Imperva - Forbidden HTTP request method in request

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Id	7ebc9e24-319c-4786-9151-c898240463bc
Rulename	Imperva - Forbidden HTTP request method in request
Description	Detects connections with unexpected HTTP request method.
Severity	Medium
Tactics	InitialAccess
Techniques	T1190 T1133
Required data connectors	ImpervaWAFCloudAPI
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/ImpervaCloudWAF/Analytic Rules/ImpervaForbiddenMethod.yaml
Version	1.0.0
Arm template	7ebc9e24-319c-4786-9151-c898240463bc.json

KQL

let bl_http_methods = dynamic(['PUT', 'HEAD', 'OPTIONS', 'TRACE', 'POST']);
ImpervaWAFCloud
| where HttpRequestMethod in~ (bl_http_methods)
| extend IPCustomEntity = SrcIpAddr, UrlCustomEntity = UrlOriginal

YAML

queryFrequency: 1h
id: 7ebc9e24-319c-4786-9151-c898240463bc
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ImpervaCloudWAF/Analytic Rules/ImpervaForbiddenMethod.yaml
query: |
  let bl_http_methods = dynamic(['PUT', 'HEAD', 'OPTIONS', 'TRACE', 'POST']);
  ImpervaWAFCloud
  | where HttpRequestMethod in~ (bl_http_methods)
  | extend IPCustomEntity = SrcIpAddr, UrlCustomEntity = UrlOriginal  
queryPeriod: 1h
kind: Scheduled
status: Available
name: Imperva - Forbidden HTTP request method in request
triggerThreshold: 0
relevantTechniques:
- T1190
- T1133
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
  entityType: IP
- fieldMappings:
  - identifier: Url
    columnName: UrlCustomEntity
  entityType: URL
requiredDataConnectors:
- connectorId: ImpervaWAFCloudAPI
  dataTypes:
  - ImpervaWAFCloud
version: 1.0.0
severity: Medium
description: |
    'Detects connections with unexpected HTTP request method.'
tactics:
- InitialAccess

ARM