Microsoft Sentinel Analytic Rules
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First access credential added to Application or Service Principal where no credential was present

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Id2cfc3c6e-f424-4b88-9cc9-c89f482d016a
RulenameFirst access credential added to Application or Service Principal where no credential was present
DescriptionThis will alert when an admin or app owner account adds a new credential to an Application or Service Principal where there was no previous verify KeyCredential associated.

If a threat actor obtains access to an account with sufficient privileges and adds the alternate authentication material triggering this event, the threat actor can now authenticate as the Application or Service Principal using this credential.

Additional information on OAuth Credential Grants can be found in RFC 6749 Section 4.4 or https://docs.microsoft.com/azure/active-directory/develop/v2-oauth2-client-creds-grant-flow

For further information on AuditLogs please see https://docs.microsoft.com/azure/active-directory/reports-monitoring/reference-audit-activities.
SeverityHigh
TacticsDefenseEvasion
TechniquesT1550.001
Required data connectorsAzureActiveDirectory
KindScheduled
Query frequency1h
Query period1h
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/FirstAppOrServicePrincipalCredential.yaml
Version1.1.5
Arm template2cfc3c6e-f424-4b88-9cc9-c89f482d016a.json
Deploy To Azure
AuditLogs
| where OperationName has ("Certificates and secrets management")
| where Result =~ "success"
| where tostring(InitiatedBy.user.userPrincipalName) has "@" or tostring(InitiatedBy.app.displayName) has "@"
| mv-apply TargetResource = TargetResources on 
  (
      where TargetResource.type =~ "Application"
      | extend targetDisplayName = tostring(TargetResource.displayName),
               targetId = tostring(TargetResource.id),
               targetType = tostring(TargetResource.type),
               keyEvents = TargetResource.modifiedProperties
  )
| mv-apply Property = keyEvents on 
  (
      where Property.displayName =~ "KeyDescription"
      | extend new_value_set = parse_json(tostring(Property.newValue)),
               old_value_set = parse_json(tostring(Property.oldValue))
  )
| where old_value_set == "[]"
| mv-expand new_value_set
| parse new_value_set with * "KeyIdentifier=" keyIdentifier:string ",KeyType=" keyType:string ",KeyUsage=" keyUsage:string ",DisplayName=" keyDisplayName:string "]" *
| where keyUsage =~ "Verify"
| mv-apply AdditionalDetail = AdditionalDetails on 
  (
      where AdditionalDetail.key =~ "User-Agent"
      | extend InitiatingUserAgent = tostring(AdditionalDetail.value)
  )
| project-away new_value_set, old_value_set, TargetResource, Property, AdditionalDetail
| extend InitiatingAppName = tostring(InitiatedBy.app.displayName)
| extend InitiatingAppServicePrincipalId = tostring(InitiatedBy.app.servicePrincipalId)
| extend InitiatingUserPrincipalName = tostring(InitiatedBy.user.userPrincipalName)
| extend InitiatingAadUserId = tostring(InitiatedBy.user.id)
| extend InitiatingIpAddress = tostring(iff(isnotempty(InitiatedBy.user.ipAddress), InitiatedBy.user.ipAddress, InitiatedBy.app.ipAddress))
| project-reorder TimeGenerated, OperationName, InitiatingUserPrincipalName, InitiatingAadUserId, InitiatingAppName, InitiatingAppServicePrincipalId, InitiatingIpAddress, InitiatingUserAgent, 
targetDisplayName, targetId, targetType, keyDisplayName, keyType, keyUsage, keyIdentifier, CorrelationId, TenantId
| extend Name = split(InitiatingUserPrincipalName, "@")[0], UPNSuffix = split(InitiatingUserPrincipalName, "@")[1]
triggerOperator: gt
tactics:
- DefenseEvasion
queryPeriod: 1h
kind: Scheduled
relevantTechniques:
- T1550.001
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/FirstAppOrServicePrincipalCredential.yaml
queryFrequency: 1h
description: |
  'This will alert when an admin or app owner account adds a new credential to an Application or Service Principal where there was no previous verify KeyCredential associated.
