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

name: CiscoISE - Device PostureStatus changed to non-compliant
id: 548a2eda-d3eb-46cc-8d4b-1601551629e4
description: |
    'Detects when device changes PostureStatus from "Compliant".'
triggerThreshold: 0
entityMappings:
- fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
  entityType: IP
version: 1.0.3
triggerOperator: gt
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  
tactics:
- PrivilegeEscalation
- Persistence
kind: Scheduled
queryFrequency: 15m
severity: Medium
queryPeriod: 15m
requiredDataConnectors:
- datatypes:
  - Syslog
  connectorId: SyslogAma
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cisco ISE/Analytic Rules/CiscoISEDevicePostureStatusChanged.yaml
relevantTechniques:
- T1098

ARM