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

severity: Medium
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ImpervaCloudWAF/Analytic Rules/ImpervaForbiddenMethod.yaml
id: 7ebc9e24-319c-4786-9151-c898240463bc
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
  entityType: IP
- fieldMappings:
  - identifier: Url
    columnName: UrlCustomEntity
  entityType: URL
kind: Scheduled
status: Available
tactics:
- InitialAccess
queryFrequency: 1h
requiredDataConnectors:
- connectorId: ImpervaWAFCloudAPI
  dataTypes:
  - ImpervaWAFCloud
relevantTechniques:
- T1190
- T1133
version: 1.0.0
description: |
    'Detects connections with unexpected HTTP request method.'
triggerThreshold: 0
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
name: Imperva - Forbidden HTTP request method in request

ARM