Suspicious Service Principal creation activity

Back


Id	6852d9da-8015-4b95-8ecf-d9572ee0395d
Rulename	Suspicious Service Principal creation activity
Description	This alert will detect creation of an SPN, permissions granted, credentials created, activity and deletion of the SPN in a time frame (default 10 minutes)
Severity	Low
Tactics	CredentialAccess PrivilegeEscalation InitialAccess
Techniques	T1078 T1528
Required data connectors	AzureActiveDirectory
Kind	Scheduled
Query frequency	1h
Query period	70m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/SuspiciousServicePrincipalcreationactivity.yaml
Version	1.0.3
Arm template	6852d9da-8015-4b95-8ecf-d9572ee0395d.json

KQL

let queryfrequency = 1h;
let wait_for_deletion = 10m;
let account_created =
  AuditLogs 
  | where ActivityDisplayName == "Add service principal"
  | where Result == "success"
  | extend AppID = tostring(AdditionalDetails[1].value)
  | extend creationTime = ActivityDateTime
  | extend CreatorUserPrincipalName = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)
  | extend CreatorIPAddress = tostring(parse_json(tostring(InitiatedBy.user)).ipAddress);
let account_activity =
  AADServicePrincipalSignInLogs
  | extend Activities = pack("ActivityTime", TimeGenerated ,"IpAddress", IPAddress, "ResourceDisplayName", ResourceDisplayName)
  | extend AppID = AppId
  | summarize make_list(Activities) by AppID;
let account_deleted =
  AuditLogs 
  | where OperationName == "Remove service principal"
  | where Result == "success"
  | extend AppID = tostring(AdditionalDetails[1].value)
  | extend deletionTime = ActivityDateTime
  | extend DeleterUserPrincipalName = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)
  | extend DeleterIPAddress = tostring(parse_json(tostring(InitiatedBy.user)).ipAddress);
let account_credentials =
  AuditLogs
  | where OperationName has_all ("Update application", "Certificates and secrets management")
  | where Result == "success"
  | extend AppID = tostring(AdditionalDetails[1].value)
  | extend credentialCreationTime = ActivityDateTime;
let roles_assigned =
  AuditLogs
  | where ActivityDisplayName == "Add app role assignment to service principal"
  | extend AppID = tostring(TargetResources[1].displayName)
  | extend AssignedRole =  iff(tostring(parse_json(tostring(TargetResources[0].modifiedProperties))[1].displayName)=="AppRole.Value", tostring(parse_json(tostring(parse_json(tostring(TargetResources[0].modifiedProperties))[1].newValue))),"")
  | extend AssignedRoles = pack("Role", AssignedRole)
  | summarize make_list(AssignedRoles) by AppID;
account_created
| where TimeGenerated between (ago(wait_for_deletion+queryfrequency)..ago(wait_for_deletion))
| join kind= inner (account_activity) on AppID
| join kind= inner (account_deleted) on AppID
| join kind= inner (account_credentials) on AppID
| join kind= inner (roles_assigned) on AppID
| where deletionTime - creationTime between (time(0s)..wait_for_deletion)
| extend AliveTime = deletionTime - creationTime
| project AADTenantId, AppID, creationTime, deletionTime, CreatorUserPrincipalName, DeleterUserPrincipalName, CreatorIPAddress, DeleterIPAddress, list_Activities, list_AssignedRoles, AliveTime
| extend CreatorName = tostring(split(CreatorUserPrincipalName, "@")[0]), CreatorUPNSuffix = tostring(split(CreatorUserPrincipalName, "@")[1])
| extend DeleterName = tostring(split(DeleterUserPrincipalName, "@")[0]), DeleterSuffix = tostring(split(DeleterUserPrincipalName, "@")[1])

