Microsoft Sentinel Analytic Rules
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Tomcat - Multiple client errors from single IP address

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Id4fa66058-4870-11ec-81d3-0242ac130003
RulenameTomcat - Multiple client errors from single IP address
DescriptionDetects multiple client errors from one source in short timeframe
SeverityMedium
TacticsInitialAccess
TechniquesT1190
T1133
Required data connectorsCustomLogsAma
KindScheduled
Query frequency1h
Query period1h
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Tomcat/Analytic Rules/TomcatMultipleClientErrorsFromSingleIP.yaml
Version1.0.2
Arm template4fa66058-4870-11ec-81d3-0242ac130003.json
Deploy To Azure
let threshold = 100;
TomcatEvent
| where HttpStatusCode >= 400 and HttpStatusCode <= 499 
| summarize MultipleClientErrors = count() by SrcIpAddr, bin(TimeGenerated, 5m)
| where MultipleClientErrors > threshold
| extend IPCustomEntity = SrcIpAddr
queryPeriod: 1h
kind: Scheduled
version: 1.0.2
name: Tomcat - Multiple client errors from single IP address
relevantTechniques:
- T1190
- T1133
severity: Medium
description: |
    'Detects multiple client errors from one source in short timeframe'
requiredDataConnectors:
- connectorId: CustomLogsAma
  datatypes:
  - Tomcat_CL
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  
tactics:
- InitialAccess
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Tomcat/Analytic Rules/TomcatMultipleClientErrorsFromSingleIP.yaml
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
  entityType: IP
triggerThreshold: 0
id: 4fa66058-4870-11ec-81d3-0242ac130003
triggerOperator: gt
queryFrequency: 1h
status: Available
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/4fa66058-4870-11ec-81d3-0242ac130003')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4fa66058-4870-11ec-81d3-0242ac130003')]",
      "properties": {
        "alertRuleTemplateName": "4fa66058-4870-11ec-81d3-0242ac130003",
        "customDetails": null,
        "description": "'Detects multiple client errors from one source in short timeframe'\n",
        "displayName": "Tomcat - Multiple client errors from single IP address",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Tomcat/Analytic Rules/TomcatMultipleClientErrorsFromSingleIP.yaml",
        "query": "let threshold = 100;\nTomcatEvent\n| where HttpStatusCode >= 400 and HttpStatusCode <= 499 \n| summarize MultipleClientErrors = count() by SrcIpAddr, bin(TimeGenerated, 5m)\n| where MultipleClientErrors > threshold\n| extend IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1133",
          "T1190"
        ],
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}