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MediumSplunk security contentTeoderick Contreras +3Threat hunting

Linux Crontab Enumeration

The following analytic detects the use of the crontab command with the list parameter (-l) to enumerate scheduled tasks configured in the invoking user's crontab on Linux systems. Adversaries may use this information…

Description

The following analytic detects the use of the crontab command with the list parameter (-l) to enumerate scheduled tasks configured in the invoking user's crontab on Linux systems. Adversaries may use this information to identify persistence mechanisms, scheduled execution, or potential privilege escalation opportunities. The use of crontab -l is also common administrative activity and may require tuning based on the executing user, parent process, and environment.

Detection logic

Detection requirements

Platform
ESXiLinuxmacOS

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Log source category
cisco_isovalent_process_execsysmon_for_linux_eventid_1

Known benign triggers

  • Administrator or network operator can use this application for automation purposes. Please update the filter macros to remove false positives.

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