TI map File Hash to DeviceFileEvents Event

let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let DeviceFileEvents_ = (union
(DeviceFileEvents | where TimeGenerated > ago(dt_lookBack) | where isnotempty(SHA1) | extend FileHashValue = SHA1),
(DeviceFileEvents | where TimeGenerated > ago(dt_lookBack) | where isnotempty(SHA256) | extend FileHashValue = SHA256));
let Hashes = DeviceFileEvents_ | distinct FileHashValue;
ThreatIntelligenceIndicator
| where isnotempty(FileHashValue)
| where TimeGenerated > ago(ioc_lookBack)
| where FileHashValue in (Hashes)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true and ExpirationDateTime > now()
| where Description !contains_cs "State: inactive;" and Description !contains_cs "State: falsepos;"
| join kind=innerunique (DeviceFileEvents_) on $left.FileHashValue == $right.FileHashValue
| where TimeGenerated < ExpirationDateTime
| summarize TimeGenerated = arg_max(TimeGenerated, *) by  IndicatorId, DeviceId
| project TimeGenerated, TrafficLightProtocolLevel, Description, ActivityGroupNames, IndicatorId, ThreatType, FileHashValue, FileHashType, ExpirationDateTime, ConfidenceScore, ActionType, DeviceId, DeviceName, FolderPath, RequestAccountDomain, RequestAccountName, RequestAccountSid, MachineGroup
| extend timestamp = TimeGenerated

id: bc0eca2e-db50-44e6-8fa3-b85f91ff5ee7
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/FileHashEntity_DeviceFileEvents.yaml
requiredDataConnectors:
- dataTypes:
  - DeviceFileEvents
  connectorId: MicrosoftThreatProtection
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligence
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligenceTaxii
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: MicrosoftDefenderThreatIntelligence
description: |
    'Identifies a match in DeviceFileEvents Event data from any FileHash IOC from TI'
severity: Medium
queryPeriod: 14d
kind: Scheduled
tactics:
- CommandAndControl
queryFrequency: 1h
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
  let DeviceFileEvents_ = (union
  (DeviceFileEvents | where TimeGenerated > ago(dt_lookBack) | where isnotempty(SHA1) | extend FileHashValue = SHA1),
  (DeviceFileEvents | where TimeGenerated > ago(dt_lookBack) | where isnotempty(SHA256) | extend FileHashValue = SHA256));
  let Hashes = DeviceFileEvents_ | distinct FileHashValue;
  ThreatIntelligenceIndicator
  | where isnotempty(FileHashValue)
  | where TimeGenerated > ago(ioc_lookBack)
  | where FileHashValue in (Hashes)
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
  | where Active == true and ExpirationDateTime > now()
  | where Description !contains_cs "State: inactive;" and Description !contains_cs "State: falsepos;"
  | join kind=innerunique (DeviceFileEvents_) on $left.FileHashValue == $right.FileHashValue
  | where TimeGenerated < ExpirationDateTime
  | summarize TimeGenerated = arg_max(TimeGenerated, *) by  IndicatorId, DeviceId
  | project TimeGenerated, TrafficLightProtocolLevel, Description, ActivityGroupNames, IndicatorId, ThreatType, FileHashValue, FileHashType, ExpirationDateTime, ConfidenceScore, ActionType, DeviceId, DeviceName, FolderPath, RequestAccountDomain, RequestAccountName, RequestAccountSid, MachineGroup
  | extend timestamp = TimeGenerated  
version: 1.0.1
triggerThreshold: 0
name: TI map File Hash to DeviceFileEvents Event
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: RequestAccountName
    identifier: Name
  - columnName: RequestAccountSid
    identifier: Sid
  - columnName: RequestAccountDomain
    identifier: NTDomain
- entityType: FileHash
  fieldMappings:
  - columnName: FileHashValue
    identifier: Value
  - columnName: FileHashType
    identifier: Algorithm
- entityType: Host
  fieldMappings:
  - columnName: DeviceName
    identifier: HostName
relevantTechniques:
- T1071

{
  "$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/bc0eca2e-db50-44e6-8fa3-b85f91ff5ee7')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/bc0eca2e-db50-44e6-8fa3-b85f91ff5ee7')]",
      "properties": {
        "alertRuleTemplateName": "bc0eca2e-db50-44e6-8fa3-b85f91ff5ee7",
        "customDetails": null,
        "description": "'Identifies a match in DeviceFileEvents Event data from any FileHash IOC from TI'\n",
        "displayName": "TI map File Hash to DeviceFileEvents Event",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "RequestAccountName",
                "identifier": "Name"
              },
              {
                "columnName": "RequestAccountSid",
                "identifier": "Sid"
              },
              {
                "columnName": "RequestAccountDomain",
                "identifier": "NTDomain"
              }
            ]
          },
          {
            "entityType": "FileHash",
            "fieldMappings": [
              {
                "columnName": "FileHashValue",
                "identifier": "Value"
              },
              {
                "columnName": "FileHashType",
                "identifier": "Algorithm"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "DeviceName",
                "identifier": "HostName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/FileHashEntity_DeviceFileEvents.yaml",
        "query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nlet DeviceFileEvents_ = (union\n(DeviceFileEvents | where TimeGenerated > ago(dt_lookBack) | where isnotempty(SHA1) | extend FileHashValue = SHA1),\n(DeviceFileEvents | where TimeGenerated > ago(dt_lookBack) | where isnotempty(SHA256) | extend FileHashValue = SHA256));\nlet Hashes = DeviceFileEvents_ | distinct FileHashValue;\nThreatIntelligenceIndicator\n| where isnotempty(FileHashValue)\n| where TimeGenerated > ago(ioc_lookBack)\n| where FileHashValue in (Hashes)\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n| where Active == true and ExpirationDateTime > now()\n| where Description !contains_cs \"State: inactive;\" and Description !contains_cs \"State: falsepos;\"\n| join kind=innerunique (DeviceFileEvents_) on $left.FileHashValue == $right.FileHashValue\n| where TimeGenerated < ExpirationDateTime\n| summarize TimeGenerated = arg_max(TimeGenerated, *) by  IndicatorId, DeviceId\n| project TimeGenerated, TrafficLightProtocolLevel, Description, ActivityGroupNames, IndicatorId, ThreatType, FileHashValue, FileHashType, ExpirationDateTime, ConfidenceScore, ActionType, DeviceId, DeviceName, FolderPath, RequestAccountDomain, RequestAccountName, RequestAccountSid, MachineGroup\n| extend timestamp = TimeGenerated\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl"
        ],
        "techniques": [
          "T1071"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}