CiscoISE - Command executed with the highest privileges by new user

let lbperiod = 60d;
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

triggerThreshold: 0
queryFrequency: 5m
requiredDataConnectors:
- connectorId: CiscoISE
  dataTypes:
  - Syslog
id: e71890a2-5f61-4790-b1ed-cf1d92d3e398
version: 1.0.0
name: CiscoISE - Command executed with the highest privileges by new user
kind: Scheduled
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cisco ISE/Analytic Rules/CiscoISECmdExecutionWithHighestPrivilegesNewUser.yaml
queryPeriod: 5m
severity: Medium
triggerOperator: gt
tactics:
- InitialAccess
- Persistence
- PrivilegeEscalation
- DefenseEvasion
- Execution
query: |
  let lbperiod = 60d;
  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  
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: AccountCustomEntity
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
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": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/e71890a2-5f61-4790-b1ed-cf1d92d3e398')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/e71890a2-5f61-4790-b1ed-cf1d92d3e398')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "CiscoISE - Command executed with the highest privileges by new user",
        "description": "'Detects command execution with PrivilegeLevel - 15 by user for wich there was no such activity detected earlier.'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let lbperiod = 60d;\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",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess",
          "Persistence",
          "PrivilegeEscalation",
          "DefenseEvasion",
          "Execution"
        ],
        "alertRuleTemplateName": "e71890a2-5f61-4790-b1ed-cf1d92d3e398",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "FullName"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ],
            "entityType": "IP"
          }
        ],
        "status": "Available",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cisco ISE/Analytic Rules/CiscoISECmdExecutionWithHighestPrivilegesNewUser.yaml",
        "templateVersion": "1.0.0"
      }
    }
  ]
}