previously_seen_cloud_compute_instance_types___update.yml

name: Previously Seen Cloud Compute Instance Types - Update
id: 7b7ef9ab-acb9-4e07-af76-4cf1e722885c
version: 1
date: '2020-09-03'
author: David Dorsey, Splunk
type: Baseline
datamodel:
- Change
description: This search builds a table of previously seen cloud compute instance
  types
search: '| tstats earliest(_time) as firstTimeSeen, latest(_time) as lastTimeSeen
  from datamodel=Change where All_Changes.action=created by All_Changes.Instance_Changes.instance_type
  | `drop_dm_object_name("All_Changes.Instance_Changes")` | where instance_type !=
  "unknown" | inputlookup append=t previously_seen_cloud_compute_instance_types |
  stats min(firstTimeSeen) as firstTimeSeen max(lastTimeSeen) as lastTimeSeen by instance_type
  | where lastTimeSeen > relative_time(now(), `previously_seen_cloud_compute_instance_type_forget_window`)
  | eventstats min(firstTimeSeen) as globalFirstTime | eval enough_data = if(globalFirstTime
  <= relative_time(now(), "-14d@d"), 1, 0) | outputlookup previously_seen_cloud_compute_instance_types'
how_to_implement: You must be ingesting the approrpiate cloud infrastructure logs
known_false_positives: none
references: []
tags:
  analytic_story:
  - Cloud Cryptomining
  detections:
  - Cloud Compute Instance Created With Previously Unseen Instance Type
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - All_Changes.action
  - All_Changes.Instance_Changes.instance_type
  security_domain: network