GSA - Detect Connections Outside Operational Hours

let starttime = todatetime('{{StartTimeISO}}');
let endtime = todatetime('{{EndTimeISO}}');
let operational_start_hour = 8; // Start of operational hours (8 AM)
let operational_end_hour = 18; // End of operational hours (6 PM)
NetworkAccessTraffic
| where TimeGenerated between(starttime .. endtime)
| extend HourOfDay = datetime_part('hour', TimeGenerated)
| where HourOfDay < operational_start_hour or HourOfDay >= operational_end_hour
| project TimeGenerated, UserPrincipalName, SourceIp, DestinationIp, DestinationPort, Action, DeviceId, DeviceOperatingSystem, ConnectionId
| extend IPCustomEntity = SourceIp, AccountCustomEntity = UserPrincipalName

id: 4c9f0a9e-44d7-4c9b-b7f0-f6a6e0d8f8fa
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Global Secure Access/Analytic Rules/Identity - AfterHoursActivity.yaml
requiredDataConnectors:
- dataTypes:
  - EnrichedMicrosoft365AuditLogs
  connectorId: AzureActiveDirectory
description: This query identifies connections that occur outside of the defined operational hours. It helps in monitoring and flagging any unusual activity that may occur during non-business hours, indicating potential security concerns or policy violations.
severity: High
queryPeriod: 24h
kind: Scheduled
tactics:
- InitialAccess
queryFrequency: 1h
query: |
  let starttime = todatetime('{{StartTimeISO}}');
  let endtime = todatetime('{{EndTimeISO}}');
  let operational_start_hour = 8; // Start of operational hours (8 AM)
  let operational_end_hour = 18; // End of operational hours (6 PM)
  NetworkAccessTraffic
  | where TimeGenerated between(starttime .. endtime)
  | extend HourOfDay = datetime_part('hour', TimeGenerated)
  | where HourOfDay < operational_start_hour or HourOfDay >= operational_end_hour
  | project TimeGenerated, UserPrincipalName, SourceIp, DestinationIp, DestinationPort, Action, DeviceId, DeviceOperatingSystem, ConnectionId
  | extend IPCustomEntity = SourceIp, AccountCustomEntity = UserPrincipalName  
version: 1.0.1
triggerThreshold: 0
name: GSA - Detect Connections Outside Operational Hours
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountCustomEntity
    identifier: Name
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
status: Available
relevantTechniques:
- T1078
- T1133

{
  "$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/4c9f0a9e-44d7-4c9b-b7f0-f6a6e0d8f8fa')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4c9f0a9e-44d7-4c9b-b7f0-f6a6e0d8f8fa')]",
      "properties": {
        "alertRuleTemplateName": "4c9f0a9e-44d7-4c9b-b7f0-f6a6e0d8f8fa",
        "customDetails": null,
        "description": "This query identifies connections that occur outside of the defined operational hours. It helps in monitoring and flagging any unusual activity that may occur during non-business hours, indicating potential security concerns or policy violations.",
        "displayName": "GSA - Detect Connections Outside Operational Hours",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "Name"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Global Secure Access/Analytic Rules/Identity - AfterHoursActivity.yaml",
        "query": "let starttime = todatetime('{{StartTimeISO}}');\nlet endtime = todatetime('{{EndTimeISO}}');\nlet operational_start_hour = 8; // Start of operational hours (8 AM)\nlet operational_end_hour = 18; // End of operational hours (6 PM)\nNetworkAccessTraffic\n| where TimeGenerated between(starttime .. endtime)\n| extend HourOfDay = datetime_part('hour', TimeGenerated)\n| where HourOfDay < operational_start_hour or HourOfDay >= operational_end_hour\n| project TimeGenerated, UserPrincipalName, SourceIp, DestinationIp, DestinationPort, Action, DeviceId, DeviceOperatingSystem, ConnectionId\n| extend IPCustomEntity = SourceIp, AccountCustomEntity = UserPrincipalName\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT24H",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1078",
          "T1133"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}