Tomcat - Server errors after multiple requests from same IP

let multi_errors = TomcatEvent
| where toint(HttpStatusCode) >= 500 and toint(HttpStatusCode) <= 599
| sort by EventStartTime asc
| summarize MultipleServerErrors = count() by SrcIpAddr, bin(EventStartTime, 5m)
| where MultipleServerErrors > 10;
let error_time_table = TomcatEvent
| where toint(HttpStatusCode) >= 500 and toint(HttpStatusCode) <= 599
| summarize error_time=min(EventStartTime) by SrcIpAddr
| join kind=innerunique (multi_errors) on SrcIpAddr;
TomcatEvent
| where toint(HttpStatusCode) >= 100 and toint(HttpStatusCode) <= 399
| summarize success_time=max(EventStartTime) by SrcIpAddr
| join kind=innerunique (error_time_table) on SrcIpAddr
| extend time_between_error_and_success = datetime_diff('second', error_time, success_time)
| where time_between_error_and_success between (1 .. 300)
| project time_between_error_and_success, error_time, success_time, SrcIpAddr
| extend IPCustomEntity = SrcIpAddr

requiredDataConnectors:
- connectorId: ApacheTomcat
  dataTypes:
  - TomcatEvent
triggerOperator: gt
queryFrequency: 1h
name: Tomcat - Server errors after multiple requests from same IP
status: Available
queryPeriod: 1h
id: 875da588-4875-11ec-81d3-0242ac130003
description: |
    'Detects server errors after multiple requests from same IP address.'
severity: Medium
query: |
  let multi_errors = TomcatEvent
  | where toint(HttpStatusCode) >= 500 and toint(HttpStatusCode) <= 599
  | sort by EventStartTime asc
  | summarize MultipleServerErrors = count() by SrcIpAddr, bin(EventStartTime, 5m)
  | where MultipleServerErrors > 10;
  let error_time_table = TomcatEvent
  | where toint(HttpStatusCode) >= 500 and toint(HttpStatusCode) <= 599
  | summarize error_time=min(EventStartTime) by SrcIpAddr
  | join kind=innerunique (multi_errors) on SrcIpAddr;
  TomcatEvent
  | where toint(HttpStatusCode) >= 100 and toint(HttpStatusCode) <= 399
  | summarize success_time=max(EventStartTime) by SrcIpAddr
  | join kind=innerunique (error_time_table) on SrcIpAddr
  | extend time_between_error_and_success = datetime_diff('second', error_time, success_time)
  | where time_between_error_and_success between (1 .. 300)
  | project time_between_error_and_success, error_time, success_time, SrcIpAddr
  | extend IPCustomEntity = SrcIpAddr  
version: 1.0.0
kind: Scheduled
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Tomcat/Analytic Rules/TomcatServerErrorsAfterMultipleRequestsFromSameIP.yaml
entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
relevantTechniques:
- T1498
- T1190
- T1133
tactics:
- Impact
- InitialAccess
triggerThreshold: 0

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/875da588-4875-11ec-81d3-0242ac130003')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/875da588-4875-11ec-81d3-0242ac130003')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "Tomcat - Server errors after multiple requests from same IP",
        "description": "'Detects server errors after multiple requests from same IP address.'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let multi_errors = TomcatEvent\n| where toint(HttpStatusCode) >= 500 and toint(HttpStatusCode) <= 599\n| sort by EventStartTime asc\n| summarize MultipleServerErrors = count() by SrcIpAddr, bin(EventStartTime, 5m)\n| where MultipleServerErrors > 10;\nlet error_time_table = TomcatEvent\n| where toint(HttpStatusCode) >= 500 and toint(HttpStatusCode) <= 599\n| summarize error_time=min(EventStartTime) by SrcIpAddr\n| join kind=innerunique (multi_errors) on SrcIpAddr;\nTomcatEvent\n| where toint(HttpStatusCode) >= 100 and toint(HttpStatusCode) <= 399\n| summarize success_time=max(EventStartTime) by SrcIpAddr\n| join kind=innerunique (error_time_table) on SrcIpAddr\n| extend time_between_error_and_success = datetime_diff('second', error_time, success_time)\n| where time_between_error_and_success between (1 .. 300)\n| project time_between_error_and_success, error_time, success_time, SrcIpAddr\n| extend IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact",
          "InitialAccess"
        ],
        "techniques": [
          "T1498",
          "T1190",
          "T1133"
        ],
        "alertRuleTemplateName": "875da588-4875-11ec-81d3-0242ac130003",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ],
            "entityType": "IP"
          }
        ],
        "templateVersion": "1.0.0",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Tomcat/Analytic Rules/TomcatServerErrorsAfterMultipleRequestsFromSameIP.yaml",
        "status": "Available"
      }
    }
  ]
}