Microsoft Sentinel Analytic Rules
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Guest accounts added in AAD Groups other than the ones specified

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Id6ab1f7b2-61b8-442f-bc81-96afe7ad8c53
RulenameGuest accounts added in AAD Groups other than the ones specified
DescriptionGuest Accounts are added in the Organization Tenants to perform various tasks i.e projects execution, support etc.. This detection notifies when guest users are added to Azure AD Groups other than the ones specified and poses a risk to gain access to sensitive apps or data.
SeverityHigh
TacticsInitialAccess
Persistence
Discovery
TechniquesT1078.004
T1136.003
T1087.004
Required data connectorsAzureActiveDirectory
KindScheduled
Query frequency1d
Query period1d
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Active Directory/Analytic Rules/GuestAccountsAddedinAADGroupsOtherThanTheOnesSpecified.yaml
Version1.0.2
Arm template6ab1f7b2-61b8-442f-bc81-96afe7ad8c53.json
Deploy To Azure
// OBJECT ID of AAD Groups can be found by navigating to Azure Active Directory then from menu on the left, select Groups and from the list shown of AAD Groups, the Second Column shows the ObjectID of each
let GroupIDs = dynamic(["List with Custom AAD GROUP OBJECT ID 1","Custom AAD GROUP OBJECT ID 2"]);
AuditLogs
| where OperationName in ('Add member to group', 'Add owner to group')
| extend InitiatedByActionUserInformation = iff(isnotempty(InitiatedBy.user.userPrincipalName), InitiatedBy.user.userPrincipalName, InitiatedBy.app.displayName)
| extend InitiatedByIPAdress = InitiatedBy.user.ipAddress 
// Uncomment the following line to filter events where the inviting user was a guest user
//| where InitiatedBy has_any ("CUSTOM DOMAIN NAME#", "#EXT#")
| mv-apply TargetResource = TargetResources on 
  (
      where TargetResource.type =~ "User"
      | extend InvitedUser = trim(@'"',tostring(TargetResource.userPrincipalName)),
               Properties = TargetResource.modifiedProperties
  )
| mv-apply Property = Properties on 
  (
      where Property.displayName =~ "Group.DisplayName"
      | extend AADGroup = trim('"',tostring(Property.newValue))
  )
| where InvitedUser has_any ("CUSTOM DOMAIN NAME#", "#EXT#")
| mv-apply Property = Properties on
   (
     where Property.displayName =~ "Group.ObjectID"
     | extend AADGroupId = trim('"',tostring(Property.newValue))
   )
| where AADGroupId !in (GroupIDs)
| extend Name = tostring(split(InitiatedByActionUserInformation,'@',0)[0]), UPNSuffix = tostring(split(InitiatedByActionUserInformation,'@',1)[0])
severity: High
queryFrequency: 1d
relevantTechniques:
- T1078.004
- T1136.003
- T1087.004
tactics:
- InitialAccess
- Persistence
- Discovery
kind: Scheduled
query: |
  // OBJECT ID of AAD Groups can be found by navigating to Azure Active Directory then from menu on the left, select Groups and from the list shown of AAD Groups, the Second Column shows the ObjectID of each
  let GroupIDs = dynamic(["List with Custom AAD GROUP OBJECT ID 1","Custom AAD GROUP OBJECT ID 2"]);
  AuditLogs
  | where OperationName in ('Add member to group', 'Add owner to group')
  | extend InitiatedByActionUserInformation = iff(isnotempty(InitiatedBy.user.userPrincipalName), InitiatedBy.user.userPrincipalName, InitiatedBy.app.displayName)
  | extend InitiatedByIPAdress = InitiatedBy.user.ipAddress 
  // Uncomment the following line to filter events where the inviting user was a guest user
  //| where InitiatedBy has_any ("CUSTOM DOMAIN NAME#", "#EXT#")
  | mv-apply TargetResource = TargetResources on 
    (
        where TargetResource.type =~ "User"
        | extend InvitedUser = trim(@'"',tostring(TargetResource.userPrincipalName)),
                 Properties = TargetResource.modifiedProperties
    )
  | mv-apply Property = Properties on 
    (
        where Property.displayName =~ "Group.DisplayName"
        | extend AADGroup = trim('"',tostring(Property.newValue))
    )
  | where InvitedUser has_any ("CUSTOM DOMAIN NAME#", "#EXT#")
  | mv-apply Property = Properties on
     (
       where Property.displayName =~ "Group.ObjectID"
       | extend AADGroupId = trim('"',tostring(Property.newValue))
     )
  | where AADGroupId !in (GroupIDs)
  | extend Name = tostring(split(InitiatedByActionUserInformation,'@',0)[0]), UPNSuffix = tostring(split(InitiatedByActionUserInformation,'@',1)[0])  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Active Directory/Analytic Rules/GuestAccountsAddedinAADGroupsOtherThanTheOnesSpecified.yaml
queryPeriod: 1d
status: Available
version: 1.0.2
name: Guest accounts added in AAD Groups other than the ones specified
requiredDataConnectors:
- dataTypes:
  - AuditLogs
  connectorId: AzureActiveDirectory
triggerOperator: gt
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: InvitedUser
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: Name
  - identifier: UPNSuffix
    columnName: UPNSuffix
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: InitiatedByIPAdress
id: 6ab1f7b2-61b8-442f-bc81-96afe7ad8c53
description: |
    'Guest Accounts are added in the Organization Tenants to perform various tasks i.e projects execution, support etc.. This detection notifies when guest users are added to Azure AD Groups other than the ones specified and poses a risk to gain access to sensitive apps or data.'
