CiscoISE - Device PostureStatus changed to non-compliant

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Id	548a2eda-d3eb-46cc-8d4b-1601551629e4
Rulename	CiscoISE - Device PostureStatus changed to non-compliant
Description	Detects when device changes PostureStatus from “Compliant”.
Severity	Medium
Tactics	PrivilegeEscalation Persistence
Techniques	T1098
Required data connectors	SyslogAma
Kind	Scheduled
Query frequency	15m
Query period	15m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cisco ISE/Analytic Rules/CiscoISEDevicePostureStatusChanged.yaml
Version	1.0.3
Arm template	548a2eda-d3eb-46cc-8d4b-1601551629e4.json

KQL

let lbtime_48h = 48h;
let lbtime_24h = 24h;
let lbtime_now = now();
let compliantIPs = CiscoISEEvent
| where TimeGenerated between (ago(lbtime_48h) .. ago(lbtime_24h))
| where PostureStatus == 'Compliant'
| summarize makelist(DstIpAddr)
;
CiscoISEEvent
| where TimeGenerated between (ago(lbtime_24h) .. lbtime_now)
| where PostureStatus != 'Compliant'
| where DstIpAddr in (compliantIPs)
| project DstIpAddr
| extend IPCustomEntity = DstIpAddr

YAML

entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
queryFrequency: 15m
name: CiscoISE - Device PostureStatus changed to non-compliant
kind: Scheduled
tactics:
- PrivilegeEscalation
- Persistence
triggerThreshold: 0
query: |
  let lbtime_48h = 48h;
  let lbtime_24h = 24h;
  let lbtime_now = now();
  let compliantIPs = CiscoISEEvent
  | where TimeGenerated between (ago(lbtime_48h) .. ago(lbtime_24h))
  | where PostureStatus == 'Compliant'
  | summarize makelist(DstIpAddr)
  ;
  CiscoISEEvent
  | where TimeGenerated between (ago(lbtime_24h) .. lbtime_now)
  | where PostureStatus != 'Compliant'
  | where DstIpAddr in (compliantIPs)
  | project DstIpAddr
  | extend IPCustomEntity = DstIpAddr  
relevantTechniques:
- T1098
triggerOperator: gt
queryPeriod: 15m
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cisco ISE/Analytic Rules/CiscoISEDevicePostureStatusChanged.yaml
severity: Medium
status: Available
id: 548a2eda-d3eb-46cc-8d4b-1601551629e4
requiredDataConnectors:
- connectorId: SyslogAma
  datatypes:
  - Syslog
version: 1.0.3
description: |
    'Detects when device changes PostureStatus from "Compliant".'

ARM

{
  "$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/548a2eda-d3eb-46cc-8d4b-1601551629e4')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/548a2eda-d3eb-46cc-8d4b-1601551629e4')]",
      "properties": {
        "alertRuleTemplateName": "548a2eda-d3eb-46cc-8d4b-1601551629e4",
        "customDetails": null,
        "description": "'Detects when device changes PostureStatus from \"Compliant\".'\n",
        "displayName": "CiscoISE - Device PostureStatus changed to non-compliant",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cisco ISE/Analytic Rules/CiscoISEDevicePostureStatusChanged.yaml",
        "query": "let lbtime_48h = 48h;\nlet lbtime_24h = 24h;\nlet lbtime_now = now();\nlet compliantIPs = CiscoISEEvent\n| where TimeGenerated between (ago(lbtime_48h) .. ago(lbtime_24h))\n| where PostureStatus == 'Compliant'\n| summarize makelist(DstIpAddr)\n;\nCiscoISEEvent\n| where TimeGenerated between (ago(lbtime_24h) .. lbtime_now)\n| where PostureStatus != 'Compliant'\n| where DstIpAddr in (compliantIPs)\n| project DstIpAddr\n| extend IPCustomEntity = DstIpAddr\n",
        "queryFrequency": "PT15M",
        "queryPeriod": "PT15M",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Persistence",
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1098"
        ],
        "templateVersion": "1.0.3",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}