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Detection rules › Kusto

CiscoISE - Device PostureStatus changed to non-compliant

Status
available
Severity
medium
Time window
15m
Source
github.com/Azure/Azure-Sentinel

'Detects when device changes PostureStatus from "Compliant".'

MITRE ATT&CK coverage

TacticTechniques
Persistence
Privilege Escalation

Rule body

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

Stages and Predicates

Parameters

let lbtime_48h = 48h;
let lbtime_24h = 24h;
let lbtime_now = now();

Let binding: compliantIPs used in Stage 4

let compliantIPs = CiscoISEEvent
| where TimeGenerated between (ago(lbtime_48h) .. ago(lbtime_24h))
| where PostureStatus == 'Compliant'
| summarize makelist(DstIpAddr);

Stage 1: source

CiscoISEEvent

Stage 2: where

| where TimeGenerated between (ago(lbtime_24h) .. lbtime_now)

Stage 3: where

| where PostureStatus != 'Compliant'

Stage 4: where

| where DstIpAddr in (compliantIPs)

Stage 5: project

| project DstIpAddr

Stage 6: extend

| extend IPCustomEntity = DstIpAddr

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
DstIpAddrin
  • compliantIPs
field:"dest_ip" kind:in value:"compliantIPs"
PostureStatusne
  • Compliant
field:"PostureStatus" kind:ne value:"Compliant"

Output fields

These fields are emitted when the rule matches.

FieldSource
DstIpAddrproject
IPCustomEntityextend