WARNING THIS IS A EXPERIMENTAL object

We have not been able to test, simulate, or build datasets for this object. Use at your own risk. This analytic is NOT supported.

Try in Splunk Security Cloud

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

  • Last Updated: 2020-04-15
  • Author: Rod Soto, Splunk
  • ID: 294c4686-63dd-4fe6-93a2-ca807626704a

Annotations

ATT&CK
ID Technique Tactic
T1526 Cloud Service Discovery Discovery
Kill Chain Phase
  • Reconnaissance
NIST
CIS20
CVE
1
2
3
4
5
6
`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` 

Macros

The SPL above uses the following Macros:

Note that amazon_eks_kubernetes_cluster_scan_detection_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required field

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

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.

Known False Positives

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

Associated Analytic story

RBA

Risk Score Impact Confidence Message
25.0 50 50 tbd

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