NGINX - Multiple server errors from single IP address

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Id	b3ae0033-552e-4c3c-b493-3edffb4473bb
Rulename	NGINX - Multiple server errors from single IP address
Description	Detects multiple server errors from one source in short timeframe
Severity	Medium
Tactics	Impact InitialAccess
Techniques	T1498 T1190 T1133
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/NGINXMultipleServerErrorsFromSingleIP.yaml
Version	1.0.2
Arm template	b3ae0033-552e-4c3c-b493-3edffb4473bb.json

KQL

let threshold = 100;
NGINXHTTPServer
| where tolong(HttpStatusCode) >= 500 and tolong(HttpStatusCode) <= 599 
| summarize MultipleServerErrors = count() by SrcIpAddr, bin(TimeGenerated, 5m)
| where MultipleServerErrors > threshold
| extend IPCustomEntity = SrcIpAddr

YAML

name: NGINX - Multiple server errors from single IP address
kind: Scheduled
tactics:
- Impact
- InitialAccess
triggerThreshold: 0
triggerOperator: gt
version: 1.0.2
status: Available
queryFrequency: 1h
id: b3ae0033-552e-4c3c-b493-3edffb4473bb
requiredDataConnectors:
- connectorId: CustomLogsAma
  dataTypes:
  - NGINX_CL
relevantTechniques:
- T1498
- T1190
- T1133
description: |
    'Detects multiple server errors from one source in short timeframe'
entityMappings:
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/NGINX HTTP Server/Analytic Rules/NGINXMultipleServerErrorsFromSingleIP.yaml
queryPeriod: 1h
severity: Medium
query: |
  let threshold = 100;
  NGINXHTTPServer
  | where tolong(HttpStatusCode) >= 500 and tolong(HttpStatusCode) <= 599 
  | summarize MultipleServerErrors = count() by SrcIpAddr, bin(TimeGenerated, 5m)
  | where MultipleServerErrors > threshold
  | extend IPCustomEntity = SrcIpAddr

ARM