NGINX - Request to sensitive files

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Id	2141ef6c-d158-4d44-b739-b145a4c21947
Rulename	NGINX - Request to sensitive files
Description	Detects request to sensitive files.
Severity	Medium
Tactics	InitialAccess
Techniques	T1189
Required data connectors	CustomLogsAma
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/NGINX HTTP Server/Analytic Rules/NGINXRequestToSensitiveFiles.yaml
Version	1.0.2
Arm template	2141ef6c-d158-4d44-b739-b145a4c21947.json

KQL

let forbidden_files = dynamic(['shadow', 'passwd', 'id_rsa']);
NGINXHTTPServer
| extend File = extract(@"(.*\/)?(.*)", 2, tostring(UrlOriginal))
| where File in (forbidden_files)
| extend FileCustomEntity = File, UrlCustomEntity = UrlOriginal

YAML

OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/NGINX HTTP Server/Analytic Rules/NGINXRequestToSensitiveFiles.yaml
queryFrequency: 1h
name: NGINX - Request to sensitive files
severity: Medium
triggerThreshold: 0
query: |
  let forbidden_files = dynamic(['shadow', 'passwd', 'id_rsa']);
  NGINXHTTPServer
  | extend File = extract(@"(.*\/)?(.*)", 2, tostring(UrlOriginal))
  | where File in (forbidden_files)
  | extend FileCustomEntity = File, UrlCustomEntity = UrlOriginal  
requiredDataConnectors:
- dataTypes:
  - NGINX_CL
  connectorId: CustomLogsAma
relevantTechniques:
- T1189
status: Available
triggerOperator: gt
queryPeriod: 1h
description: |
    'Detects request to sensitive files.'
id: 2141ef6c-d158-4d44-b739-b145a4c21947
version: 1.0.2
entityMappings:
- fieldMappings:
  - columnName: FileCustomEntity
    identifier: Name
  entityType: File
- fieldMappings:
  - columnName: UrlCustomEntity
    identifier: Url
  entityType: URL
kind: Scheduled
tactics:
- InitialAccess

ARM