Connect CrowdStrike to SIEM: Splunk, QRadar, Sentinel

Integrating **CrowdStrike Falcon** with a **Security Information and Event Management (SIEM)** solution allows organizations to **centralize threat data, improve security visibility, and enhance incident response**. CrowdStrike Falcon provides **real-time threat detection and endpoint activity logs** that can be forwarded to SIEM platforms like **Splunk, QRadar, ArcSight, and Microsoft Sentinel**.

This guide explains how to integrate **CrowdStrike Falcon with a SIEM solution** using the **Falcon SIEM Connector**.

GitHub Repository: All scripts from this guide are available at github.com/InventiveHQ/crowdstrike-siem-connector-automation. Clone the repo to get started quickly.

Step 1: Prerequisites

Before configuring the integration, ensure you have:
✅ **Admin access to the CrowdStrike Falcon Console**: [https://falcon.crowdstrike.com](https://falcon.crowdstrike.com/) or [https://falcon.us-2.crowdstrike.com/](https://falcon.us-2.crowdstrike.com/) (Varies by tenant).
✅ **SIEM platform installed and configured** (e.g., Splunk, QRadar, ArcSight, Sentinel).
✅ A server or **virtual machine** to host the **Falcon SIEM Connector**.

Step 2: Download and Install the Falcon SIEM Connector

- **Log into the Falcon Console** - Go to **Support** > **Tool Downloads**. - Download the **Falcon SIEM Connector** for your OS (**Windows** or **Linux**).
• Install the SIEM Connector
• On Windows, run the installer and follow the setup wizard.
• On Linux, extract the downloaded file and run

tar -xzf falcon-siem-connector.tar.gz cd falcon-siem-connector sudo ./install.sh

Step 3: Configure the SIEM Connector

- **Open the SIEM Connector Configuration File** - Windows: C:\\Program Files\\CrowdStrike\\SIEMConnector\\config.json - Linux: /etc/crowdstrike-siem/config.json

• Modify the Configuration

• Set the Falcon API credentials (from Falcon Console).

• Define the SIEM event format (Splunk, JSON, CEF, Syslog).

• Configure the log forwarding settings.

• Example JSON Configuration for SIEM Outputj

{ "falcon_api": { "client_id": "YOUR_CLIENT_ID", "client_secret": "YOUR_CLIENT_SECRET" }, "output": { "format": "json", "destination": "syslog://your.siem.server:514" }
}

- Save and Exit the Configuration File.

Step 4: Start and Verify the SIEM Connector

• Windows
  Open Command Prompt as Administrator and run

net start CrowdStrikeSIEMConnector

• Linux
  Start the SIEM connector using:

sudo systemctl start crowdstrike-siem

• Verify Connectivity
  Check if logs are being forwarded to your SIEM by running:

tail -f /var/log/crowdstrike-siem.log

Step 5: Validate Data in the SIEM

- Log into your **SIEM solution** (e.g., Splunk, QRadar, ArcSight). - Search for CrowdStrike Falcon events:
• Splunk Query:

index=crowdstrike

- **QRadar AQL Query:**

SELECT * FROM events WHERE LOG_SOURCE='CrowdStrike Falcon'

- **ArcSight Query**:

deviceVendor='CrowdStrike' AND deviceProduct='Falcon'

- Verify that CrowdStrike logs are appearing in real-time.

Best Practices for SIEM Integration

✅ **Enable Only Relevant Event Types** – Avoid overwhelming your SIEM with unnecessary data.
✅ **Use a Dedicated Log Server** – Improve performance by forwarding logs to an intermediary before the SIEM.
✅ **Regularly Review SIEM Dashboards** – Ensure Falcon threat intelligence is being utilized effectively.