Collect Google Cloud IoT logs

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This guide explains how to export Google Cloud IoT logs to Google Security Operations using Cloud Storage. The parser extracts fields from JSON-formatted logs and then maps those fields to the corresponding fields in the Google SecOps UDM schema, ultimately transforming raw log data into a structured format suitable for security analysis.

Before You Begin

Ensure that you have the following prerequisites:

  • Google SecOps instance.
  • IoT is set up and active in your Google Cloud environment.
  • Privileged access to Google Cloud.

Create a Google Cloud Storage Bucket

  1. Sign in to the Google Cloud console.

  2. Go to the Cloud Storage Buckets page.

    Go to Buckets

  3. Click Create.

  4. On the Create a bucket page, enter your bucket information. After each of the following steps, click Continue to proceed to the next step:

    1. In the Get started section, do the following:

      1. Enter a unique name that meets the bucket name requirements; for example, cloudiot-logs.

      2. To enable hierarchical namespace, click the expander arrow to expand the Optimize for file oriented and data-intensive workloads section, and then select Enable Hierarchical namespace on this bucket.

      3. To add a bucket label, click the expander arrow to expand the Labels section.

      4. Click Add label, and specify a key and a value for your label.

    2. In the Choose where to store your data section, do the following:

      1. Select a Location type.

      2. Use the location type menu to select a Location where object data within your bucket will be permanently stored.

      3. To set up cross-bucket replication, expand the Set up cross-bucket replication section.

    3. In the Choose a storage class for your data section, either select a default storage class for the bucket, or select Autoclass for automatic storage class management of your bucket's data.

    4. In the Choose how to control access to objects section, select not to enforce public access prevention, and select an access control model for your bucket's objects.

    5. In the Choose how to protect object data section, do the following:

      1. Select any of the options under Data protection that you want to set for your bucket.
      2. To choose how your object data will be encrypted, click the expander arrow labeled Data encryption, and select a Data encryption method.

  5. Click Create.

Configure Log Export in Google Cloud IoT

  1. Sign in to Google Cloud account using your privileged account.
  2. Search and select Logging in the search bar.
  3. In Log Explorer, filter the logs by choosing Cloud IoT Core and click Apply.
  4. Click More Actions.
  5. Click Create Sink.
  6. Provide the following configurations:
    1. Sink Details: enter a name and description.
    2. Click Next.
    3. Sink Destination: select Cloud Storage Bucket.
    4. Cloud Storage Bucket: select the bucket created earlier or create a new bucket.
    5. Click Next.
    6. Choose Logs to include in Sink: a default log is populated when you select an option in Cloud Storage Bucket.
    7. Click Next.
    8. Optional: Choose Logs to filter out of Sink: select the logs that you would like not to sink.

  7. Click Create Sink.

  8. In the GCP console, go to Logging > Log Router.

  9. Click Create Sink.

Set up feeds

To configure a feed, follow these steps:

  1. Go to SIEM Settings > Feeds.
  2. Click Add New Feed.
  3. On the next page, click Configure a single feed.
  4. In the Feed name field, enter a name for the feed; for example, GCP Cloud IoT Logs.
  5. Select Google Cloud Storage V2 as the Source type.
  6. Select GCP Cloud IoT as the Log type.
  7. Click Get Service Account as the Chronicle Service Account.
  8. Click Next.

  9. Specify values for the following input parameters:

    • Storage Bucket URI: Google Cloud storage bucket URL in gs://my-bucket/<value> format.

    • Source deletion options: select deletion option according to your preference.

    • Maximum File Age: Includes files modified in the last number of days. Default is 180 days

  10. Click Next.

  11. Review your new feed configuration in the Finalize screen, and then click Submit.

UDM Mapping Table

Log Field UDM Mapping Logic
insertId metadata.product_log_id Directly mapped from insertId field.
jsonPayload.eventType metadata.product_event_type Directly mapped from jsonPayload.eventType field.
jsonPayload.protocol network.application_protocol Directly mapped from jsonPayload.protocol field.
jsonPayload.serviceName target.application Directly mapped from jsonPayload.serviceName field.
jsonPayload.status.description metadata.description Directly mapped from jsonPayload.status.description field.
jsonPayload.status.message security_result.description Directly mapped from jsonPayload.status.message field.
labels.device_id principal.asset_id Value is set to Device ID: concatenated with the value of labels.device_id field.
receiveTimestamp metadata.event_timestamp Parsed from the receiveTimestamp field and used to populate both events.timestamp and metadata.event_timestamp.
resource.labels.device_num_id target.resource.product_object_id Directly mapped from resource.labels.device_num_id field.
resource.labels.location target.location.name Directly mapped from resource.labels.location field.
resource.labels.project_id target.resource.name Directly mapped from resource.labels.project_id field.
resource.type target.resource.resource_subtype Directly mapped from resource.type field.
severity security_result.severity Mapped from the severity field based on the following logic:
- If severity is DEFAULT, DEBUG, INFO, or NOTICE, then security_result.severity is set to INFORMATIONAL.
- If severity is WARNING or ERROR, then security_result.severity is set to MEDIUM.
- If severity is CRITICAL, ALERT, or EMERGENCY, then security_result.severity is set to HIGH.
N/A metadata.log_type Hardcoded to GCP_CLOUDIOT.
N/A metadata.vendor_name Hardcoded to Google Cloud Platform.
N/A metadata.event_type Hardcoded to GENERIC_EVENT.
N/A metadata.product_name Hardcoded to GCP_CLOUDIOT.

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