Account created from non-approved sources

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Id	99d589fa-7337-40d7-91a0-c96d0c4fa437
Rulename	Account created from non-approved sources
Description	This query looks for account being created from a domain that is not regularly seen in a tenant. Attackers may attempt to add accounts from these sources as a means of establishing persistant access to an environment. Created accounts should be investigated to ensure they were legitimated created. Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-user-accounts#short-lived-accounts
Severity	Medium
Tactics	Persistence
Techniques	T1136.003
Required data connectors	AzureActiveDirectory
Kind	Scheduled
Query frequency	1d
Query period	7d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/Accountcreatedfromnon-approvedsources.yaml
Version	1.0.1
Arm template	99d589fa-7337-40d7-91a0-c96d0c4fa437.json

KQL

let core_domains = (SigninLogs
  | where TimeGenerated > ago(7d)
  | where ResultType == 0
  | extend domain = tolower(split(UserPrincipalName, "@")[1])
  | summarize by tostring(domain));
  let alternative_domains = (SigninLogs
  | where TimeGenerated > ago(7d)
  | where isnotempty(AlternateSignInName)
  | where ResultType == 0
  | extend domain = tolower(split(AlternateSignInName, "@")[1])
  | summarize by tostring(domain));
  AuditLogs
  | where TimeGenerated > ago(1d)
  | where OperationName =~ "Add User"
  | extend AddingUser = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)
  | extend AddingSPN = tostring(parse_json(tostring(InitiatedBy.app)).servicePrincipalName)
  | extend AddedBy = iif(isnotempty(AddingUser), AddingUser, AddingSPN)
  | extend UserAdded = tostring(TargetResources[0].userPrincipalName)
  | extend Domain = tolower(split(UserAdded, "@")[1])
  | where Domain !in (core_domains) and Domain !in (alternative_domains)
  | project-away AddingUser
  | project-reorder TimeGenerated, UserAdded, Domain, AddedBy

YAML

id: 99d589fa-7337-40d7-91a0-c96d0c4fa437
queryFrequency: 1d
version: 1.0.1
requiredDataConnectors:
- connectorId: AzureActiveDirectory
  dataTypes:
  - SigninLogs
  - AuditLogs
entityMappings:
- fieldMappings:
  - columnName: AddedBy
    identifier: FullName
  entityType: Account
- fieldMappings:
  - columnName: UserAdded
    identifier: FullName
  entityType: Account
kind: Scheduled
queryPeriod: 7d
severity: Medium
query: |
  let core_domains = (SigninLogs
    | where TimeGenerated > ago(7d)
    | where ResultType == 0
    | extend domain = tolower(split(UserPrincipalName, "@")[1])
    | summarize by tostring(domain));
    let alternative_domains = (SigninLogs
    | where TimeGenerated > ago(7d)
    | where isnotempty(AlternateSignInName)
    | where ResultType == 0
    | extend domain = tolower(split(AlternateSignInName, "@")[1])
    | summarize by tostring(domain));
    AuditLogs
    | where TimeGenerated > ago(1d)
    | where OperationName =~ "Add User"
    | extend AddingUser = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)
    | extend AddingSPN = tostring(parse_json(tostring(InitiatedBy.app)).servicePrincipalName)
    | extend AddedBy = iif(isnotempty(AddingUser), AddingUser, AddingSPN)
    | extend UserAdded = tostring(TargetResources[0].userPrincipalName)
    | extend Domain = tolower(split(UserAdded, "@")[1])
    | where Domain !in (core_domains) and Domain !in (alternative_domains)
    | project-away AddingUser
    | project-reorder TimeGenerated, UserAdded, Domain, AddedBy  
metadata:
  categories:
    domains:
    - Security - Others
    - Identity
  author:
    name: Pete Bryan
  support:
    tier: Community
  source:
    kind: Community
triggerOperator: gt
tags:
- AADSecOpsGuide
description: |
  'This query looks for account being created from a domain that is not regularly seen in a tenant.
    Attackers may attempt to add accounts from these sources as a means of establishing persistant access to an environment.
    Created accounts should be investigated to ensure they were legitimated created.
    Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-user-accounts#short-lived-accounts'  
triggerThreshold: 0
name: Account created from non-approved sources
relevantTechniques:
- T1136.003
tactics:
- Persistence
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/Accountcreatedfromnon-approvedsources.yaml

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/99d589fa-7337-40d7-91a0-c96d0c4fa437')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/99d589fa-7337-40d7-91a0-c96d0c4fa437')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Account created from non-approved sources",
        "description": "'This query looks for account being created from a domain that is not regularly seen in a tenant.\n  Attackers may attempt to add accounts from these sources as a means of establishing persistant access to an environment.\n  Created accounts should be investigated to ensure they were legitimated created.\n  Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-user-accounts#short-lived-accounts'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let core_domains = (SigninLogs\n  | where TimeGenerated > ago(7d)\n  | where ResultType == 0\n  | extend domain = tolower(split(UserPrincipalName, \"@\")[1])\n  | summarize by tostring(domain));\n  let alternative_domains = (SigninLogs\n  | where TimeGenerated > ago(7d)\n  | where isnotempty(AlternateSignInName)\n  | where ResultType == 0\n  | extend domain = tolower(split(AlternateSignInName, \"@\")[1])\n  | summarize by tostring(domain));\n  AuditLogs\n  | where TimeGenerated > ago(1d)\n  | where OperationName =~ \"Add User\"\n  | extend AddingUser = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)\n  | extend AddingSPN = tostring(parse_json(tostring(InitiatedBy.app)).servicePrincipalName)\n  | extend AddedBy = iif(isnotempty(AddingUser), AddingUser, AddingSPN)\n  | extend UserAdded = tostring(TargetResources[0].userPrincipalName)\n  | extend Domain = tolower(split(UserAdded, \"@\")[1])\n  | where Domain !in (core_domains) and Domain !in (alternative_domains)\n  | project-away AddingUser\n  | project-reorder TimeGenerated, UserAdded, Domain, AddedBy\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P7D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Persistence"
        ],
        "techniques": [
          "T1136.003"
        ],
        "alertRuleTemplateName": "99d589fa-7337-40d7-91a0-c96d0c4fa437",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "AddedBy"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "UserAdded"
              }
            ]
          }
        ],
        "tags": [
          "AADSecOpsGuide"
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/Accountcreatedfromnon-approvedsources.yaml",
        "templateVersion": "1.0.1"
      }
    }
  ]
}