Denial of Service (Microsoft Defender for IoT)

Status: available
Severity: high
Time window: 5m
Source: github.com/Azure/Azure-Sentinel

'This alert leverages Defender for IoT to detect attacks that would prevent the use or proper operation of a DCS system including Denial of Service events.'

MITRE ATT&CK coverage

Tactic	Techniques
Inhibit Response Function	`T0814` Denial of Service

Rule body

id: e068187a-01f5-4737-bc13-25db4027b7ea
name: Denial of Service (Microsoft Defender for IoT)
description: |
  'This alert leverages Defender for IoT to detect attacks that would prevent the use or proper operation of a DCS system including Denial of Service events.'
severity: High
status: Available
requiredDataConnectors:
  - connectorId: IoT
    dataTypes:
      - SecurityAlert (ASC for IoT)
queryFrequency: 5m
queryPeriod: 5m
triggerOperator: gt
triggerThreshold: 0
tactics:
  - InhibitResponseFunction
relevantTechniques:
  - T0814
query: |
  SecurityAlert
  | where ProviderName == "IoTSecurity"
  | where AlertName == "Suspicion of Denial Of Service Attack"
  | 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
entityMappings:
sentinelEntitiesMappings:
  - columnName: Entities
eventGroupingSettings:
  aggregationKind: AlertPerResult
customDetails:
  Sensor: DeviceId
  Protocol: Protocol
  VendorOriginalId: VendorOriginalId
  AlertManagementUri: AlertManagementUri
alertDetailsOverride:
  alertDisplayNameFormat: (MDIoT) {{AlertName}}
  alertDescriptionFormat: (MDIoT) {{Description}}
  alertTacticsColumnName: Tactics
  alertSeverityColumnName: AlertSeverity
  alertDynamicProperties: 
    - alertProperty: ProductName
      value: ProductName
    - alertProperty: RemediationSteps
      value: RemediationSteps
    - alertProperty: Techniques
      value: Techniques
    - alertProperty: ProductComponentName
      value: ProductComponentName
    - alertProperty: AlertLink
      value: AlertLink
version: 1.0.3
kind: Scheduled

Stages and Predicates

Stage 1: `source`

SecurityAlert

Stage 2: `where`

| where ProviderName == "IoTSecurity"

Stage 3: `where`

| where AlertName == "Suspicion of Denial Of Service Attack"

Stage 4: `extend`

| extend ExtendedProperties = parse_json(ExtendedProperties)

Stage 5: `where`

| where tostring(ExtendedProperties.isNew) == "True"

Stage 6: `extend`

| 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)

Stage 7: `project`

| project
  TimeGenerated,
  DeviceId,
  ProductName,
  ProductComponentName,
  AlertSeverity,
  AlertName,
  Description,
  Protocol,
  SourceDeviceAddress,
  DestDeviceAddress,
  RemediationSteps,
  Tactics,
  Entities,
  VendorOriginalId,
  AlertLink,
  AlertManagementUri,
  Techniques

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`AlertName`	eq	`Suspicion of Denial Of Service Attack`	`field:"AlertName" kind:eq value:"Suspicion of Denial Of Service Attack"`
`ProviderName`	eq	`IoTSecurity`	`field:"ProviderName" kind:eq value:"IoTSecurity"`
`isNew`	eq	`True` transforms: `tostring`	`field:"isNew" kind:eq value:"True"`

Output fields

These fields are emitted when the rule matches.

Field	Source
`AlertLink`	`project`
`AlertManagementUri`	`project`
`AlertName`	`project`
`AlertSeverity`	`project`
`Description`	`project`
`DestDeviceAddress`	`project`
`DeviceId`	`project`
`Entities`	`project`
`ProductComponentName`	`project`
`ProductName`	`project`
`Protocol`	`project`
`RemediationSteps`	`project`
`SourceDeviceAddress`	`project`
`Tactics`	`project`
`Techniques`	`project`
`TimeGenerated`	`project`
`VendorOriginalId`	`project`

Denial of Service (Microsoft Defender for IoT)

MITRE ATT&CK coverage

Rule body

Stages and Predicates

Stage 1: source

Stage 2: where

Stage 3: where

Stage 4: extend

Stage 5: where

Stage 6: extend

Stage 7: project