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Detection rules › Kusto

RecordedFuture Threat Hunting Hash All Actors

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

Recorded Future Threat Hunting hash correlation for all actors.

MITRE ATT&CK coverage

TacticTechniques
Initial AccessT1189 Drive-by Compromise
ExecutionT1059 Command and Scripting Interpreter
PersistenceT1554 Compromise Host Software Binary

Event coverage

ProviderEventTitle
SysmonEvent ID 11FileCreate
SysmonEvent ID 23FileDelete (File Delete archived)
SysmonEvent ID 26FileDeleteDetected (File Delete logged)
Security-AuditingEvent ID 4663An attempt was made to access an object.

Rule body kusto

id: 6db6a8e6-2959-440b-ba57-a505875fcb37
name: RecordedFuture Threat Hunting Hash All Actors
description: |
  'Recorded Future Threat Hunting hash correlation for all actors.'
severity: Medium
requiredDataConnectors:
  - connectorId: ThreatIntelligenceUploadIndicatorsAPI
    dataTypes:
      - ThreatIntelIndicators
queryFrequency: 15m
queryPeriod: 1d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - InitialAccess
  - Execution
  - Persistence
relevantTechniques:
  - T1189
  - T1059
  - T1554
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 {{Hash}} from the {{Type}} table.\n'
  alertDynamicProperties:
    - alertProperty: AlertLink
      value: RecordedFuturePortalLink
query: |
  let ioc_lookBack = 1d;
  // The source table (imFileEvent) is a ASIM parser table, but can be replaced by any infrastructure table containing Hash data.
  // The following workbook: Recorded Future - Hash Correlation will help researching available data and selecting tables and columns
  imFileEvent
  | where isnotempty(Hash)
  | extend lowerHash=tolower(Hash)
  | join kind=inner (
  ThreatIntelIndicators
  // Only look for IOCs
  | where ObservableKey contains'file:hashes'
  | 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 lowerHash=tolower(ObservableValue)
  ) on lowerHash
  // select column from the source table to match with Recorded Future ThreatIntelIndicator $left.Hash
  | mv-expand RecordedFuturePortalLink=parse_json(tostring(parse_json(Tags)))['recordedfutureportallink']
  // Hash and HashType is defaulted to data from Recorded Future, it can be changed to data from the infrastructure table.
  | project Hash=ObservableValue, HashType=extract("file:hashes.('[^']*')", 1, ObservableKey), Description=Data.description, Type, TimeGenerated, RecordedFuturePortalLink
entityMappings:
  - entityType: FileHash
    fieldMappings:
      - identifier: Value
        columnName: Hash
      - identifier: Algorithm
        columnName: HashType
version: 1.1.0
kind: Scheduled

Stages and Predicates

Parameters

let ioc_lookBack = 1d;

Stage 1: source

imFileEvent

Stage 2: where

| where isnotempty(Hash)

Stage 3: extend

| extend lowerHash=tolower(Hash)

Stage 4: join

| join kind=inner (
ThreatIntelIndicators
| where ObservableKey contains'file:hashes'
| 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 lowerHash=tolower(ObservableValue)
) on lowerHash

Stage 5: mv-expand

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

Stage 6: project

| project Hash=ObservableValue, HashType=extract("file:hashes.('[^']*')", 1, ObservableKey), 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
Hashis_not_null
  • (no value, null check)
IsActiveeq
  • true transforms: cased corpus 17 (kusto 17)
ObservableKeycontains
  • file:hashes corpus 2 (kusto 2)
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