ThreatConnect TI map Email entity to SigninLogs

let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let emailregex = @'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$';
let aadFunc = (tableName:string){
ThreatIntelligenceIndicator
  | where TimeGenerated >= ago(ioc_lookBack)
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
  | where ExpirationDateTime > now() and Active == true
// Filter out non ThreatConnect TI Sources
| where SourceSystem startswith "ThreatConnect-"
//Filtering the table for Email related IOCs
| where isnotempty(EmailSenderAddress)
// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
| join kind=innerunique (
    table(tableName) | where TimeGenerated >= ago(dt_lookBack) and isnotempty(UserPrincipalName)
    //Normalizing the column to lower case for exact match with EmailSenderAddress column
    | extend UserPrincipalName = tolower(UserPrincipalName)
    | where UserPrincipalName matches regex emailregex
    | extend Status = todynamic(DeviceDetail), LocationDetails = todynamic(LocationDetails)
    | extend StatusCode = tostring(Status.errorCode), StatusDetails = tostring(Status.additionalDetails)
    | extend State = tostring(LocationDetails.state), City = tostring(LocationDetails.city), Region = tostring(LocationDetails.countryOrRegion)
    // renaming timestamp column so it is clear the log this came from SigninLogs table
    | extend SigninLogs_TimeGenerated = TimeGenerated, Type = Type
)
on $left.EmailSenderAddress == $right.UserPrincipalName
| where SigninLogs_TimeGenerated < ExpirationDateTime
| summarize SigninLogs_TimeGenerated = arg_max(SigninLogs_TimeGenerated, *) by IndicatorId, UserPrincipalName
| project SigninLogs_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore,
EmailSenderName, EmailRecipient, EmailSourceDomain, EmailSourceIpAddress, EmailSubject, FileHashValue, FileHashType, IPAddress, UserPrincipalName, AppDisplayName,
StatusCode, StatusDetails, NetworkIP, NetworkDestinationIP, NetworkSourceIP, Type
| extend Name = tostring(split(UserPrincipalName, '@', 0)[0]), UPNSuffix = tostring(split(UserPrincipalName, '@', 1)[0])
| extend timestamp = SigninLogs_TimeGenerated
};
let aadSignin = aadFunc("SigninLogs");
let aadNonInt = aadFunc("AADNonInteractiveUserSignInLogs");
union isfuzzy=true aadSignin, aadNonInt

description: |
    'Identifies a match in SigninLogs table from any Email IOC from ThreatConnect TI'
requiredDataConnectors:
- connectorId: ThreatIntelligence
  dataTypes:
  - ThreatIntelligenceIndicator
- connectorId: ThreatIntelligenceTaxii
  dataTypes:
  - ThreatIntelligenceIndicator
- connectorId: AzureActiveDirectory
  dataTypes:
  - SigninLogs
- connectorId: AzureActiveDirectory
  dataTypes:
  - AADNonInteractiveUserSignInLogs
- connectorId: MicrosoftDefenderThreatIntelligence
  dataTypes:
  - ThreatIntelligenceIndicator
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: Name
    identifier: Name
  - columnName: UPNSuffix
    identifier: UPNSuffix
- entityType: IP
  fieldMappings:
  - columnName: IPAddress
    identifier: Address
- entityType: URL
  fieldMappings:
  - columnName: Url
    identifier: Url
severity: Medium
relevantTechniques:
- T1071
kind: Scheduled
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
  let emailregex = @'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$';
  let aadFunc = (tableName:string){
  ThreatIntelligenceIndicator
    | where TimeGenerated >= ago(ioc_lookBack)
    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
    | where ExpirationDateTime > now() and Active == true
  // Filter out non ThreatConnect TI Sources
  | where SourceSystem startswith "ThreatConnect-"
  //Filtering the table for Email related IOCs
  | where isnotempty(EmailSenderAddress)
  // using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
  | join kind=innerunique (
      table(tableName) | where TimeGenerated >= ago(dt_lookBack) and isnotempty(UserPrincipalName)
      //Normalizing the column to lower case for exact match with EmailSenderAddress column
      | extend UserPrincipalName = tolower(UserPrincipalName)
      | where UserPrincipalName matches regex emailregex
      | extend Status = todynamic(DeviceDetail), LocationDetails = todynamic(LocationDetails)
      | extend StatusCode = tostring(Status.errorCode), StatusDetails = tostring(Status.additionalDetails)
      | extend State = tostring(LocationDetails.state), City = tostring(LocationDetails.city), Region = tostring(LocationDetails.countryOrRegion)
      // renaming timestamp column so it is clear the log this came from SigninLogs table
      | extend SigninLogs_TimeGenerated = TimeGenerated, Type = Type
  )
  on $left.EmailSenderAddress == $right.UserPrincipalName
  | where SigninLogs_TimeGenerated < ExpirationDateTime
  | summarize SigninLogs_TimeGenerated = arg_max(SigninLogs_TimeGenerated, *) by IndicatorId, UserPrincipalName
  | project SigninLogs_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore,
  EmailSenderName, EmailRecipient, EmailSourceDomain, EmailSourceIpAddress, EmailSubject, FileHashValue, FileHashType, IPAddress, UserPrincipalName, AppDisplayName,
  StatusCode, StatusDetails, NetworkIP, NetworkDestinationIP, NetworkSourceIP, Type
  | extend Name = tostring(split(UserPrincipalName, '@', 0)[0]), UPNSuffix = tostring(split(UserPrincipalName, '@', 1)[0])
  | extend timestamp = SigninLogs_TimeGenerated
  };
  let aadSignin = aadFunc("SigninLogs");
  let aadNonInt = aadFunc("AADNonInteractiveUserSignInLogs");
  union isfuzzy=true aadSignin, aadNonInt  
tactics:
- CommandAndControl
queryFrequency: 1h
id: ecb68ce7-c309-59a7-a8de-07ccf2a0ea4f
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ThreatConnect/Analytic Rules/ThreatConnect_EmailEntity_SigninLogs.yaml
name: ThreatConnect TI map Email entity to SigninLogs
triggerThreshold: 0
version: 1.2.5
triggerOperator: gt
queryPeriod: 14d

