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Description

This search provides information of unauthenticated requests via user agent, and authentication data against Kubernetes cluster in AWS

  • Type: Hunting
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel:
  • Last Updated: 2020-04-15
  • Author: Rod Soto, Splunk
  • ID: 294c4686-63dd-4fe6-93a2-ca807626704a

ATT&CK

ID Technique Tactic
T1526 Cloud Service Discovery Discovery
`aws_cloudwatchlogs_eks` "user.username"="system:anonymous" userAgent!="AWS Security Scanner" 
| rename sourceIPs{} as src_ip 
| stats count min(_time) as firstTime max(_time) as lastTime values(responseStatus.reason) values(source) as cluster_name values(responseStatus.code) values(userAgent) as http_user_agent values(verb) values(requestURI) by src_ip user.username user.groups{} 
| `security_content_ctime(lastTime)` 
| `security_content_ctime(firstTime)` 
|`amazon_eks_kubernetes_cluster_scan_detection_filter` 

Associated Analytic Story

How To Implement

You must install the AWS App for Splunk (version 5.1.0 or later) and Splunk Add-on for AWS (version 4.4.0 or later), then configure your CloudWatch EKS Logs inputs.

Required field

  • _time
  • user.username
  • userAgent
  • sourceIPs{}
  • responseStatus.reason
  • source
  • responseStatus.code
  • verb
  • requestURI
  • src_ip
  • user.groups{}

Kill Chain Phase

  • Reconnaissance

Known False Positives

Not all unauthenticated requests are malicious, but frequency, UA and source IPs will provide context.

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

source | version: 1