⚠️ WARNING THIS IS A EXPERIMENTAL DETECTION

We have not been able to test, simulate or build datasets for it, use at your own risk!

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Description

This search provides information of unauthenticated requests via user agent, and authentication data against Kubernetes cluster's pods

  • Type: Hunting
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel:
  • Last Updated: 2020-07-17
  • Author: Rod Soto, Splunk
  • ID: 19b53215-4a16-405b-8087-9e6acf619842

ATT&CK

ID Technique Tactic
T1526 Cloud Service Discovery Discovery
`google_gcp_pubsub_message` category=kube-audit 
|spath input=properties.log 
|search responseStatus.code=401 
|table sourceIPs{} userAgent verb requestURI responseStatus.reason properties.pod 
| `gcp_kubernetes_cluster_pod_scan_detection_filter`

Associated Analytic Story

How To Implement

You must install the GCP App for Splunk (version 2.0.0 or later), then configure stackdriver and set a Pub/Sub subscription to be imported to Splunk.

Required field

  • _time
  • category
  • responseStatus.code
  • sourceIPs{}
  • userAgent
  • verb
  • requestURI
  • responseStatus.reason
  • properties.pod

Kill Chain Phase

  • Reconnaissance

Known False Positives

Not all unauthenticated requests are malicious, but frequency, User Agent, source IPs and pods 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