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

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

ARM