  If a threat actor obtains access to an account with sufficient privileges and adds the alternate authentication material triggering this event, the threat actor can now authenticate as the Application or Service Principal using this credential.
  Additional information on OAuth Credential Grants can be found in RFC 6749 Section 4.4 or https://docs.microsoft.com/azure/active-directory/develop/v2-oauth2-client-creds-grant-flow
  For further information on AuditLogs please see https://docs.microsoft.com/azure/active-directory/reports-monitoring/reference-audit-activities.'  
requiredDataConnectors:
- dataTypes:
  - AuditLogs
  connectorId: AzureActiveDirectory
version: 1.1.5
tags:
- Solorigate
- NOBELIUM
triggerThreshold: 0
severity: High
id: 2cfc3c6e-f424-4b88-9cc9-c89f482d016a
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: InitiatingUserPrincipalName
    identifier: FullName
  - columnName: Name
    identifier: Name
  - columnName: UPNSuffix
    identifier: UPNSuffix
- entityType: Account
  fieldMappings:
  - columnName: InitiatingAadUserId
    identifier: AadUserId
- entityType: Account
  fieldMappings:
  - columnName: InitiatingAppServicePrincipalId
    identifier: AadUserId
- entityType: IP
  fieldMappings:
  - columnName: InitiatingIpAddress
    identifier: Address
- entityType: CloudApplication
  fieldMappings:
  - columnName: targetDisplayName
    identifier: Name
status: Available
name: First access credential added to Application or Service Principal where no credential was present
query: |
  AuditLogs
  | where OperationName has ("Certificates and secrets management")
  | where Result =~ "success"
  | where tostring(InitiatedBy.user.userPrincipalName) has "@" or tostring(InitiatedBy.app.displayName) has "@"
  | mv-apply TargetResource = TargetResources on 
    (
        where TargetResource.type =~ "Application"
        | extend targetDisplayName = tostring(TargetResource.displayName),
                 targetId = tostring(TargetResource.id),
                 targetType = tostring(TargetResource.type),
                 keyEvents = TargetResource.modifiedProperties
    )
  | mv-apply Property = keyEvents on 
    (
        where Property.displayName =~ "KeyDescription"
        | extend new_value_set = parse_json(tostring(Property.newValue)),
                 old_value_set = parse_json(tostring(Property.oldValue))
    )
  | where old_value_set == "[]"
  | mv-expand new_value_set
  | parse new_value_set with * "KeyIdentifier=" keyIdentifier:string ",KeyType=" keyType:string ",KeyUsage=" keyUsage:string ",DisplayName=" keyDisplayName:string "]" *
  | where keyUsage =~ "Verify"
  | mv-apply AdditionalDetail = AdditionalDetails on 
    (
        where AdditionalDetail.key =~ "User-Agent"
        | extend InitiatingUserAgent = tostring(AdditionalDetail.value)
    )
  | project-away new_value_set, old_value_set, TargetResource, Property, AdditionalDetail
  | extend InitiatingAppName = tostring(InitiatedBy.app.displayName)
  | extend InitiatingAppServicePrincipalId = tostring(InitiatedBy.app.servicePrincipalId)
  | extend InitiatingUserPrincipalName = tostring(InitiatedBy.user.userPrincipalName)
  | extend InitiatingAadUserId = tostring(InitiatedBy.user.id)
  | extend InitiatingIpAddress = tostring(iff(isnotempty(InitiatedBy.user.ipAddress), InitiatedBy.user.ipAddress, InitiatedBy.app.ipAddress))
  | project-reorder TimeGenerated, OperationName, InitiatingUserPrincipalName, InitiatingAadUserId, InitiatingAppName, InitiatingAppServicePrincipalId, InitiatingIpAddress, InitiatingUserAgent, 
  targetDisplayName, targetId, targetType, keyDisplayName, keyType, keyUsage, keyIdentifier, CorrelationId, TenantId
  | extend Name = split(InitiatingUserPrincipalName, "@")[0], UPNSuffix = split(InitiatingUserPrincipalName, "@")[1]  
{
  "$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/2cfc3c6e-f424-4b88-9cc9-c89f482d016a')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/2cfc3c6e-f424-4b88-9cc9-c89f482d016a')]",
      "properties": {
        "alertRuleTemplateName": "2cfc3c6e-f424-4b88-9cc9-c89f482d016a",
        "customDetails": null,
