Detection of Specific Hashes in CommonSecurityLog

// Identifies a match in CommonSecurityLog from the Recorded Future Hashes Observed in Underground Virus Testing Sites
let dt_lookBack = 1h;
let ioc_lookBack = 1d;
let fileHashIndicators = ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()
// Picking up only Recorded Future IOC's that have been observed in undersground testing sites
| where Description == "Recorded Future - HASH - Observed in Underground Virus Testing Sites"
| where Active == true
| where isnotempty(FileHashValue);
// Handle matches against both lower case and uppercase versions of the hash:
(fileHashIndicators | extend  FileHashValue = tolower(FileHashValue)
| union (fileHashIndicators | extend FileHashValue = toupper(FileHashValue)))
| join (
  CommonSecurityLog | where TimeGenerated >= ago(dt_lookBack)
  | where isnotempty(FileHash)
  | extend CommonSecurityLog_TimeGenerated = TimeGenerated
  )
on $left.FileHashValue == $right.FileHash
| where CommonSecurityLog_TimeGenerated >= TimeGenerated and CommonSecurityLog_TimeGenerated < ExpirationDateTime
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| project LatestIndicatorTime, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore,
CommonSecurityLog_TimeGenerated, SourceIP, SourcePort, DestinationIP, DestinationPort, SourceUserID, SourceUserName, DeviceName, DeviceAction, RequestURL, DestinationUserName, DestinationUserID, ApplicationProtocol, Activity, FileHash, AdditionalInformation
| extend timestamp = CommonSecurityLog_TimeGenerated, IPCustomEntity = SourceIP, HostCustomEntity = DeviceName, AccountCustomEntity = SourceUserName, URLCustomEntity = Url

triggerOperator: gt
queryFrequency: 1h
description: |
    'Identifies a match in CommonSecurityLog from Recorded Future Hash Observed in Underground Virus Testing Sites RiskList.'
status: Available
kind: Scheduled
triggerThreshold: 0
requiredDataConnectors:
- connectorId: CEF
  dataTypes:
  - CommonSecurityLog
version: 1.0.0
queryPeriod: 1d
name: Detection of Specific Hashes in CommonSecurityLog
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Recorded Future/Analytic Rules/RecordedFutureHashObservedInUndergroundinCommonSecurityLog.yaml
id: 388e197d-ec9e-46b6-addb-947d74d2a5c4
tactics:
- PreAttack
relevantTechniques:
- T1587.001
severity: Medium
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: AccountCustomEntity
  entityType: Account
- fieldMappings:
  - identifier: FullName
    columnName: HostCustomEntity
  entityType: Host
- fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
  entityType: IP
- fieldMappings:
  - identifier: Url
    columnName: URLCustomEntity
  entityType: URL
query: |
  // Identifies a match in CommonSecurityLog from the Recorded Future Hashes Observed in Underground Virus Testing Sites
  let dt_lookBack = 1h;
  let ioc_lookBack = 1d;
  let fileHashIndicators = ThreatIntelligenceIndicator
  | where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()
  // Picking up only Recorded Future IOC's that have been observed in undersground testing sites
  | where Description == "Recorded Future - HASH - Observed in Underground Virus Testing Sites"
  | where Active == true
  | where isnotempty(FileHashValue);
  // Handle matches against both lower case and uppercase versions of the hash:
  (fileHashIndicators | extend  FileHashValue = tolower(FileHashValue)
  | union (fileHashIndicators | extend FileHashValue = toupper(FileHashValue)))
  | join (
    CommonSecurityLog | where TimeGenerated >= ago(dt_lookBack)
    | where isnotempty(FileHash)
    | extend CommonSecurityLog_TimeGenerated = TimeGenerated
    )
  on $left.FileHashValue == $right.FileHash
  | where CommonSecurityLog_TimeGenerated >= TimeGenerated and CommonSecurityLog_TimeGenerated < ExpirationDateTime
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
  | project LatestIndicatorTime, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore,
  CommonSecurityLog_TimeGenerated, SourceIP, SourcePort, DestinationIP, DestinationPort, SourceUserID, SourceUserName, DeviceName, DeviceAction, RequestURL, DestinationUserName, DestinationUserID, ApplicationProtocol, Activity, FileHash, AdditionalInformation
  | extend timestamp = CommonSecurityLog_TimeGenerated, IPCustomEntity = SourceIP, HostCustomEntity = DeviceName, AccountCustomEntity = SourceUserName, URLCustomEntity = Url  

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/388e197d-ec9e-46b6-addb-947d74d2a5c4')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/388e197d-ec9e-46b6-addb-947d74d2a5c4')]",
      "properties": {
        "alertRuleTemplateName": "388e197d-ec9e-46b6-addb-947d74d2a5c4",
        "customDetails": null,
        "description": "'Identifies a match in CommonSecurityLog from Recorded Future Hash Observed in Underground Virus Testing Sites RiskList.'\n",
        "displayName": "Detection of Specific Hashes in CommonSecurityLog",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "HostCustomEntity",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "URLCustomEntity",
                "identifier": "Url"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Recorded Future/Analytic Rules/RecordedFutureHashObservedInUndergroundinCommonSecurityLog.yaml",
        "query": "// Identifies a match in CommonSecurityLog from the Recorded Future Hashes Observed in Underground Virus Testing Sites\nlet dt_lookBack = 1h;\nlet ioc_lookBack = 1d;\nlet fileHashIndicators = ThreatIntelligenceIndicator\n| where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()\n// Picking up only Recorded Future IOC's that have been observed in undersground testing sites\n| where Description == \"Recorded Future - HASH - Observed in Underground Virus Testing Sites\"\n| where Active == true\n| where isnotempty(FileHashValue);\n// Handle matches against both lower case and uppercase versions of the hash:\n(fileHashIndicators | extend  FileHashValue = tolower(FileHashValue)\n| union (fileHashIndicators | extend FileHashValue = toupper(FileHashValue)))\n| join (\n  CommonSecurityLog | where TimeGenerated >= ago(dt_lookBack)\n  | where isnotempty(FileHash)\n  | extend CommonSecurityLog_TimeGenerated = TimeGenerated\n  )\non $left.FileHashValue == $right.FileHash\n| where CommonSecurityLog_TimeGenerated >= TimeGenerated and CommonSecurityLog_TimeGenerated < ExpirationDateTime\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n| project LatestIndicatorTime, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore,\nCommonSecurityLog_TimeGenerated, SourceIP, SourcePort, DestinationIP, DestinationPort, SourceUserID, SourceUserName, DeviceName, DeviceAction, RequestURL, DestinationUserName, DestinationUserID, ApplicationProtocol, Activity, FileHash, AdditionalInformation\n| extend timestamp = CommonSecurityLog_TimeGenerated, IPCustomEntity = SourceIP, HostCustomEntity = DeviceName, AccountCustomEntity = SourceUserName, URLCustomEntity = Url\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P1D",
        "severity": "Medium",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "PreAttack"
        ],
        "techniques": [
          "T1587"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}