Service Principal Assigned Privileged Role

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Id	84cccc86-5c11-4b3a-aca6-7c8f738ed0f7
Rulename	Service Principal Assigned Privileged Role
Description	Detects a privileged role being added to a Service Principal. Ensure that any assignment to a Service Principal is valid and appropriate - Service Principals should not be assigned to very highly privileged roles such as Global Admin. Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-privileged-accounts#changes-to-privileged-accounts
Severity	Medium
Tactics	PrivilegeEscalation
Techniques	T1078.004
Required data connectors	AzureActiveDirectory
Kind	Scheduled
Query frequency	1d
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Detections/AuditLogs/ServicePrincipalAssignedPrivilegedRole.yaml
Version	1.0.1
Arm template	84cccc86-5c11-4b3a-aca6-7c8f738ed0f7.json

KQL

AuditLogs
  | where OperationName has_all ("member to role", "add")
  | where Result =~ "Success"
  | extend type_ = tostring(TargetResources[0].type)
  | where type_ =~ "ServicePrincipal"
  | where isnotempty(TargetResources)
  | extend ServicePrincipal = tostring(TargetResources[0].displayName)
  | extend SPID = tostring(TargetResources[0].id)
  | mv-expand TargetResources[0].modifiedProperties
  | extend TargetResources_0_modifiedProperties = columnifexists("TargetResources_0_modifiedProperties", '')
  | where isnotempty(TargetResources_0_modifiedProperties)
  | where TargetResources_0_modifiedProperties.displayName =~ "Role.DisplayName"
  | extend TargetRole = parse_json(tostring(TargetResources_0_modifiedProperties.newValue))
  | where TargetRole contains "admin"
  | extend AddedByApp = iif(
  isnotempty(tostring(parse_json(tostring(InitiatedBy.app)).servicePrincipalName)),
  tostring(parse_json(tostring(InitiatedBy.app)).servicePrincipalName),
  tostring(parse_json(tostring(InitiatedBy.app)).displayName)
  )
  | extend AddedByUser = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)
  | extend AddedBy = iif(isnotempty(AddedByApp), AddedByApp, AddedByUser)
  | extend IpAddress = tostring(parse_json(tostring(InitiatedBy.user)).ipAddress)
  | project-reorder TimeGenerated, ServicePrincipal, SPID, TargetRole, AddedBy, IpAddress
  | project-away AddedByApp, AddedByUser

YAML

queryFrequency: 1d
metadata:
  author:
    name: Pete Bryan
  source:
    kind: Community
  categories:
    domains:
    - Security - Others
    - Identity
  support:
    tier: Community
triggerOperator: gt
tactics:
- PrivilegeEscalation
description: |
  'Detects a privileged role being added to a Service Principal.
    Ensure that any assignment to a Service Principal is valid and appropriate - Service Principals should not be assigned to very highly privileged roles such as Global Admin.
    Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-privileged-accounts#changes-to-privileged-accounts'  
relevantTechniques:
- T1078.004
name: Service Principal Assigned Privileged Role
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/AuditLogs/ServicePrincipalAssignedPrivilegedRole.yaml
severity: Medium
triggerThreshold: 0
version: 1.0.1
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: AadUserId
    columnName: SPID
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: AddedBy
tags:
- AADSecOpsGuide
id: 84cccc86-5c11-4b3a-aca6-7c8f738ed0f7
requiredDataConnectors:
- connectorId: AzureActiveDirectory
  dataTypes:
  - AuditLogs
kind: Scheduled
query: |
  AuditLogs
    | where OperationName has_all ("member to role", "add")
    | where Result =~ "Success"
    | extend type_ = tostring(TargetResources[0].type)
    | where type_ =~ "ServicePrincipal"
    | where isnotempty(TargetResources)
    | extend ServicePrincipal = tostring(TargetResources[0].displayName)
    | extend SPID = tostring(TargetResources[0].id)
    | mv-expand TargetResources[0].modifiedProperties
    | extend TargetResources_0_modifiedProperties = columnifexists("TargetResources_0_modifiedProperties", '')
    | where isnotempty(TargetResources_0_modifiedProperties)
    | where TargetResources_0_modifiedProperties.displayName =~ "Role.DisplayName"
    | extend TargetRole = parse_json(tostring(TargetResources_0_modifiedProperties.newValue))
    | where TargetRole contains "admin"
    | extend AddedByApp = iif(
    isnotempty(tostring(parse_json(tostring(InitiatedBy.app)).servicePrincipalName)),
    tostring(parse_json(tostring(InitiatedBy.app)).servicePrincipalName),
    tostring(parse_json(tostring(InitiatedBy.app)).displayName)
    )
    | extend AddedByUser = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)
    | extend AddedBy = iif(isnotempty(AddedByApp), AddedByApp, AddedByUser)
    | extend IpAddress = tostring(parse_json(tostring(InitiatedBy.user)).ipAddress)
    | project-reorder TimeGenerated, ServicePrincipal, SPID, TargetRole, AddedBy, IpAddress
    | project-away AddedByApp, AddedByUser  
queryPeriod: 1d

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/84cccc86-5c11-4b3a-aca6-7c8f738ed0f7')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/84cccc86-5c11-4b3a-aca6-7c8f738ed0f7')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Service Principal Assigned Privileged Role",
        "description": "'Detects a privileged role being added to a Service Principal.\n  Ensure that any assignment to a Service Principal is valid and appropriate - Service Principals should not be assigned to very highly privileged roles such as Global Admin.\n  Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-privileged-accounts#changes-to-privileged-accounts'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "AuditLogs\n  | where OperationName has_all (\"member to role\", \"add\")\n  | where Result =~ \"Success\"\n  | extend type_ = tostring(TargetResources[0].type)\n  | where type_ =~ \"ServicePrincipal\"\n  | where isnotempty(TargetResources)\n  | extend ServicePrincipal = tostring(TargetResources[0].displayName)\n  | extend SPID = tostring(TargetResources[0].id)\n  | mv-expand TargetResources[0].modifiedProperties\n  | extend TargetResources_0_modifiedProperties = columnifexists(\"TargetResources_0_modifiedProperties\", '')\n  | where isnotempty(TargetResources_0_modifiedProperties)\n  | where TargetResources_0_modifiedProperties.displayName =~ \"Role.DisplayName\"\n  | extend TargetRole = parse_json(tostring(TargetResources_0_modifiedProperties.newValue))\n  | where TargetRole contains \"admin\"\n  | extend AddedByApp = iif(\n  isnotempty(tostring(parse_json(tostring(InitiatedBy.app)).servicePrincipalName)),\n  tostring(parse_json(tostring(InitiatedBy.app)).servicePrincipalName),\n  tostring(parse_json(tostring(InitiatedBy.app)).displayName)\n  )\n  | extend AddedByUser = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)\n  | extend AddedBy = iif(isnotempty(AddedByApp), AddedByApp, AddedByUser)\n  | extend IpAddress = tostring(parse_json(tostring(InitiatedBy.user)).ipAddress)\n  | project-reorder TimeGenerated, ServicePrincipal, SPID, TargetRole, AddedBy, IpAddress\n  | project-away AddedByApp, AddedByUser\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1078.004"
        ],
        "alertRuleTemplateName": "84cccc86-5c11-4b3a-aca6-7c8f738ed0f7",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "identifier": "AadUserId",
                "columnName": "SPID"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "AddedBy"
              }
            ]
          }
        ],
        "templateVersion": "1.0.1",
        "tags": [
          "AADSecOpsGuide"
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/AuditLogs/ServicePrincipalAssignedPrivilegedRole.yaml"
      }
    }
  ]
}