Detection: Kubernetes Azure scan fingerprint

DEPRECATED DETECTION

This detection has been marked as deprecated by the Splunk Threat Research team. This means that it will no longer be maintained or supported. If you have any questions or concerns, please reach out to us at research@splunk.com.

Updated Date: 2024-08-15 ID: c5e5bd5c-1013-4841-8b23-e7b3253c840a Author: Rod Soto, Splunk Type: Hunting Product: Splunk Enterprise Security

Description

This search provides information of unauthenticated requests via source IP user agent, request URI and response status data against Kubernetes cluster in Azure

1`kubernetes_azure` category=kube-audit 
2| spath input=properties.log 
3| search responseStatus.code=401 
4| table  sourceIPs{} userAgent verb requestURI responseStatus.reason 
5|`kubernetes_azure_scan_fingerprint_filter`

Data Source

Name Platform Sourcetype Source Supported App
N/A N/A N/A N/A N/A

Macros Used

Name Value
kubernetes_azure sourcetype=mscs:storage:blob:json
kubernetes_azure_scan_fingerprint_filter search *
kubernetes_azure_scan_fingerprint_filter is an empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Annotations

- MITRE ATT&CK
+ Kill Chain Phases
+ NIST
+ CIS
- Threat Actors
ID Technique Tactic
T1526 Cloud Service Discovery Discovery
KillChainPhase.EXPLOITAITON
NistCategory.DE_AE
Cis18Value.CIS_10

Default Configuration

This detection is configured by default in Splunk Enterprise Security to run with the following settings:

Setting Value
Disabled true
Cron Schedule 0 * * * *
Earliest Time -70m@m
Latest Time -10m@m
Schedule Window auto
Creates Risk Event False
This configuration file applies to all detections of type hunting.

Implementation

You must install the Add-on for Microsoft Cloud Services and Configure Kube-Audit data diagnostics

Known False Positives

Not all unauthenticated requests are malicious, but source IPs, userAgent, verb, request URI and response status will provide context.

Associated Analytic Story

Risk Based Analytics (RBA)

Risk Message Risk Score Impact Confidence
tbd 25 50 50
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

Detection Testing

Test Type Status Dataset Source Sourcetype
Validation Not Applicable N/A N/A N/A
Unit ❌ Failing N/A N/A N/A
Integration ❌ Failing N/A N/A N/A

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: GitHub | Version: 2