        "description": "'This will alert when an admin or app owner account adds a new credential to an Application or Service Principal where there was no previous verify KeyCredential associated.\nIf a threat actor obtains access to an account with sufficient privileges and adds the alternate authentication material triggering this event, the threat actor can now authenticate as the Application or Service Principal using this credential.\nAdditional information on OAuth Credential Grants can be found in RFC 6749 Section 4.4 or https://docs.microsoft.com/azure/active-directory/develop/v2-oauth2-client-creds-grant-flow\nFor further information on AuditLogs please see https://docs.microsoft.com/azure/active-directory/reports-monitoring/reference-audit-activities.'\n",
        "displayName": "First access credential added to Application or Service Principal where no credential was present",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "InitiatingUserPrincipalName",
                "identifier": "FullName"
              },
              {
                "columnName": "Name",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "InitiatingAadUserId",
                "identifier": "AadUserId"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "InitiatingAppServicePrincipalId",
                "identifier": "AadUserId"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "InitiatingIpAddress",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "CloudApplication",
            "fieldMappings": [
              {
                "columnName": "targetDisplayName",
                "identifier": "Name"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/FirstAppOrServicePrincipalCredential.yaml",
        "query": "AuditLogs\n| where OperationName has (\"Certificates and secrets management\")\n| where Result =~ \"success\"\n| where tostring(InitiatedBy.user.userPrincipalName) has \"@\" or tostring(InitiatedBy.app.displayName) has \"@\"\n| mv-apply TargetResource = TargetResources on \n  (\n      where TargetResource.type =~ \"Application\"\n      | extend targetDisplayName = tostring(TargetResource.displayName),\n               targetId = tostring(TargetResource.id),\n               targetType = tostring(TargetResource.type),\n               keyEvents = TargetResource.modifiedProperties\n  )\n| mv-apply Property = keyEvents on \n  (\n      where Property.displayName =~ \"KeyDescription\"\n      | extend new_value_set = parse_json(tostring(Property.newValue)),\n               old_value_set = parse_json(tostring(Property.oldValue))\n  )\n| where old_value_set == \"[]\"\n| mv-expand new_value_set\n| parse new_value_set with * \"KeyIdentifier=\" keyIdentifier:string \",KeyType=\" keyType:string \",KeyUsage=\" keyUsage:string \",DisplayName=\" keyDisplayName:string \"]\" *\n| where keyUsage =~ \"Verify\"\n| mv-apply AdditionalDetail = AdditionalDetails on \n  (\n      where AdditionalDetail.key =~ \"User-Agent\"\n      | extend InitiatingUserAgent = tostring(AdditionalDetail.value)\n  )\n| project-away new_value_set, old_value_set, TargetResource, Property, AdditionalDetail\n| extend InitiatingAppName = tostring(InitiatedBy.app.displayName)\n| extend InitiatingAppServicePrincipalId = tostring(InitiatedBy.app.servicePrincipalId)\n| extend InitiatingUserPrincipalName = tostring(InitiatedBy.user.userPrincipalName)\n| extend InitiatingAadUserId = tostring(InitiatedBy.user.id)\n| extend InitiatingIpAddress = tostring(iff(isnotempty(InitiatedBy.user.ipAddress), InitiatedBy.user.ipAddress, InitiatedBy.app.ipAddress))\n| project-reorder TimeGenerated, OperationName, InitiatingUserPrincipalName, InitiatingAadUserId, InitiatingAppName, InitiatingAppServicePrincipalId, InitiatingIpAddress, InitiatingUserAgent, \ntargetDisplayName, targetId, targetType, keyDisplayName, keyType, keyUsage, keyIdentifier, CorrelationId, TenantId\n| extend Name = split(InitiatingUserPrincipalName, \"@\")[0], UPNSuffix = split(InitiatingUserPrincipalName, \"@\")[1]\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "High",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion"
        ],
        "tags": [
          "Solorigate",
          "NOBELIUM"
        ],
        "techniques": [
          "T1550"
        ],
        "templateVersion": "1.1.5",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}