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Add system-wide cron job analytic rule #133

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Add system-wide cron job analytic rule #133

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30 changes: 30 additions & 0 deletions custom_analytic_detections/systemwide_cronjob
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# systemwide_cronjob
#
# This Analytic predicate can be used to report on the creation or modification of the system-wide crontab file located at /etc/crontab.
# The detection functions by monitoring for new entries added to the crontab file, excluding comments, indicating that a new system-wide scheduled task has been created or an existing one has been modified.

# Required Analytic Configuration:
Sensor Event Type: File System Event
Level: 0
Snapshot File Path: /etc/crontab

# Analytic Predicate:

($event.path == "/etc/crontab") AND
(($event.isNewFile == 1 OR $event.isModified == 1) AND
FUNCTION($event.file, "newDelimitedEntries:comments:", ".newlines", "#").@count > 0)

# Context items
Type: String
Name: ItemName
Expression: "cron job"

Type: Binary
Name: ItemBinary
Expression: FUNCTION(event.file, 'newDelimitedEntries:comments:', '.newlines', '#')[0]


# Recommended Analytic Configuration:
Severity: Informational
Categories: Visibility
Tags: MITREattack,Execution,ScheduledTaskJob,T1053.003,Persistence