YAML

id: 6852d9da-8015-4b95-8ecf-d9572ee0395d
tactics:
- CredentialAccess
- PrivilegeEscalation
- InitialAccess
queryPeriod: 70m
triggerThreshold: 0
name: Suspicious Service Principal creation activity
query: |
  let queryfrequency = 1h;
  let wait_for_deletion = 10m;
  let account_created =
    AuditLogs 
    | where ActivityDisplayName == "Add service principal"
    | where Result == "success"
    | extend AppID = tostring(AdditionalDetails[1].value)
    | extend creationTime = ActivityDateTime
    | extend CreatorUserPrincipalName = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)
    | extend CreatorIPAddress = tostring(parse_json(tostring(InitiatedBy.user)).ipAddress);
  let account_activity =
    AADServicePrincipalSignInLogs
    | extend Activities = pack("ActivityTime", TimeGenerated ,"IpAddress", IPAddress, "ResourceDisplayName", ResourceDisplayName)
    | extend AppID = AppId
    | summarize make_list(Activities) by AppID;
  let account_deleted =
    AuditLogs 
    | where OperationName == "Remove service principal"
    | where Result == "success"
    | extend AppID = tostring(AdditionalDetails[1].value)
    | extend deletionTime = ActivityDateTime
    | extend DeleterUserPrincipalName = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)
    | extend DeleterIPAddress = tostring(parse_json(tostring(InitiatedBy.user)).ipAddress);
  let account_credentials =
    AuditLogs
    | where OperationName has_all ("Update application", "Certificates and secrets management")
    | where Result == "success"
    | extend AppID = tostring(AdditionalDetails[1].value)
    | extend credentialCreationTime = ActivityDateTime;
  let roles_assigned =
    AuditLogs
    | where ActivityDisplayName == "Add app role assignment to service principal"
    | extend AppID = tostring(TargetResources[1].displayName)
    | extend AssignedRole =  iff(tostring(parse_json(tostring(TargetResources[0].modifiedProperties))[1].displayName)=="AppRole.Value", tostring(parse_json(tostring(parse_json(tostring(TargetResources[0].modifiedProperties))[1].newValue))),"")
    | extend AssignedRoles = pack("Role", AssignedRole)
    | summarize make_list(AssignedRoles) by AppID;
  account_created
  | where TimeGenerated between (ago(wait_for_deletion+queryfrequency)..ago(wait_for_deletion))
  | join kind= inner (account_activity) on AppID
  | join kind= inner (account_deleted) on AppID
  | join kind= inner (account_credentials) on AppID
  | join kind= inner (roles_assigned) on AppID
  | where deletionTime - creationTime between (time(0s)..wait_for_deletion)
  | extend AliveTime = deletionTime - creationTime
  | project AADTenantId, AppID, creationTime, deletionTime, CreatorUserPrincipalName, DeleterUserPrincipalName, CreatorIPAddress, DeleterIPAddress, list_Activities, list_AssignedRoles, AliveTime
  | extend CreatorName = tostring(split(CreatorUserPrincipalName, "@")[0]), CreatorUPNSuffix = tostring(split(CreatorUserPrincipalName, "@")[1])
  | extend DeleterName = tostring(split(DeleterUserPrincipalName, "@")[0]), DeleterSuffix = tostring(split(DeleterUserPrincipalName, "@")[1])  
severity: Low
triggerOperator: gt
kind: Scheduled
relevantTechniques:
- T1078
- T1528
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/SuspiciousServicePrincipalcreationactivity.yaml
queryFrequency: 1h
requiredDataConnectors:
- connectorId: AzureActiveDirectory
  dataTypes:
  - AuditLogs
  - AADServicePrincipalSignInLogs
description: |
    'This alert will detect creation of an SPN, permissions granted, credentials created, activity and deletion of the SPN in a time frame (default 10 minutes)'
status: Available
version: 1.0.3
entityMappings:
- fieldMappings:
  - columnName: CreatorUserPrincipalName
    identifier: FullName
  - columnName: CreatorName
    identifier: Name
  - columnName: CreatorUPNSuffix
    identifier: UPNSuffix
  entityType: Account
- fieldMappings:
  - columnName: DeleterUserPrincipalName
    identifier: FullName
  - columnName: DeleterName
    identifier: Name
  - columnName: DeleterSuffix
    identifier: UPNSuffix
  entityType: Account
- fieldMappings:
  - columnName: CreatorIPAddress
    identifier: Address
  entityType: IP
- fieldMappings:
  - columnName: DeleterIPAddress
    identifier: Address
  entityType: IP

