003 Scheduled Task/Job: Cron
Privilege EscalationT1053.003 Scheduled Task/Job: Cron

Rule body yaml

title: Modifying Crontab
id: af202fd3-7bff-4212-a25a-fb34606cfcbe
status: test
description: Detects suspicious modification of crontab file.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1053.003/T1053.003.md
author: Pawel Mazur
date: 2022-04-16
tags:
    - attack.privilege-escalation
    - attack.execution
    - attack.persistence
    - attack.t1053.003
logsource:
    product: linux
    service: cron
detection:
    keywords:
        - 'REPLACE'
    condition: keywords
falsepositives:
    - Legitimate modification of crontab
level: medium

Stages and Predicates

Stage 0: condition

keywords

Stage 1: keywords

keywords:
    - 'REPLACE'