Tomcat - Multiple client errors from single IP address

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Id	4fa66058-4870-11ec-81d3-0242ac130003
Rulename	Tomcat - Multiple client errors from single IP address
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/Tomcat/Analytic Rules/TomcatMultipleClientErrorsFromSingleIP.yaml
Version	1.0.2
Arm template	4fa66058-4870-11ec-81d3-0242ac130003.json

KQL

let threshold = 100;
TomcatEvent
| 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'
kind: Scheduled
queryFrequency: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Tomcat/Analytic Rules/TomcatMultipleClientErrorsFromSingleIP.yaml
status: Available
triggerOperator: gt
severity: Medium
relevantTechniques:
- T1190
- T1133
triggerThreshold: 0
name: Tomcat - Multiple client errors from single IP address
entityMappings:
- fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
  entityType: IP
requiredDataConnectors:
- connectorId: CustomLogsAma
  datatypes:
  - Tomcat_CL
id: 4fa66058-4870-11ec-81d3-0242ac130003
queryPeriod: 1h
tactics:
- InitialAccess
version: 1.0.2
query: |
  let threshold = 100;
  TomcatEvent
  | where HttpStatusCode >= 400 and HttpStatusCode <= 499 
  | summarize MultipleClientErrors = count() by SrcIpAddr, bin(TimeGenerated, 5m)
  | where MultipleClientErrors > threshold
  | extend IPCustomEntity = SrcIpAddr

ARM