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/6852d9da-8015-4b95-8ecf-d9572ee0395d')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/6852d9da-8015-4b95-8ecf-d9572ee0395d')]",
      "properties": {
        "alertRuleTemplateName": "6852d9da-8015-4b95-8ecf-d9572ee0395d",
        "customDetails": null,
        "description": "'This alert will detect creation of an SPN, permissions granted, credentials created, activity and deletion of the SPN in a time frame (default 10 minutes)'\n",
        "displayName": "Suspicious Service Principal creation activity",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "CreatorUserPrincipalName",
                "identifier": "FullName"
              },
              {
                "columnName": "CreatorName",
                "identifier": "Name"
              },
              {
                "columnName": "CreatorUPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "DeleterUserPrincipalName",
                "identifier": "FullName"
              },
              {
                "columnName": "DeleterName",
                "identifier": "Name"
              },
              {
                "columnName": "DeleterSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "CreatorIPAddress",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "DeleterIPAddress",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/SuspiciousServicePrincipalcreationactivity.yaml",
        "query": "let queryfrequency = 1h;\nlet wait_for_deletion = 10m;\nlet account_created =\n  AuditLogs \n  | where ActivityDisplayName == \"Add service principal\"\n  | where Result == \"success\"\n  | extend AppID = tostring(AdditionalDetails[1].value)\n  | extend creationTime = ActivityDateTime\n  | extend CreatorUserPrincipalName = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)\n  | extend CreatorIPAddress = tostring(parse_json(tostring(InitiatedBy.user)).ipAddress);\nlet account_activity =\n  AADServicePrincipalSignInLogs\n  | extend Activities = pack(\"ActivityTime\", TimeGenerated ,\"IpAddress\", IPAddress, \"ResourceDisplayName\", ResourceDisplayName)\n  | extend AppID = AppId\n  | summarize make_list(Activities) by AppID;\nlet account_deleted =\n  AuditLogs \n  | where OperationName == \"Remove service principal\"\n  | where Result == \"success\"\n  | extend AppID = tostring(AdditionalDetails[1].value)\n  | extend deletionTime = ActivityDateTime\n  | extend DeleterUserPrincipalName = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)\n  | extend DeleterIPAddress = tostring(parse_json(tostring(InitiatedBy.user)).ipAddress);\nlet account_credentials =\n  AuditLogs\n  | where OperationName has_all (\"Update application\", \"Certificates and secrets management\")\n  | where Result == \"success\"\n  | extend AppID = tostring(AdditionalDetails[1].value)\n  | extend credentialCreationTime = ActivityDateTime;\nlet roles_assigned =\n  AuditLogs\n  | where ActivityDisplayName == \"Add app role assignment to service principal\"\n  | extend AppID = tostring(TargetResources[1].displayName)\n  | extend AssignedRole =  iff(tostring(parse_json(tostring(TargetResources[0].modifiedProperties))[1].displayName)==\"AppRole.Value\", tostring(parse_json(tostring(parse_json(tostring(TargetResources[0].modifiedProperties))[1].newValue))),\"\")\n  | extend AssignedRoles = pack(\"Role\", AssignedRole)\n  | summarize make_list(AssignedRoles) by AppID;\naccount_created\n| where TimeGenerated between (ago(wait_for_deletion+queryfrequency)..ago(wait_for_deletion))\n| join kind= inner (account_activity) on AppID\n| join kind= inner (account_deleted) on AppID\n| join kind= inner (account_credentials) on AppID\n| join kind= inner (roles_assigned) on AppID\n| where deletionTime - creationTime between (time(0s)..wait_for_deletion)\n| extend AliveTime = deletionTime - creationTime\n| project AADTenantId, AppID, creationTime, deletionTime, CreatorUserPrincipalName, DeleterUserPrincipalName, CreatorIPAddress, DeleterIPAddress, list_Activities, list_AssignedRoles, AliveTime\n| extend CreatorName = tostring(split(CreatorUserPrincipalName, \"@\")[0]), CreatorUPNSuffix = tostring(split(CreatorUserPrincipalName, \"@\")[1])\n| extend DeleterName = tostring(split(DeleterUserPrincipalName, \"@\")[0]), DeleterSuffix = tostring(split(DeleterUserPrincipalName, \"@\")[1])\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT70M",
        "severity": "Low",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess",
          "InitialAccess",
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1078",
          "T1528"
        ],
        "templateVersion": "1.0.3",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}