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Suspicious CronTab Creation or Modification

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Suspicious CronTab Creation or Modification

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Identifies attempts to create or modify a crontab via a process that is not crontab (i.e python, osascript, etc.). This activity should not be highly prevalent and could indicate the use of cron as a persistence mechanism by a threat actor.

Rule type: eql

Rule indices:

  • logs-endpoint.events.*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Domain: Endpoint
  • OS: macOS
  • Use Case: Threat Detection
  • Tactic: Persistence

Version: 103

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

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file where host.os.type == "macos" and event.type != "deletion" and process.name != null and
  file.path : "/private/var/at/tabs/*" and not process.executable == "/usr/bin/crontab"

Framework: MITRE ATT&CKTM

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