Failed Logins from Unknown or Invalid User

let FailureThreshold = 15;
let FailedLogins = Okta_CL
| where eventType_s =~ "user.session.start" and outcome_reason_s =~ "VERIFICATION_ERROR"
| summarize count() by actor_alternateId_s, client_ipAddress_s, bin(TimeGenerated, 5m)
| where count_ > FailureThreshold
| project client_ipAddress_s, actor_alternateId_s;
Okta_CL
| join kind=inner (FailedLogins) on client_ipAddress_s, actor_alternateId_s
| where eventType_s =~ "user.session.start" and outcome_reason_s =~ "VERIFICATION_ERROR"
| summarize count() by actor_alternateId_s, ClientIP = client_ipAddress_s, City = column_ifexists('client_geographicalContext_city_s', ""), Country = column_ifexists('client_geographicalContext_country_s', ""), column_ifexists('published_t', now())
| sort by column_ifexists('published_t', now()) desc
| extend timestamp = column_ifexists('published_t', now()), IPCustomEntity = ClientIP, AccountCustomEntity = actor_alternateId_s

queryFrequency: 1h
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
severity: Medium
triggerThreshold: 0
relevantTechniques:
- T1110
query: |
  let FailureThreshold = 15;
  let FailedLogins = Okta_CL
  | where eventType_s =~ "user.session.start" and outcome_reason_s =~ "VERIFICATION_ERROR"
  | summarize count() by actor_alternateId_s, client_ipAddress_s, bin(TimeGenerated, 5m)
  | where count_ > FailureThreshold
  | project client_ipAddress_s, actor_alternateId_s;
  Okta_CL
  | join kind=inner (FailedLogins) on client_ipAddress_s, actor_alternateId_s
  | where eventType_s =~ "user.session.start" and outcome_reason_s =~ "VERIFICATION_ERROR"
  | summarize count() by actor_alternateId_s, ClientIP = client_ipAddress_s, City = column_ifexists('client_geographicalContext_city_s', ""), Country = column_ifexists('client_geographicalContext_country_s', ""), column_ifexists('published_t', now())
  | sort by column_ifexists('published_t', now()) desc
  | extend timestamp = column_ifexists('published_t', now()), IPCustomEntity = ClientIP, AccountCustomEntity = actor_alternateId_s  
id: 884be6e7-e568-418e-9c12-89229865ffde
triggerOperator: gt
version: 1.0.2
requiredDataConnectors:
- connectorId: OktaSSO
  dataTypes:
  - Okta_CL
description: |
    'This query searches for numerous login attempts to the management console with an unknown or invalid user name'
queryPeriod: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Okta Single Sign-On/Analytic Rules/FailedLoginsFromUnknownOrInvalidUser.yaml
status: Available
name: Failed Logins from Unknown or Invalid User
tactics:
- CredentialAccess
kind: Scheduled

{
  "$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/884be6e7-e568-418e-9c12-89229865ffde')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/884be6e7-e568-418e-9c12-89229865ffde')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Failed Logins from Unknown or Invalid User",
        "description": "'This query searches for numerous login attempts to the management console with an unknown or invalid user name'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let FailureThreshold = 15;\nlet FailedLogins = Okta_CL\n| where eventType_s =~ \"user.session.start\" and outcome_reason_s =~ \"VERIFICATION_ERROR\"\n| summarize count() by actor_alternateId_s, client_ipAddress_s, bin(TimeGenerated, 5m)\n| where count_ > FailureThreshold\n| project client_ipAddress_s, actor_alternateId_s;\nOkta_CL\n| join kind=inner (FailedLogins) on client_ipAddress_s, actor_alternateId_s\n| where eventType_s =~ \"user.session.start\" and outcome_reason_s =~ \"VERIFICATION_ERROR\"\n| summarize count() by actor_alternateId_s, ClientIP = client_ipAddress_s, City = column_ifexists('client_geographicalContext_city_s', \"\"), Country = column_ifexists('client_geographicalContext_country_s', \"\"), column_ifexists('published_t', now())\n| sort by column_ifexists('published_t', now()) desc\n| extend timestamp = column_ifexists('published_t', now()), IPCustomEntity = ClientIP, AccountCustomEntity = actor_alternateId_s\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess"
        ],
        "techniques": [
          "T1110"
        ],
        "alertRuleTemplateName": "884be6e7-e568-418e-9c12-89229865ffde",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "AccountCustomEntity"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ]
          }
        ],
        "status": "Available",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Okta Single Sign-On/Analytic Rules/FailedLoginsFromUnknownOrInvalidUser.yaml",
        "templateVersion": "1.0.2"
      }
    }
  ]
}