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Detection rules › Kusto

RecordedFuture Threat Hunting Domain All Actors

Severity
medium
Time window
1d
Group by
Id
Source
github.com/Azure/Azure-Sentinel

Recorded Future Threat Hunting domain correlation for all actors.

MITRE ATT&CK coverage

TacticTechniques
Initial AccessT1566 Phishing
Command & ControlT1568 Dynamic Resolution

Event coverage

ProviderEventTitle
SysmonEvent ID 22DNSEvent (DNS query)

Rule body kusto

id: acbf7ef6-f964-44c3-9031-7834ec68175f
name: RecordedFuture Threat Hunting Domain All Actors
description: |
  'Recorded Future Threat Hunting domain correlation for all actors.'
severity: Medium
requiredDataConnectors:
  - connectorId: ThreatIntelligenceUploadIndicatorsAPI
    dataTypes:
      - ThreatIntelIndicators
queryFrequency: 15m
queryPeriod: 1d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - InitialAccess
  - CommandAndControl
relevantTechniques:
  - T1566
  - T1568
customDetails:
  ActorInformation: RecordedFuturePortalLink
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    enabled: true
    reopenClosedIncident: false
    lookbackDuration: 1h
    matchingMethod: AllEntities
eventGroupingSettings:
  aggregationKind: AlertPerResult
alertDetailsOverride:
  alertDisplayNameFormat: '{{Description}}'
  alertDescriptionFormat: '**{{Description}}**\n\nCorrelation found on {{Domain}} from the {{Type}} table.\n'
  alertDynamicProperties:
    - alertProperty: AlertLink
      value: RecordedFuturePortalLink
query: |
  let ioc_lookBack = 1d;
  // The source table (_Im_Dns) is an ASIM parser table, but can be replaced by any infrastructure table containing domain/dns data.
  // The following workbook: Recorded Future - Domain Correlation will help researching available data and selecting tables and columns
  _Im_Dns
  | where isnotempty(Domain)
  | extend lowerDomain=tolower(Domain)
  | join kind=inner (
  ThreatIntelIndicators
  // Only look at Domain IOCs
  | where ObservableKey == 'domain-name:value'
  | where isnotempty(ObservableValue)
  // Only look at Recorded Future Threat Hunt Indicators.
  | where Data.description startswith "Recorded Future - Threat Hunt"
  // Only work with the latest indicators
  | where TimeGenerated >= ago(ioc_lookBack)
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id
  | where IsActive == true and ValidUntil > now()
  | extend lowerDomain=tolower(ObservableValue)
  ) on lowerDomain
  // select column from the source table to match with Recorded Future $left.Domain
  | mv-expand RecordedFuturePortalLink=parse_json(tostring(parse_json(Tags)))['recordedfutureportallink']
  | project Domain=ObservableValue, Description=Data.description, Type, TimeGenerated, RecordedFuturePortalLink
entityMappings:
  - entityType: DNS
    fieldMappings:
      - identifier: DomainName
        columnName: Domain
version: 1.1.0
kind: Scheduled

Stages and Predicates

Parameters

let ioc_lookBack = 1d;

Stage 1: source

_Im_Dns

Stage 2: where

| where isnotempty(Domain)

Stage 3: extend

| extend lowerDomain=tolower(Domain)

Stage 4: join

| join kind=inner (
ThreatIntelIndicators
| where ObservableKey == 'domain-name:value'
| where isnotempty(ObservableValue)
| where Data.description startswith "Recorded Future - Threat Hunt"
| where TimeGenerated >= ago(ioc_lookBack)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id
| where IsActive == true and ValidUntil > now()
| extend lowerDomain=tolower(ObservableValue)
) on lowerDomain

Stage 5: mv-expand

| mv-expand RecordedFuturePortalLink=parse_json(tostring(parse_json(Tags)))['recordedfutureportallink']

Stage 6: project

| project Domain=ObservableValue, Description=Data.description, Type, TimeGenerated, RecordedFuturePortalLink

Stage 7: summarize

summarize by Id

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
Domainis_not_null
  • (no value, null check)
IsActiveeq
  • true transforms: cased corpus 17 (kusto 17)
ObservableKeyeq
  • domain-name:value transforms: cased corpus 4 (kusto 4)
ObservableValueis_not_null
  • (no value, null check)
descriptionstarts_with
  • Recorded Future - Threat Hunt corpus 4 (kusto 4)

Output fields

Fields the rule emits when it matches. Chronicle authors list these in the outcome block; they appear on the detection and $risk_score drives alerting. Sentinel / Defender XDR rules build them up through project / summarize / extend stages. Sentinel maps these into alert fields via entityMappings and customDetails; Defender XDR custom detections surface them as alert fields directly.

FieldSource
Idsummarize