CiscoISE - Command executed with the highest privileges by new user

let lbperiod = 14d;
let lbtime = 15m;
let knownPrivUsers =
CiscoISEEvent
| where TimeGenerated between (ago(lbperiod) .. ago(lbtime))
| where PrivilegeLevel == '15'
| summarize makelist(DstUserName)
;
CiscoISEEvent
| where TimeGenerated > ago(lbtime)
| where PrivilegeLevel == '15'
| where DstUserName !in (knownPrivUsers)
| project TimeGenerated, SrcIpAddr, DstIpAddr, DstUserName, CmdSet
| extend AccountCustomEntity = DstUserName
| extend IPCustomEntity = SrcIpAddr

OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cisco ISE/Analytic Rules/CiscoISECmdExecutionWithHighestPrivilegesNewUser.yaml
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: AccountCustomEntity
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
  entityType: IP
kind: Scheduled
query: |
  let lbperiod = 14d;
  let lbtime = 15m;
  let knownPrivUsers =
  CiscoISEEvent
  | where TimeGenerated between (ago(lbperiod) .. ago(lbtime))
  | where PrivilegeLevel == '15'
  | summarize makelist(DstUserName)
  ;
  CiscoISEEvent
  | where TimeGenerated > ago(lbtime)
  | where PrivilegeLevel == '15'
  | where DstUserName !in (knownPrivUsers)
  | project TimeGenerated, SrcIpAddr, DstIpAddr, DstUserName, CmdSet
  | extend AccountCustomEntity = DstUserName
  | extend IPCustomEntity = SrcIpAddr  
triggerOperator: gt
version: 1.0.1
queryPeriod: 5m
name: CiscoISE - Command executed with the highest privileges by new user
severity: Medium
requiredDataConnectors:
- dataTypes:
  - Syslog
  connectorId: CiscoISE
triggerThreshold: 0
tactics:
- InitialAccess
- Persistence
- PrivilegeEscalation
- DefenseEvasion
- Execution
queryFrequency: 5m
id: e71890a2-5f61-4790-b1ed-cf1d92d3e398
status: Available
description: |
    'Detects command execution with PrivilegeLevel - 15 by user for wich there was no such activity detected earlier.'

{
  "$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/e71890a2-5f61-4790-b1ed-cf1d92d3e398')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/e71890a2-5f61-4790-b1ed-cf1d92d3e398')]",
      "properties": {
        "alertRuleTemplateName": "e71890a2-5f61-4790-b1ed-cf1d92d3e398",
        "customDetails": null,
        "description": "'Detects command execution with PrivilegeLevel - 15 by user for wich there was no such activity detected earlier.'\n",
        "displayName": "CiscoISE - Command executed with the highest privileges by new user",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cisco ISE/Analytic Rules/CiscoISECmdExecutionWithHighestPrivilegesNewUser.yaml",
        "query": "let lbperiod = 14d;\nlet lbtime = 15m;\nlet knownPrivUsers =\nCiscoISEEvent\n| where TimeGenerated between (ago(lbperiod) .. ago(lbtime))\n| where PrivilegeLevel == '15'\n| summarize makelist(DstUserName)\n;\nCiscoISEEvent\n| where TimeGenerated > ago(lbtime)\n| where PrivilegeLevel == '15'\n| where DstUserName !in (knownPrivUsers)\n| project TimeGenerated, SrcIpAddr, DstIpAddr, DstUserName, CmdSet\n| extend AccountCustomEntity = DstUserName\n| extend IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT5M",
        "severity": "Medium",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion",
          "Execution",
          "InitialAccess",
          "Persistence",
          "PrivilegeEscalation"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}