Microsoft Sentinel Analytic Rules
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TI map Email entity to SigninLogs

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Id30fa312c-31eb-43d8-b0cc-bcbdfb360822
RulenameTI map Email entity to SigninLogs
DescriptionIdentifies a match in SigninLogs table from any Email IOC from TI
SeverityMedium
TacticsImpact
Required data connectorsAzureActiveDirectory
MicrosoftDefenderThreatIntelligence
ThreatIntelligence
ThreatIntelligenceTaxii
KindScheduled
Query frequency1h
Query period14d
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/EmailEntity_SigninLogs.yaml
Version1.2.5
Arm template30fa312c-31eb-43d8-b0cc-bcbdfb360822.json
Deploy To Azure
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let emailregex = @'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$';
let Signins = materialize(union isfuzzy=true
( SigninLogs | where TimeGenerated >= ago(dt_lookBack)),
( AADNonInteractiveUserSignInLogs | where TimeGenerated >= ago(dt_lookBack)
    | extend Status = todynamic(Status), LocationDetails = todynamic(LocationDetails))
| where isnotempty(UserPrincipalName) and UserPrincipalName matches regex emailregex
| extend UserPrincipalName = tolower(UserPrincipalName)
| extend Status = todynamic(Status), 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)
| extend SigninLogs_TimeGenerated = TimeGenerated);
let SigninUPNs = Signins | distinct UserPrincipalName | summarize make_list(UserPrincipalName);
ThreatIntelligenceIndicator
//Filtering the table for Email related IOCs
| where isnotempty(EmailSenderAddress)
| where TimeGenerated >= ago(ioc_lookBack)
| where EmailSenderAddress in (SigninUPNs)
| 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 (Signins) on $left.EmailSenderAddress == $right.UserPrincipalName
| where SigninLogs_TimeGenerated < ExpirationDateTime
| summarize SigninLogs_TimeGenerated = arg_max(SigninLogs_TimeGenerated, *) by IndicatorId, UserPrincipalName
| project SigninLogs_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore, EmailSenderName, EmailRecipient, EmailSourceDomain, EmailSourceIpAddress, EmailSubject, FileHashValue, FileHashType, IPAddress, UserPrincipalName, AppDisplayName, StatusCode, StatusDetails, NetworkIP, NetworkDestinationIP, NetworkSourceIP, Type
| extend Name = tostring(split(UserPrincipalName, '@', 0)[0]), UPNSuffix = tostring(split(UserPrincipalName, '@', 1)[0])
| extend timestamp = SigninLogs_TimeGenerated
name: TI map Email entity to SigninLogs
triggerOperator: gt
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
  let emailregex = @'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$';
  let Signins = materialize(union isfuzzy=true
  ( SigninLogs | where TimeGenerated >= ago(dt_lookBack)),
  ( AADNonInteractiveUserSignInLogs | where TimeGenerated >= ago(dt_lookBack)
      | extend Status = todynamic(Status), LocationDetails = todynamic(LocationDetails))
  | where isnotempty(UserPrincipalName) and UserPrincipalName matches regex emailregex
  | extend UserPrincipalName = tolower(UserPrincipalName)
  | extend Status = todynamic(Status), 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)
  | extend SigninLogs_TimeGenerated = TimeGenerated);
  let SigninUPNs = Signins | distinct UserPrincipalName | summarize make_list(UserPrincipalName);
  ThreatIntelligenceIndicator
  //Filtering the table for Email related IOCs
  | where isnotempty(EmailSenderAddress)
  | where TimeGenerated >= ago(ioc_lookBack)
  | where EmailSenderAddress in (SigninUPNs)
  | 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 (Signins) on $left.EmailSenderAddress == $right.UserPrincipalName
  | where SigninLogs_TimeGenerated < ExpirationDateTime
  | summarize SigninLogs_TimeGenerated = arg_max(SigninLogs_TimeGenerated, *) by IndicatorId, UserPrincipalName
  | project SigninLogs_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore, EmailSenderName, EmailRecipient, EmailSourceDomain, EmailSourceIpAddress, EmailSubject, FileHashValue, FileHashType, IPAddress, UserPrincipalName, AppDisplayName, StatusCode, StatusDetails, NetworkIP, NetworkDestinationIP, NetworkSourceIP, Type
  | extend Name = tostring(split(UserPrincipalName, '@', 0)[0]), UPNSuffix = tostring(split(UserPrincipalName, '@', 1)[0])
  | extend timestamp = SigninLogs_TimeGenerated  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/EmailEntity_SigninLogs.yaml
description: |
    'Identifies a match in SigninLogs table from any Email IOC from TI'
triggerThreshold: 0
id: 30fa312c-31eb-43d8-b0cc-bcbdfb360822
kind: Scheduled
severity: Medium
version: 1.2.5
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: Name
  - identifier: UPNSuffix
    columnName: UPNSuffix
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: IPAddress
  entityType: IP
- fieldMappings:
  - identifier: Url
    columnName: Url
  entityType: URL
queryFrequency: 1h
queryPeriod: 14d
requiredDataConnectors:
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligence
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligenceTaxii
- dataTypes:
  - SigninLogs
  connectorId: AzureActiveDirectory
- dataTypes:
  - AADNonInteractiveUserSignInLogs
  connectorId: AzureActiveDirectory
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: MicrosoftDefenderThreatIntelligence
tactics:
- Impact
{
  "$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/30fa312c-31eb-43d8-b0cc-bcbdfb360822')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/30fa312c-31eb-43d8-b0cc-bcbdfb360822')]",
      "properties": {
        "alertRuleTemplateName": "30fa312c-31eb-43d8-b0cc-bcbdfb360822",
        "customDetails": null,
        "description": "'Identifies a match in SigninLogs table from any Email IOC from TI'\n",
        "displayName": "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/Threat Intelligence/Analytic Rules/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 Signins = materialize(union isfuzzy=true\n( SigninLogs | where TimeGenerated >= ago(dt_lookBack)),\n( AADNonInteractiveUserSignInLogs | where TimeGenerated >= ago(dt_lookBack)\n    | extend Status = todynamic(Status), LocationDetails = todynamic(LocationDetails))\n| where isnotempty(UserPrincipalName) and UserPrincipalName matches regex emailregex\n| extend UserPrincipalName = tolower(UserPrincipalName)\n| extend Status = todynamic(Status), 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| extend SigninLogs_TimeGenerated = TimeGenerated);\nlet SigninUPNs = Signins | distinct UserPrincipalName | summarize make_list(UserPrincipalName);\nThreatIntelligenceIndicator\n//Filtering the table for Email related IOCs\n| where isnotempty(EmailSenderAddress)\n| where TimeGenerated >= ago(ioc_lookBack)\n| where EmailSenderAddress in (SigninUPNs)\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 (Signins) on $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, EmailSenderName, EmailRecipient, EmailSourceDomain, EmailSourceIpAddress, EmailSubject, FileHashValue, FileHashType, IPAddress, UserPrincipalName, AppDisplayName, StatusCode, 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",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "templateVersion": "1.2.5",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}