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/Azure Active Directory/Analytic Rules/SuspiciousServicePrincipalcreationactivity.yaml
Version	1.0.2
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 userPrincipalName_creator = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)
  | extend ipAddress_creator = 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 userPrincipalName_deleter = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)
  | extend ipAddress_deleter = 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, userPrincipalName_creator, userPrincipalName_deleter, ipAddress_creator, ipAddress_deleter, list_Activities, list_AssignedRoles, AliveTime

YAML

queryPeriod: 70m
version: 1.0.2
relevantTechniques:
- T1078
- T1528
queryFrequency: 1h
kind: Scheduled
name: Suspicious Service Principal creation activity
id: 6852d9da-8015-4b95-8ecf-d9572ee0395d
entityMappings:
- fieldMappings:
  - columnName: userPrincipalName_creator
    identifier: FullName
  entityType: Account
- fieldMappings:
  - columnName: userPrincipalName_deleter
    identifier: FullName
  entityType: Account
- fieldMappings:
  - columnName: ipAddress_creator
    identifier: Address
  entityType: IP
- fieldMappings:
  - columnName: ipAddress_deleter
    identifier: Address
  entityType: IP
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Active Directory/Analytic Rules/SuspiciousServicePrincipalcreationactivity.yaml
severity: Low
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 userPrincipalName_creator = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)
    | extend ipAddress_creator = 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 userPrincipalName_deleter = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)
    | extend ipAddress_deleter = 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, userPrincipalName_creator, userPrincipalName_deleter, ipAddress_creator, ipAddress_deleter, list_Activities, list_AssignedRoles, AliveTime  
tactics:
- CredentialAccess
- PrivilegeEscalation
- InitialAccess
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)'
requiredDataConnectors:
- connectorId: AzureActiveDirectory
  dataTypes:
  - AuditLogs
  - AADServicePrincipalSignInLogs
status: Available
triggerThreshold: 0
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": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/6852d9da-8015-4b95-8ecf-d9572ee0395d')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/6852d9da-8015-4b95-8ecf-d9572ee0395d')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "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)'\n",
        "severity": "Low",
        "enabled": true,
        "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 userPrincipalName_creator = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)\n  | extend ipAddress_creator = 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 userPrincipalName_deleter = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)\n  | extend ipAddress_deleter = 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, userPrincipalName_creator, userPrincipalName_deleter, ipAddress_creator, ipAddress_deleter, list_Activities, list_AssignedRoles, AliveTime\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT70M",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess",
          "PrivilegeEscalation",
          "InitialAccess"
        ],
        "techniques": [
          "T1078",
          "T1528"
        ],
        "alertRuleTemplateName": "6852d9da-8015-4b95-8ecf-d9572ee0395d",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "userPrincipalName_creator"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "userPrincipalName_deleter"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "ipAddress_creator"
              }
            ],
            "entityType": "IP"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "ipAddress_deleter"
              }
            ],
            "entityType": "IP"
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Active Directory/Analytic Rules/SuspiciousServicePrincipalcreationactivity.yaml",
        "status": "Available",
        "templateVersion": "1.0.2"
      }
    }
  ]
}