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Description

This search uses the Kubernetes logs from a nginx ingress controller to detect local file inclusion attacks.

  • Type: TTP

  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2021-08-20
  • Author: Patrick Bareiss, Splunk
  • ID: 0f83244b-425b-4528-83db-7a88c5f66e48

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1212 Exploitation for Credential Access Credential Access
Kill Chain Phase
  • Exploitation
NIST
  • DE.CM
CIS20
  • CIS 13
CVE 


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`kubernetes_container_controller` 
| rex field=_raw "^(?<remote_addr>\S+)\s+-\s+-\s+\[(?<time_local>[^\]]*)\]\s\"(?<request>[^\"]*)\"\s(?<status>\S*)\s(?<body_bytes_sent>\S*)\s\"(?<http_referer>[^\"]*)\"\s\"(?<http_user_agent>[^\"]*)\"\s(?<request_length>\S*)\s(?<request_time>\S*)\s\[(?<proxy_upstream_name>[^\]]*)\]\s\[(?<proxy_alternative_upstream_name>[^\]]*)\]\s(?<upstream_addr>\S*)\s(?<upstream_response_length>\S*)\s(?<upstream_response_time>\S*)\s(?<upstream_status>\S*)\s(?<req_id>\S*)" 
| lookup local_file_inclusion_paths local_file_inclusion_paths AS request OUTPUT lfi_path 
| search lfi_path=yes 
| rename remote_addr AS src_ip, upstream_status as status, proxy_upstream_name as proxy 
| rex field=request "^(?<http_method>\S+)\s(?<url>\S+)\s" 
| eval phase="operate" 
| eval severity="high" 
| stats count min(_time) as firstTime max(_time) as lastTime by src_ip, status, url, http_method, host, http_user_agent, proxy, phase, severity 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `kubernetes_nginx_ingress_lfi_filter`

Macros

The SPL above uses the following Macros:

:information_source: kubernetes_nginx_ingress_lfi_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Lookups

The SPL above uses the following Lookups:

Required fields

List of fields required to use this analytic.

  • raw

How To Implement

You must ingest Kubernetes logs through Splunk Connect for Kubernetes.

Known False Positives

unknown

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
49.0 70 70 Local File Inclusion Attack detected on $host$

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

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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