橫向移動：連接至執行個體的開機磁碟已修改

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

系統會檢查稽核記錄，偵測 Compute Engine 執行個體資源之間的可疑磁碟移動情形。可能經過修改的開機磁碟已附加至 Compute Engine。

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. 如「查看發現項目」一文所述，開啟 Lateral Movement: Modify Boot Disk Attaching to Instance 發現項目。系統會開啟發現項目的詳細資料面板，並顯示「摘要」分頁。

  2. 在「Summary」(摘要) 分頁中，請記下下列欄位的值。

    「偵測到的內容」下方會顯示以下資訊：

    • 主體電子郵件地址：執行動作的服務帳戶
    • 服務名稱：服務帳戶存取的 Google Cloud 服務的 API 名稱
    • 方法名稱：呼叫的方法

步驟 2：研究攻擊和應變方法

  1. 使用服務帳戶工具 (例如活動分析器)，調查相關聯服務帳戶的活動。
  2. 與「主體電子郵件地址」欄位中的服務帳戶擁有者聯絡。 確認該動作是否由合法擁有者執行。

步驟 3：實作回應

下列應變計畫可能適用於這項發現，但也可能影響作業。 請仔細評估調查期間收集到的資訊，找出解決問題的最佳方式。

  • 請與執行動作的專案擁有者聯絡。
  • 考慮為 Compute Engine VM 執行個體使用安全啟動。
  • 請考慮刪除可能遭入侵的服務帳戶，並輪替及刪除可能遭入侵專案的所有服務帳戶存取金鑰。刪除後，使用服務帳戶進行驗證的應用程式會失去存取權。繼續操作前，安全團隊應找出所有受影響的應用程式，並與應用程式擁有者合作，確保業務持續運作。
  • 與安全團隊合作找出不熟悉的資源，包括 Compute Engine 執行個體、快照、服務帳戶和 IAM 使用者。刪除非授權帳戶建立的資源。
  • 回覆 Google Cloud 支援團隊的任何通知。

