持續性：新 API 方法

本文說明 Security Command Center 中的威脅發現項目類型。威脅偵測工具在雲端資源中偵測到潛在威脅時，就會產生威脅發現項目。如需可用威脅發現項目的完整清單，請參閱威脅發現項目索引。

總覽

系統在組織、資料夾或專案中，偵測到潛在惡意行為人的異常管理活動。異常活動可能是下列任一情況：

  • 主體在機構、資料夾或專案中進行新活動
  • 主體在機構、資料夾或專案中一段時間未執行的活動

Event Threat Detection 是這項發現項目的來源。

回應方式

如要回應這項發現項目，請按照下列步驟操作：

步驟 1：查看調查結果詳細資料

  1. 按照「查看發現項目」一文的說明，開啟 Persistence: New API Method 發現項目。

  2. 在「Summary」(摘要) 分頁的調查結果詳細資料中，請注意下列欄位的值：

    • 在「偵測到的內容」下方：
      • 主體電子郵件地址：發出呼叫的帳戶
      • 服務名稱：動作中使用的 Google Cloud 服務 API 名稱
      • 方法名稱：呼叫的方法
    • 在「受影響的資源」下方：
      • 資源顯示名稱：受影響資源的名稱，可能與機構、資料夾或專案的名稱相同
      • 資源路徑：活動發生的資源階層位置

步驟 2：研究攻擊和應變方法

  1. 查看這類發現項目 (「持續性」) 的 MITRE ATT&CK 框架項目。
  2. 調查該項操作是否經過機構、資料夾或專案授權，以及是否由帳戶的合法擁有者執行。組織、資料夾或專案會顯示在「資源路徑」列，帳戶則會顯示在「主體電子郵件」列。
  3. 如要制定回應計畫，請將調查結果與 MITRE 研究結合。

發現項目 JSON 範例

以下是發現項目 JSON 的範例。

{
 "findings": {
   "access": {
     "principalEmail": "PRINCIPAL_EMAIL",
     "callerIp": "IP_ADDRESS",
     "callerIpGeo": {
        "regionCode": "US"
      },
     "serviceName": "SERVICE_NAME",
     "methodName": "METHOD_NAME",
     "principalSubject": "PRINCIPAL_SUBJECT",
     "serviceAccountKeyName": "SERVICE_ACCOUNT_KEY_NAME"
   },
   "assetDisplayName": "ASSET_DISPLAY_NAME",
   "assetId": "organizations/ORGANIZATION_NUMBER/assets/ASSET_ID",
   "canonicalName": "projects/PROJECT_NUMBER/sources/SOURCE_ID/findings/FINDING_ID",
   "category": "Persistence: New API Method",
   "contacts": {
     "security": {
       "contacts": [
         {
           "email": "EMAIL_ADDRESS"
         },
         {
           "email": "EMAIL_ADDRESS"
         },
         {
           "email": "EMAIL_ADDRESS"
         }
       ]
     },
     "technical": {
       "contacts": [
         {
           "email": "EMAIL_ADDRESS"
         },
         {
           "email": "EMAIL_ADDRESS"
         },
         {
           "email": "EMAIL_ADDRESS"
         }
       ]
     }
   },
   "createTime": "2023-01-12T10:35:47.381Z",
   "database": {},
   "eventTime": "2023-01-12T10:35:47.270Z",
   "exfiltration": {},
   "findingClass": "THREAT",
   "findingProviderId": "organizations/ORGANIZATION_NUMBER/firstPartyFindingProviders/etd",
   "indicator": {},
   "kernelRootkit": {},
   "kubernetes": {},
   "mitreAttack": {},
   "mute": "UNDEFINED",
   "name": "organizations/ORGANIZATION_NUMBER/sources/SOURCE_ID/findings/FINDING_ID",
   "parent": "organizations/ORGANIZATION_NUMBER/sources/SOURCE_ID",
   "parentDisplayName": "Event Threat Detection",
   "resourceName": "//cloudresourcemanager.googleapis.com/projects/PROJECT_NUMBER",
   "severity": "LOW",
   "sourceDisplayName": "Event Threat Detection",
   "state": "ACTIVE",
   "vulnerability": {},
   "workflowState": "NEW"
 },
 "resource": {
   "name": "RESOURCE_NAME",
   "display_name": "RESOURCE_DISPLAY_NAME",
   "project_name": "//cloudresourcemanager.googleapis.com/projects/PROJECT_NUMBER",
   "project_display_name": "PROJECT_ID",
   "parent_name": "//cloudresourcemanager.googleapis.com/folders/FOLDER_NUMBER",
   "parent_display_name": "FOLDER_NAME",
   "type": "RESOURCE_TYPE",
   "folders": [
     {
       "resourceFolderDisplayName": "FOLDER_NAME",
       "resourceFolder": "//cloudresourcemanager.googleapis.com/folders/FOLDER_NUMBER"
     }
   ]
 },
 "sourceProperties": {
   "sourceId": {
     "projectNumber": "PROJECT_NUMBER",
     "customerOrganizationNumber": "ORGANIZATION_NUMBER"
   },
   "detectionCategory": {
     "technique": "persistence",
     "indicator": "audit_log",
     "ruleName": "anomalous_behavior",
     "subRuleName": "new_api_method"
   },
   "detectionPriority": "LOW",
   "affectedResources": [
     {
       "gcpResourceName": "//cloudresourcemanager.googleapis.com/projects/PROJECT_NUMBER"
     }
   ],
   "evidence": [
     {
       "sourceLogId": {
         "projectId": "PROJECT_ID",
         "resourceContainer": "projects/PROJECT_ID",
         "timestamp": {
           "seconds": "1673519681",
           "nanos": 728289000
         },
         "insertId": "INSERT_ID"
       }
     }
   ],
   "properties": {
     "newApiMethod": {
       "newApiMethod": {
         "serviceName": "SERVICE_NAME",
         "methodName": "METHOD_NAME"
       },
       "principalEmail": "PRINCIPAL_EMAIL",
       "callerIp": "IP_ADDRESS",
       "callerUserAgent": "CALLER_USER_AGENT",
       "resourceContainer": "projects/PROJECT_NUMBER"
     }
   },
   "findingId": "FINDING_ID",
   "contextUris": {
     "mitreUri": {
       "displayName": "MITRE Link",
       "url": "https://attack.mitre.org/tactics/TA0003/"
     }
   }
 }
}

後續步驟