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Description

This search looks for cloud compute instances created by users who have not created them before.

  • Type: Anomaly
  • Product: Splunk Security Analytics for AWS, Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Change
  • Last Updated: 2021-07-13
  • Author: Rico Valdez, Splunk
  • ID: 37a0ec8d-827e-4d6d-8025-cedf31f3a149

ATT&CK

ID Technique Tactic
T1078.004 Cloud Accounts Defense Evasion, Persistence, Privilege Escalation, Initial Access
T1078 Valid Accounts Defense Evasion, Persistence, Privilege Escalation, Initial Access

| tstats `security_content_summariesonly` count earliest(_time) as firstTime, latest(_time) as lastTime values(All_Changes.object) as dest from datamodel=Change where All_Changes.action=created by All_Changes.user All_Changes.vendor_region 
| `drop_dm_object_name("All_Changes")` 
| lookup previously_seen_cloud_compute_creations_by_user user as user OUTPUTNEW firstTimeSeen, enough_data 
| eventstats max(enough_data) as enough_data 
| where enough_data=1 
| eval firstTimeSeenUser=min(firstTimeSeen) 
| where isnull(firstTimeSeenUser) OR firstTimeSeenUser > relative_time(now(), "-24h@h") 
| table firstTime, user, dest, count vendor_region 
| `security_content_ctime(firstTime)` 
| `cloud_compute_instance_created_by_previously_unseen_user_filter`

Associated Analytic Story

How To Implement

You must be ingesting the appropriate cloud-infrastructure logs Run the "Previously Seen Cloud Compute Creations By User" support search to create of baseline of previously seen users.

Required field

  • _time
  • All_Changes.object
  • All_Changes.action
  • All_Changes.user
  • All_Changes.vendor_region

Kill Chain Phase

Known False Positives

It's possible that a user will start to create compute instances for the first time, for any number of reasons. Verify with the user launching instances that this is the intended behavior.

RBA

Risk Score Impact Confidence Message
18.0 30 60 User $user$ is creating a new instance $dest$ for the first time

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

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