Microsoft Sentinel Analytic Rules
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Tenablead Password Guessing

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Id44d74560-0cd1-4e73-a8f5-d16eeeba219e
RulenameTenable.ad Password Guessing
DescriptionSearches for bruteforce Password Guessing attacks.
SeverityHigh
TacticsCredentialAccess
TechniquesT1110
Required data connectorsTenable.ad
KindScheduled
Query frequency2h
Query period2h
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/TenableAD/Analytic Rules/TenableAdPasswordGuessing.yaml
Version1.0.1
Arm template44d74560-0cd1-4e73-a8f5-d16eeeba219e.json
Deploy To Azure
// For the query to work properly, make sure you have imported the afad_parser.kql parser into the workspace
// Retrieve the parser here: https://raw.githubusercontent.com/tenable/Azure-Sentinel/Tenable.ad-connector/Solutions/TenableAD/Parsers/afad_parser.kql
// Then, create the Kusto Function with alias afad_parser
afad_parser
  | where MessageType == 2 and Codename == "Password Guessing"
  | extend HostName = tostring(split(Host, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Host, '.'), 1, -1), '.'))
kind: Scheduled
triggerThreshold: 0
relevantTechniques:
- T1110
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/TenableAD/Analytic Rules/TenableAdPasswordGuessing.yaml
requiredDataConnectors:
- dataTypes:
  - Tenable_ad_CL
  connectorId: Tenable.ad
queryPeriod: 2h
tactics:
- CredentialAccess
severity: High
triggerOperator: gt
description: |
    'Searches for bruteforce Password Guessing attacks.'
query: |
  // For the query to work properly, make sure you have imported the afad_parser.kql parser into the workspace
  // Retrieve the parser here: https://raw.githubusercontent.com/tenable/Azure-Sentinel/Tenable.ad-connector/Solutions/TenableAD/Parsers/afad_parser.kql
  // Then, create the Kusto Function with alias afad_parser
  afad_parser
    | where MessageType == 2 and Codename == "Password Guessing"
    | extend HostName = tostring(split(Host, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Host, '.'), 1, -1), '.'))  
name: Tenable.ad Password Guessing
version: 1.0.1
id: 44d74560-0cd1-4e73-a8f5-d16eeeba219e
queryFrequency: 2h
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: HostName
    identifier: HostName
  - columnName: DnsDomain
    identifier: DnsDomain
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/44d74560-0cd1-4e73-a8f5-d16eeeba219e')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/44d74560-0cd1-4e73-a8f5-d16eeeba219e')]",
      "properties": {
        "alertRuleTemplateName": "44d74560-0cd1-4e73-a8f5-d16eeeba219e",
        "customDetails": null,
        "description": "'Searches for bruteforce Password Guessing attacks.'\n",
        "displayName": "Tenable.ad Password Guessing",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "HostName",
                "identifier": "HostName"
              },
              {
                "columnName": "DnsDomain",
                "identifier": "DnsDomain"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/TenableAD/Analytic Rules/TenableAdPasswordGuessing.yaml",
        "query": "// For the query to work properly, make sure you have imported the afad_parser.kql parser into the workspace\n// Retrieve the parser here: https://raw.githubusercontent.com/tenable/Azure-Sentinel/Tenable.ad-connector/Solutions/TenableAD/Parsers/afad_parser.kql\n// Then, create the Kusto Function with alias afad_parser\nafad_parser\n  | where MessageType == 2 and Codename == \"Password Guessing\"\n  | extend HostName = tostring(split(Host, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Host, '.'), 1, -1), '.'))\n",
        "queryFrequency": "PT2H",
        "queryPeriod": "PT2H",
        "severity": "High",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess"
        ],
        "techniques": [
          "T1110"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}