發現項目 JSON 範例

以下是發現項目 JSON 的範例。

{
  "finding": {
    "access": {
      "principalEmail": "PRINCIPAL_EMAIL",
      "callerIpGeo": {},
      "serviceName": "compute.googleapis.com",
      "methodName": "v1.compute.instances.attachDisk",
    },
    "application": {},
    "attackExposure": {},
    "canonicalName": "projects/PROJECT_NUMBER/sources/SOURCE_ID/locations/global/findings/FINDING_ID",
    "category": "Lateral Movement: Modify Boot Disk Attaching to Instance",
    "cloudDlpDataProfile": {},
    "cloudDlpInspection": {},
    "createTime": "2024-02-01T23:55:17.589Z",
    "database": {},
    "eventTime": "2024-02-01T23:55:17.396Z",
    "exfiltration": {},
    "findingClass": "THREAT",
    "findingProviderId": "organizations/ORGANIZATION_NUMBER/firstPartyFindingProviders/etd",
    "indicator": {},
    "kernelRootkit": {},
    "kubernetes": {},
    "logEntries": [
      {
        "cloudLoggingEntry": {
          "insertId": "INSERT_ID",
          "logId": "cloudaudit.googleapis.com/activity",
          "resourceContainer": "projects/PROJECT_NUMBER",
          "timestamp": "2024-02-01T23:55:15.017887Z"
        }
      }
    ],
    "mitreAttack": {
      "primaryTactic": "TACTIC_UNSPECIFIED"
    },
    "mute": "UNDEFINED",
    "name": "organizations/ORGANIZATION_NUMBER/sources/SOURCE_ID/locations/LOCATION/findings/FINDING_ID",
    "parent": "organizations/ORGANIZATION_NUMBER/sources/SOURCE_ID/locations/LOCATION",
    "parentDisplayName": "Event Threat Detection",
    "resourceName": "//compute.googleapis.com/projects/PROJECT_NUMBER/zones/ZONE_ID/instances/INSTANCE_ID",
    "securityPosture": {},
    "severity": "LOW",
    "state": "ACTIVE",
    "vulnerability": {},
    "externalSystems": {}
  },
  "resource": {
    "name": "//compute.googleapis.com/projects/PROJECT_NUMBER/zones/ZONE_ID/instances/INSTANCE_ID",
    "displayName": "INSTANCE_ID",
    "type": "google.compute.Instance",
    "gcpMetadata": {
      "project": "//cloudresourcemanager.googleapis.com/projects/PROJECT_NUMBER",
      "projectDisplayName": "PROJECT_NUMBER",
      "parent": "//cloudresourcemanager.googleapis.com/projects/PROJECT_NUMBER",
      "parentDisplayName": "PROJECT_NUMBER",
      "folders": [
        {
          "resourceFolder": "//cloudresourcemanager.googleapis.com/folders/FOLDER_NUMBER",
          "resourceFolderDisplayName": "FOLDER_NUMBER"
        }
      ],
      "organization": "organizations/ORGANIZATION_NUMBER"
    }
  },
  "sourceProperties": {
    "sourceId": {
      "projectNumber": "PROJECT_NUMBER",
      "customerOrganizationNumber": "ORGANIZATION_NUMBER"
    },
    "detectionCategory": {
      "ruleName": "modify_boot_disk",
      "subRuleName": "attach_to_instance"
    },
    "detectionPriority": "LOW",
    "affectedResources": [
      {
        "gcpResourceName": "//compute.googleapis.com/projects/PROJECT_NUMBER/zones/ZONE_ID/instances/INSTANCE_ID"
      },
      {
        "gcpResourceName": "//cloudresourcemanager.googleapis.com/projects/PROJECT_NUMBER"
      },
      {
        "gcpResourceName": "https://www.googleapis.com/compute/v1/projects/PROJECT_NUMBER/zones/ZONE_ID/disks/INSTANCE_ID"
      },
      {
        "gcpResourceName": "projects/PROJECT_NUMBER/zones/ZONE_ID/instances/INSTANCE_ID"
      }
    ],
    "evidence": [
      {
        "sourceLogId": {
          "projectId": "PROJECT_NUMBER",
          "resourceContainer": "PROJECT_NUMBER",
          "timestamp": {
            "seconds": "1706831715",
            "nanos": 17887000
          },
          "insertId": "INSERT_ID",
          "logId": "cloudaudit.googleapis.com/activity"
        }
      }
    ],
    "properties": {
      "diskId": "https://www.googleapis.com/compute/v1/projects/PROJECT_NUMBER/zones/ZONE_ID/disks/DISK_ID",
      "targetInstance": "projects/PROJECT_NUMBER/zones/ZONE_ID/instances/INSTANCE_ID",
      "workerInstances": [
        "projects/PROJECT_NUMBER/zones/ZONE_ID/instances/INSTANCE_ID"
      ],
      "bootDiskPayloads": [
        {
          "instanceId": "projects/PROJECT_NUMBER/zones/ZONE_ID/instances/INSTANCE_ID",
          "operation": "MODIFY_BOOT_DISK_ATTACH",
          "principalEmail": "PRINCIPAL_EMAIL",
          "eventTime": "2024-02-01T23:55:06.706640Z"
        },
        {
          "instanceId": "projects/PROJECT_NUMBER/zones/ZONE_ID/instances/INSTANCE_ID",
          "operation": "MODIFY_BOOT_DISK_DETACH",
          "principalEmail": "PRINCIPAL_EMAIL",
          "eventTime": "2024-02-01T23:55:05.608631Z"
        }
      ]
    },
    "findingId": "FINDING_ID",
    "contextUris": {
      "mitreUri": {
        "displayName": "MITRE Link",
        "url": "https://attack.mitre.org/techniques/T1570/"
      },
      "cloudLoggingQueryUri": [
        {
          "displayName": "Cloud Logging Query Link",
          "url": "https://console.cloud.google.com/logs/query;query=timestamp%3D%222024-02-01T23:55:15.017887Z%22%0AinsertId%3D%22INSERT_ID?project=PROJECT_NUMBER"
        }
      ],
      "relatedFindingUri": {}
    }
  }
}

後續步驟