baseline_of_cloud_instances_launched.yml

name: Baseline Of Cloud Instances Launched
id: b01bd274-f661-4f9c-bd9f-cf23ff6ae0bc
version: 1
date: '2020-08-14'
author: David Dorsey, Splunk
type: Baseline
datamodel:
- Change
description: This search is used to build a Machine Learning Toolkit (MLTK) model
  for how many instances are created in the environment. By default, the search uses
  the last 90 days of data to build the model and the model is rebuilt weekly. The
  model created by this search is then used in the corresponding detection search,
  which identifies subsequent outliers in the number of instances created in a small
  time window.
search: '| tstats count as instances_launched from datamodel=Change where (All_Changes.action=created)
  AND All_Changes.status=success AND All_Changes.object_category=instance by _time
  span=1h | makecontinuous span=1h _time | eval instances_launched=coalesce(instances_launched,
  (random()%2)*0.0000000001) | eval HourOfDay=strftime(_time, "%H") | eval HourOfDay=floor(HourOfDay/4)*4
  | eval DayOfWeek=strftime(_time, "%w") | eval isWeekend=if(DayOfWeek >= 1 AND DayOfWeek
  <= 5, 0, 1) | table _time instances_launched, HourOfDay, isWeekend | fit DensityFunction
  instances_launched by "HourOfDay,isWeekend" into cloud_excessive_instances_created_v1
  dist=expon show_density=true'
how_to_implement: 'You must have Enterprise Security 6.0 or later, if not you will
  need to verify that the Machine Learning Toolkit (MLTK) version 4.2 or later is
  installed, along with any required dependencies. Depending on the number of users
  in your environment, you may also need to adjust the value for max_inputs in the
  MLTK settings for the DensityFunction algorithm, then ensure that the search completes
  in a reasonable timeframe. By default, the search builds the model using the past
  90 days of data. You can modify the search window to build the model over a longer
  period of time, which may give you better results. You may also want to periodically
  re-run this search to rebuild the model with the latest data.

  More information on the algorithm used in the search can be found at `https://docs.splunk.com/Documentation/MLApp/4.2.0/User/Algorithms#DensityFunction`.'
known_false_positives: none
references: []
tags:
  analytic_story:
  - Cloud Cryptomining
  - Suspicious Cloud Instance Activities
  detections:
  - Abnormally High Number Of Cloud Instances Launched
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - All_Changes.action
  - All_Changes.status
  - All_Changes.object_category
  security_domain: network
deployment:
  scheduling:
    cron_schedule: 0 2 * * 0
    earliest_time: -90d@d
    latest_time: -1d@d
    schedule_window: auto