PLC unsecure key state Microsoft Defender for IoT

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Id	f9df500a-e2a4-4104-a517-dc1d85bb654f
Rulename	PLC unsecure key state (Microsoft Defender for IoT)
Description	This alert leverages Defender for IoT to detect PLC operating mode changes indicating the PLC is potentially insecure. If the PLC is compromised, devices that interact with it may be impacted. This may affect overall system security and safety.
Severity	Low
Tactics	Execution
Techniques	T0858
Required data connectors	IoT
Kind	Scheduled
Query frequency	3h
Query period	3h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/IoTOTThreatMonitoringwithDefenderforIoT/Analytic Rules/IoTInsecurePLC.yaml
Version	1.0.3
Arm template	f9df500a-e2a4-4104-a517-dc1d85bb654f.json

KQL

SecurityAlert
| where ProviderName == "IoTSecurity"
| where AlertName has "PLC Operating Mode Changed"
| extend ExtendedProperties = parse_json(ExtendedProperties)
| where tostring(ExtendedProperties.isNew) == "True"
| extend DeviceId = tostring(ExtendedProperties.DeviceId), 
         SourceDeviceAddress = tostring(ExtendedProperties.SourceDeviceAddress), 
         DestDeviceAddress = tostring(ExtendedProperties.DestinationDeviceAddress), 
         RemediationSteps = tostring(parse_json(RemediationSteps)[0]), 
         Protocol = tostring(ExtendedProperties.Protocol), 
         AlertManagementUri = tostring(ExtendedProperties.AlertManagementUri)
| project
  TimeGenerated,
  DeviceId,
  ProductName,
  ProductComponentName,
  AlertSeverity,
  AlertName,
  Description,
  Protocol,
  SourceDeviceAddress,
  DestDeviceAddress,
  RemediationSteps,
  Tactics,
  Entities,
  VendorOriginalId,
  AlertLink,
  AlertManagementUri,
  Techniques

YAML

queryPeriod: 3h
query: |
  SecurityAlert
  | where ProviderName == "IoTSecurity"
  | where AlertName has "PLC Operating Mode Changed"
  | extend ExtendedProperties = parse_json(ExtendedProperties)
  | where tostring(ExtendedProperties.isNew) == "True"
  | extend DeviceId = tostring(ExtendedProperties.DeviceId), 
           SourceDeviceAddress = tostring(ExtendedProperties.SourceDeviceAddress), 
           DestDeviceAddress = tostring(ExtendedProperties.DestinationDeviceAddress), 
           RemediationSteps = tostring(parse_json(RemediationSteps)[0]), 
           Protocol = tostring(ExtendedProperties.Protocol), 
           AlertManagementUri = tostring(ExtendedProperties.AlertManagementUri)
  | project
    TimeGenerated,
    DeviceId,
    ProductName,
    ProductComponentName,
    AlertSeverity,
    AlertName,
    Description,
    Protocol,
    SourceDeviceAddress,
    DestDeviceAddress,
    RemediationSteps,
    Tactics,
    Entities,
    VendorOriginalId,
    AlertLink,
    AlertManagementUri,
    Techniques  
name: PLC unsecure key state (Microsoft Defender for IoT)
entityMappings: 
queryFrequency: 3h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/IoTOTThreatMonitoringwithDefenderforIoT/Analytic Rules/IoTInsecurePLC.yaml
alertDetailsOverride:
  alertDynamicProperties:
  - value: ProductName
    alertProperty: ProductName
  - value: RemediationSteps
    alertProperty: RemediationSteps
  - value: Techniques
    alertProperty: Techniques
  - value: ProductComponentName
    alertProperty: ProductComponentName
  - value: AlertLink
    alertProperty: AlertLink
  alertSeverityColumnName: AlertSeverity
  alertDescriptionFormat: (MDIoT) {{Description}}
  alertDisplayNameFormat: (MDIoT) {{AlertName}}
  alertTacticsColumnName: Tactics
requiredDataConnectors:
- connectorId: IoT
  dataTypes:
  - SecurityAlert (ASC for IoT)
description: |
    'This alert leverages Defender for IoT to detect PLC operating mode changes indicating the PLC is potentially insecure. If the PLC is compromised, devices that interact with it may be impacted. This may affect overall system security and safety.'
kind: Scheduled
version: 1.0.3
eventGroupingSettings:
  aggregationKind: AlertPerResult
sentinelEntitiesMappings:
- columnName: Entities
status: Available
severity: Low
relevantTechniques:
- T0858
triggerOperator: gt
triggerThreshold: 0
customDetails:
  Sensor: DeviceId
  Protocol: Protocol
  VendorOriginalId: VendorOriginalId
  AlertManagementUri: AlertManagementUri
tactics:
- Execution
id: f9df500a-e2a4-4104-a517-dc1d85bb654f

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