Modifying Crontab

calendar Oct 23, 2025 · attack.privilege-escalation attack.execution attack.persistence attack.t1053.003  ·
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Detects suspicious modification of crontab file.

Sigma rule (View on GitHub)

 1title: Modifying Crontab
 2id: af202fd3-7bff-4212-a25a-fb34606cfcbe
 3status: test
 4description: Detects suspicious modification of crontab file.
 5references:
 6    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1053.003/T1053.003.md
 7author: Pawel Mazur
 8date: 2022-04-16
 9tags:
10    - attack.privilege-escalation
11    - attack.execution
12    - attack.persistence
13    - attack.t1053.003
14logsource:
15    product: linux
16    service: cron
17detection:
18    keywords:
19        - 'REPLACE'
20    condition: keywords
21falsepositives:
22    - Legitimate modification of crontab
23level: medium

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