Google Threat Intelligence - Threat Hunting Hash

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Id	8f9cd0e5-b4ab-4821-95e2-1082fcd784c7
Rulename	Google Threat Intelligence - Threat Hunting Hash
Description	Google Threat Intelligence hash correlation.
Severity	Medium
Tactics	Execution
Techniques	T1059
Required data connectors	ThreatIntelligence
Kind	Scheduled
Query frequency	30m
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Google Threat Intelligence/Analytic Rules/ThreatHunting/ThreatHuntHash.yaml
Version	1.0.0
Arm template	8f9cd0e5-b4ab-4821-95e2-1082fcd784c7.json

KQL

let ioc_lookBack = 1d;
_Im_FileEvent
| where isnotempty(Hash)
| extend lowerHash=tolower(Hash)
| join kind=inner (
ThreatIntelIndicators
| where ObservableKey contains 'file:hashes'
| where isnotempty(ObservableValue)
| where SourceSystem == "Google Threat Intelligence"
| where TimeGenerated >= ago(ioc_lookBack)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id
| where IsActive == true and (isnull(ValidUntil) or ValidUntil > now())
| extend lowerHash=tolower(ObservableValue)
) on lowerHash
| project Hash=ObservableValue, HashType=extract("file:hashes.('[^']*')", 1, ObservableKey), Description=Data.description, Type, TimeGenerated

YAML

name: Google Threat Intelligence - Threat Hunting Hash
severity: Medium
description: |
    'Google Threat Intelligence hash correlation.'
version: 1.0.0
requiredDataConnectors:
- dataTypes:
  - ThreatIntelIndicators
  connectorId: ThreatIntelligence
relevantTechniques:
- T1059
entityMappings:
- entityType: FileHash
  fieldMappings:
  - identifier: Value
    columnName: Hash
  - identifier: Algorithm
    columnName: HashType
kind: Scheduled
triggerThreshold: 0
tactics:
- Execution
queryPeriod: 1d
incidentConfiguration:
  groupingConfiguration:
    reopenClosedIncident: false
    lookbackDuration: 1h
    matchingMethod: AllEntities
    enabled: true
  createIncident: true
alertDetailsOverride:
  alertDescriptionFormat: Correlation found from the {{Type}} table.
  alertDisplayNameFormat: Google Threat Intelligence Match
triggerOperator: gt
query: |
  let ioc_lookBack = 1d;
  _Im_FileEvent
  | where isnotempty(Hash)
  | extend lowerHash=tolower(Hash)
  | join kind=inner (
  ThreatIntelIndicators
  | where ObservableKey contains 'file:hashes'
  | where isnotempty(ObservableValue)
  | where SourceSystem == "Google Threat Intelligence"
  | where TimeGenerated >= ago(ioc_lookBack)
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id
  | where IsActive == true and (isnull(ValidUntil) or ValidUntil > now())
  | extend lowerHash=tolower(ObservableValue)
  ) on lowerHash
  | project Hash=ObservableValue, HashType=extract("file:hashes.('[^']*')", 1, ObservableKey), Description=Data.description, Type, TimeGenerated  
eventGroupingSettings:
  aggregationKind: AlertPerResult
queryFrequency: 30m
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Google Threat Intelligence/Analytic Rules/ThreatHunting/ThreatHuntHash.yaml
id: 8f9cd0e5-b4ab-4821-95e2-1082fcd784c7

ARM