Collect LimaCharlie EDR logs

This document explains how to ingest the LimaCharlie EDR logs to Google Security Operations using Google Cloud Storage. The parser extracts events from JSON formatted logs, normalizes fields into the UDM, and handles both top-level and nested events. It specifically parses various event types, including DNS requests, process creation, file modifications, network connections, and registry changes, mapping relevant fields to their UDM equivalents and enriching the data with LimaCharlie specific context.

Before you begin

Ensure that you have the following prerequisites:

• Google SecOps instance
• Privileged access to Google Cloud
• Privileged access to LimaCharlie

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:

      • Enter a unique name that meets the bucket name requirements (for example, cloudrun-logs).
      • 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.
      • To add a bucket label, click the expander arrow to expand the Labels section.
      • 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:

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

   1. In the Choose how to protect object data section, do the following:
      • Select any of the options under Data protection that you want to set for your bucket.
      • To choose how your object data will be encrypted, click the Data encryption expander arrow, and then select a Data encryption method.

5. Click Create.

Configure Log Export in LimaCharlie EDR

1. Sign in to the LimaCharlie portal.
2. Select Outputs from the left menu.
3. Click Add Output.
4. Choose output stream: Select Events.
5. Choose output destination: Select Google Cloud Storage.
6. Provide the following configuration details:
   • Bucket: Path to the Google Cloud Storage bucket.
   • Secret Key: Secret json key identifying a service account.
   • Sec per File: Number of seconds after which a file is cut and uploaded.
   • Compression: Set to False.
   • Indexing: Set to False.
   • Dir: Directory prefix where to output the files on the remote host.
7. Click Save output.

Configure a feed in Google SecOps to ingest LimaCharlie EDR logs

1. Go to SIEM Settings > Feeds.
2. Click Add new.
3. In the Feed name field, enter a name for the feed (for example, Limacharlie EDR Logs).
4. Select Google Cloud Storage as the Source type.
5. Select LimaCharlie as the Log type.
6. Click Get Service Account as the Chronicle Service Account.
7. Click Next.

8. Specify values for the following input parameters:

   • Storage Bucket URI: Google Cloud Storage bucket URL in gs://my-bucket/<value> format.
   • URI Is A: Select Directory which includes subdirectories.
   • Source deletion options: Select deletion option according to your preference.
   • Asset namespace: The asset namespace.
   • Ingestion labels: The label applied to the events from this feed.

9. Click Next.

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

UDM mapping table

Need more help? Get answers from Community members and Google SecOps professionals.