SlackAudit - Empty User Agent

SlackAudit
| where isempty(UserAgentOriginal)
| extend AccountCustomEntity = SrcUserName

kind: Scheduled
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
description: |
    'This query shows connections to the Slack Workspace with empty User Agent.'
severity: Low
queryFrequency: 1d
triggerThreshold: 0
relevantTechniques:
- T1133
status: Available
tactics:
- InitialAccess
name: SlackAudit - Empty User Agent
id: 04528635-a5f1-438b-ab74-21ca7bc3aa32
query: |
  SlackAudit
  | where isempty(UserAgentOriginal)
  | extend AccountCustomEntity = SrcUserName  
requiredDataConnectors:
- dataTypes:
  - SlackAudit_CL
  connectorId: SlackAuditAPI
version: 1.0.0
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/SlackAudit/Analytic Rules/SlackAuditEmptyUA.yaml
queryPeriod: 1d

{
  "$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/04528635-a5f1-438b-ab74-21ca7bc3aa32')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/04528635-a5f1-438b-ab74-21ca7bc3aa32')]",
      "properties": {
        "alertRuleTemplateName": "04528635-a5f1-438b-ab74-21ca7bc3aa32",
        "customDetails": null,
        "description": "'This query shows connections to the Slack Workspace with empty User Agent.'\n",
        "displayName": "SlackAudit - Empty User Agent",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "FullName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/SlackAudit/Analytic Rules/SlackAuditEmptyUA.yaml",
        "query": "SlackAudit\n| where isempty(UserAgentOriginal)\n| extend AccountCustomEntity = SrcUserName\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "severity": "Low",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1133"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}