triggerThreshold: 0
{
  "$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/6ab1f7b2-61b8-442f-bc81-96afe7ad8c53')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/6ab1f7b2-61b8-442f-bc81-96afe7ad8c53')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "Guest accounts added in AAD Groups other than the ones specified",
        "description": "'Guest Accounts are added in the Organization Tenants to perform various tasks i.e projects execution, support etc.. This detection notifies when guest users are added to Azure AD Groups other than the ones specified and poses a risk to gain access to sensitive apps or data.'\n",
        "severity": "High",
        "enabled": true,
        "query": "// OBJECT ID of AAD Groups can be found by navigating to Azure Active Directory then from menu on the left, select Groups and from the list shown of AAD Groups, the Second Column shows the ObjectID of each\nlet GroupIDs = dynamic([\"List with Custom AAD GROUP OBJECT ID 1\",\"Custom AAD GROUP OBJECT ID 2\"]);\nAuditLogs\n| where OperationName in ('Add member to group', 'Add owner to group')\n| extend InitiatedByActionUserInformation = iff(isnotempty(InitiatedBy.user.userPrincipalName), InitiatedBy.user.userPrincipalName, InitiatedBy.app.displayName)\n| extend InitiatedByIPAdress = InitiatedBy.user.ipAddress \n// Uncomment the following line to filter events where the inviting user was a guest user\n//| where InitiatedBy has_any (\"CUSTOM DOMAIN NAME#\", \"#EXT#\")\n| mv-apply TargetResource = TargetResources on \n  (\n      where TargetResource.type =~ \"User\"\n      | extend InvitedUser = trim(@'\"',tostring(TargetResource.userPrincipalName)),\n               Properties = TargetResource.modifiedProperties\n  )\n| mv-apply Property = Properties on \n  (\n      where Property.displayName =~ \"Group.DisplayName\"\n      | extend AADGroup = trim('\"',tostring(Property.newValue))\n  )\n| where InvitedUser has_any (\"CUSTOM DOMAIN NAME#\", \"#EXT#\")\n| mv-apply Property = Properties on\n   (\n     where Property.displayName =~ \"Group.ObjectID\"\n     | extend AADGroupId = trim('\"',tostring(Property.newValue))\n   )\n| where AADGroupId !in (GroupIDs)\n| extend Name = tostring(split(InitiatedByActionUserInformation,'@',0)[0]), UPNSuffix = tostring(split(InitiatedByActionUserInformation,'@',1)[0])\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess",
          "Persistence",
          "Discovery"
        ],
        "techniques": [
          "T1078.004",
          "T1136.003",
          "T1087.004"
        ],
        "alertRuleTemplateName": "6ab1f7b2-61b8-442f-bc81-96afe7ad8c53",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "columnName": "InvitedUser",
                "identifier": "Name"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "columnName": "Name",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "columnName": "InitiatedByIPAdress",
                "identifier": "Address"
              }
            ],
            "entityType": "IP"
          }
        ],
        "templateVersion": "1.0.2",
        "status": "Available",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Active Directory/Analytic Rules/GuestAccountsAddedinAADGroupsOtherThanTheOnesSpecified.yaml"
      }
    }
  ]
}