Google Threat Intelligence - Threat Hunting Hash

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

entityMappings:
- entityType: FileHash
  fieldMappings:
  - columnName: Hash
    identifier: Value
  - columnName: HashType
    identifier: Algorithm
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
id: 8f9cd0e5-b4ab-4821-95e2-1082fcd784c7
queryFrequency: 30m
alertDetailsOverride:
  alertDisplayNameFormat: Google Threat Intelligence Match
  alertDescriptionFormat: Correlation found from the {{Type}} table.
eventGroupingSettings:
  aggregationKind: AlertPerResult
version: 1.0.0
severity: Medium
relevantTechniques:
- T1059
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    lookbackDuration: 1h
    reopenClosedIncident: false
    enabled: true
    matchingMethod: AllEntities
kind: Scheduled
tactics:
- Execution
requiredDataConnectors:
- dataTypes:
  - ThreatIntelIndicators
  connectorId: ThreatIntelligence
description: |
  'Google Threat Intelligence hash correlation.'
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Google%20Threat%20Intelligence/Analytic%20Rules/ThreatHunting/ThreatHuntHash.yaml
triggerOperator: gt
name: Google Threat Intelligence - Threat Hunting Hash
triggerThreshold: 0
queryPeriod: 1d

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/8f9cd0e5-b4ab-4821-95e2-1082fcd784c7')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/8f9cd0e5-b4ab-4821-95e2-1082fcd784c7')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "Correlation found from the {{Type}} table.",
          "alertDisplayNameFormat": "Google Threat Intelligence Match"
        },
        "alertRuleTemplateName": "8f9cd0e5-b4ab-4821-95e2-1082fcd784c7",
        "customDetails": null,
        "description": "'Google Threat Intelligence hash correlation.'\n",
        "displayName": "Google Threat Intelligence - Threat Hunting Hash",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "FileHash",
            "fieldMappings": [
              {
                "columnName": "Hash",
                "identifier": "Value"
              },
              {
                "columnName": "HashType",
                "identifier": "Algorithm"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": true,
            "lookbackDuration": "PT1H",
            "matchingMethod": "AllEntities",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Google%20Threat%20Intelligence/Analytic%20Rules/ThreatHunting/ThreatHuntHash.yaml",
        "query": "let ioc_lookBack = 1d;\n_Im_FileEvent\n| where isnotempty(Hash)\n| extend lowerHash=tolower(Hash)\n| join kind=inner (\nThreatIntelIndicators\n| where ObservableKey contains 'file:hashes'\n| where isnotempty(ObservableValue)\n| where SourceSystem == \"Google Threat Intelligence\"\n| where TimeGenerated >= ago(ioc_lookBack)\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id\n| where IsActive == true and (isnull(ValidUntil) or ValidUntil > now())\n| extend lowerHash=tolower(ObservableValue)\n) on lowerHash\n| project Hash=ObservableValue, HashType=extract(\"file:hashes.('[^']*')\", 1, ObservableKey), Description=Data.description, Type, TimeGenerated\n",
        "queryFrequency": "PT30M",
        "queryPeriod": "P1D",
        "severity": "Medium",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Execution"
        ],
        "techniques": [
          "T1059"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}