Apache - Multiple client errors from single IP

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Id	15f5a956-3af9-11ec-8d3d-0242ac130003
Rulename	Apache - Multiple client errors from single IP
Description	Detects multiple client errors from one source in short timeframe
Severity	Medium
Tactics	InitialAccess
Techniques	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/ApacheHTTPServer/Analytic Rules/ApacheMultipleClientErrorsFromSingleIP.yaml
Version	1.0.3
Arm template	15f5a956-3af9-11ec-8d3d-0242ac130003.json

KQL

let threshold = 100;
ApacheHTTPServer
| where HttpStatusCode >= 400 and HttpStatusCode <= 499
| summarize MultipleClientErrors = count() by SrcIpAddr, bin(TimeGenerated, 5m)
| where MultipleClientErrors > threshold
| extend IPCustomEntity = SrcIpAddr

YAML

description: |
    'Detects multiple client errors from one source in short timeframe'
version: 1.0.3
triggerThreshold: 0
tactics:
- InitialAccess
queryPeriod: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ApacheHTTPServer/Analytic Rules/ApacheMultipleClientErrorsFromSingleIP.yaml
triggerOperator: gt
status: Available
id: 15f5a956-3af9-11ec-8d3d-0242ac130003
name: Apache - Multiple client errors from single IP
queryFrequency: 1h
severity: Medium
kind: Scheduled
entityMappings:
- fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
  entityType: IP
relevantTechniques:
- T1190
- T1133
query: |
  let threshold = 100;
  ApacheHTTPServer
  | where HttpStatusCode >= 400 and HttpStatusCode <= 499
  | summarize MultipleClientErrors = count() by SrcIpAddr, bin(TimeGenerated, 5m)
  | where MultipleClientErrors > threshold
  | extend IPCustomEntity = SrcIpAddr  
requiredDataConnectors:
- datatypes:
  - ApacheHTTPServer_CL
  connectorId: CustomLogsAma

ARM