Threat Essentials - User Assigned Privileged Role

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Id	b09795c9-8dce-47ab-8f75-5a4afb78ef0c
Rulename	Threat Essentials - User Assigned Privileged Role
Description	Identifies when a new privileged role is assigned to a user. Any account eligible for a role is now being given privileged access. If the assignment is unexpected or into a role that isn’t the responsibility of the account holder, investigate. Ref : https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-privileged-accounts#things-to-monitor-1
Severity	High
Tactics	Persistence
Techniques	T1078.004
Required data connectors	AzureActiveDirectory
Kind	Scheduled
Query frequency	2h
Query period	2h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/SecurityThreatEssentialSolution/Analytic Rules/Threat_Essentials_UserAssignedPrivilegedRole.yaml
Version	1.0.3
Arm template	b09795c9-8dce-47ab-8f75-5a4afb78ef0c.json

KQL

AuditLogs
| where Category =~ "RoleManagement"
| where AADOperationType in~ ("Assign", "AssignEligibleRole")
| where ActivityDisplayName has_any ("Add eligible member to role", "Add member to role")
| mv-expand TargetResources
| mv-expand TargetResources.modifiedProperties
| extend displayName_ = tostring(TargetResources_modifiedProperties.displayName)
| where displayName_ =~ "Role.DisplayName"
| extend RoleName = tostring(parse_json(tostring(TargetResources_modifiedProperties.newValue)))
| where RoleName contains "Admin"
| extend InitiatingApp = tostring(parse_json(tostring(InitiatedBy.app)).displayName)
| extend Initiator = iif(isnotempty(InitiatingApp), InitiatingApp, tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName))
| extend Target = tostring(TargetResources.userPrincipalName)
| summarize by bin(TimeGenerated, 1h), OperationName,  RoleName, Target, Initiator, Result
| extend InitiatorName=split(Initiator, "@")[0], InitiatorUPNSuffix=split(Initiator, "@")[1]
| extend TargetName=split(Target, "@")[0], TargetUPNSuffix=split(Target, "@")[1]

YAML

relevantTechniques:
- T1078.004
name: Threat Essentials - User Assigned Privileged Role
requiredDataConnectors:
- dataTypes:
  - AuditLogs
  connectorId: AzureActiveDirectory
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: InitiatorName
  - identifier: UPNSuffix
    columnName: InitiatorUPNSuffix
  entityType: Account
- fieldMappings:
  - identifier: Name
    columnName: TargetName
  - identifier: UPNSuffix
    columnName: TargetUPNSuffix
  entityType: Account
triggerThreshold: 0
id: b09795c9-8dce-47ab-8f75-5a4afb78ef0c
tactics:
- Persistence
version: 1.0.3
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/SecurityThreatEssentialSolution/Analytic Rules/Threat_Essentials_UserAssignedPrivilegedRole.yaml
queryPeriod: 2h
kind: Scheduled
tags:
- AADSecOpsGuide
queryFrequency: 2h
severity: High
status: Available
description: |
  'Identifies when a new privileged role is assigned to a user.  Any account eligible for a role is now being given privileged access. If the assignment is unexpected or into a role that isn't the responsibility of the account holder, investigate.
  Ref : https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-privileged-accounts#things-to-monitor-1'  
query: |
  AuditLogs
  | where Category =~ "RoleManagement"
  | where AADOperationType in~ ("Assign", "AssignEligibleRole")
  | where ActivityDisplayName has_any ("Add eligible member to role", "Add member to role")
  | mv-expand TargetResources
  | mv-expand TargetResources.modifiedProperties
  | extend displayName_ = tostring(TargetResources_modifiedProperties.displayName)
  | where displayName_ =~ "Role.DisplayName"
  | extend RoleName = tostring(parse_json(tostring(TargetResources_modifiedProperties.newValue)))
  | where RoleName contains "Admin"
  | extend InitiatingApp = tostring(parse_json(tostring(InitiatedBy.app)).displayName)
  | extend Initiator = iif(isnotempty(InitiatingApp), InitiatingApp, tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName))
  | extend Target = tostring(TargetResources.userPrincipalName)
  | summarize by bin(TimeGenerated, 1h), OperationName,  RoleName, Target, Initiator, Result
  | extend InitiatorName=split(Initiator, "@")[0], InitiatorUPNSuffix=split(Initiator, "@")[1]
  | extend TargetName=split(Target, "@")[0], TargetUPNSuffix=split(Target, "@")[1]  
triggerOperator: gt

ARM

{
  "$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/b09795c9-8dce-47ab-8f75-5a4afb78ef0c')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/b09795c9-8dce-47ab-8f75-5a4afb78ef0c')]",
      "properties": {
        "alertRuleTemplateName": "b09795c9-8dce-47ab-8f75-5a4afb78ef0c",
        "customDetails": null,
        "description": "'Identifies when a new privileged role is assigned to a user.  Any account eligible for a role is now being given privileged access. If the assignment is unexpected or into a role that isn't the responsibility of the account holder, investigate.\nRef : https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-privileged-accounts#things-to-monitor-1'\n",
        "displayName": "Threat Essentials - User Assigned Privileged Role",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "InitiatorName",
                "identifier": "Name"
              },
              {
                "columnName": "InitiatorUPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "TargetName",
                "identifier": "Name"
              },
              {
                "columnName": "TargetUPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/SecurityThreatEssentialSolution/Analytic Rules/Threat_Essentials_UserAssignedPrivilegedRole.yaml",
        "query": "AuditLogs\n| where Category =~ \"RoleManagement\"\n| where AADOperationType in~ (\"Assign\", \"AssignEligibleRole\")\n| where ActivityDisplayName has_any (\"Add eligible member to role\", \"Add member to role\")\n| mv-expand TargetResources\n| mv-expand TargetResources.modifiedProperties\n| extend displayName_ = tostring(TargetResources_modifiedProperties.displayName)\n| where displayName_ =~ \"Role.DisplayName\"\n| extend RoleName = tostring(parse_json(tostring(TargetResources_modifiedProperties.newValue)))\n| where RoleName contains \"Admin\"\n| extend InitiatingApp = tostring(parse_json(tostring(InitiatedBy.app)).displayName)\n| extend Initiator = iif(isnotempty(InitiatingApp), InitiatingApp, tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName))\n| extend Target = tostring(TargetResources.userPrincipalName)\n| summarize by bin(TimeGenerated, 1h), OperationName,  RoleName, Target, Initiator, Result\n| extend InitiatorName=split(Initiator, \"@\")[0], InitiatorUPNSuffix=split(Initiator, \"@\")[1]\n| extend TargetName=split(Target, \"@\")[0], TargetUPNSuffix=split(Target, \"@\")[1]\n",
        "queryFrequency": "PT2H",
        "queryPeriod": "PT2H",
        "severity": "High",
        "status": "Available",
        "subTechniques": [
          "T1078.004"
        ],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Persistence"
        ],
        "tags": [
          "AADSecOpsGuide"
        ],
        "techniques": [
          "T1078"
        ],
        "templateVersion": "1.0.3",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}