{
  "$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/ecb68ce7-c309-59a7-a8de-07ccf2a0ea4f')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/ecb68ce7-c309-59a7-a8de-07ccf2a0ea4f')]",
      "properties": {
        "alertRuleTemplateName": "ecb68ce7-c309-59a7-a8de-07ccf2a0ea4f",
        "customDetails": null,
        "description": "'Identifies a match in SigninLogs table from any Email IOC from ThreatConnect TI'\n",
        "displayName": "ThreatConnect TI map Email entity to SigninLogs",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "Name",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPAddress",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "Url",
                "identifier": "Url"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ThreatConnect/Analytic Rules/ThreatConnect_EmailEntity_SigninLogs.yaml",
        "query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nlet emailregex = @'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\\.[a-zA-Z0-9-.]+$';\nlet aadFunc = (tableName:string){\nThreatIntelligenceIndicator\n  | where TimeGenerated >= ago(ioc_lookBack)\n  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n  | where ExpirationDateTime > now() and Active == true\n// Filter out non ThreatConnect TI Sources\n| where SourceSystem startswith \"ThreatConnect-\"\n//Filtering the table for Email related IOCs\n| where isnotempty(EmailSenderAddress)\n// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated\n| join kind=innerunique (\n    table(tableName) | where TimeGenerated >= ago(dt_lookBack) and isnotempty(UserPrincipalName)\n    //Normalizing the column to lower case for exact match with EmailSenderAddress column\n    | extend UserPrincipalName = tolower(UserPrincipalName)\n    | where UserPrincipalName matches regex emailregex\n    | extend Status = todynamic(DeviceDetail), LocationDetails = todynamic(LocationDetails)\n    | extend StatusCode = tostring(Status.errorCode), StatusDetails = tostring(Status.additionalDetails)\n    | extend State = tostring(LocationDetails.state), City = tostring(LocationDetails.city), Region = tostring(LocationDetails.countryOrRegion)\n    // renaming timestamp column so it is clear the log this came from SigninLogs table\n    | extend SigninLogs_TimeGenerated = TimeGenerated, Type = Type\n)\non $left.EmailSenderAddress == $right.UserPrincipalName\n| where SigninLogs_TimeGenerated < ExpirationDateTime\n| summarize SigninLogs_TimeGenerated = arg_max(SigninLogs_TimeGenerated, *) by IndicatorId, UserPrincipalName\n| project SigninLogs_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore,\nEmailSenderName, EmailRecipient, EmailSourceDomain, EmailSourceIpAddress, EmailSubject, FileHashValue, FileHashType, IPAddress, UserPrincipalName, AppDisplayName,\nStatusCode, StatusDetails, NetworkIP, NetworkDestinationIP, NetworkSourceIP, Type\n| extend Name = tostring(split(UserPrincipalName, '@', 0)[0]), UPNSuffix = tostring(split(UserPrincipalName, '@', 1)[0])\n| extend timestamp = SigninLogs_TimeGenerated\n};\nlet aadSignin = aadFunc(\"SigninLogs\");\nlet aadNonInt = aadFunc(\"AADNonInteractiveUserSignInLogs\");\nunion isfuzzy=true aadSignin, aadNonInt\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl"
        ],
        "techniques": [
          "T1071"
        ],
        "templateVersion": "1.2.5",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}