FAQ

Carbon Black EDR (Endpoint Detection and Response) is the new name for the product formerly called CB Response.

Event Bus

Q: How do I set up the Carbon Black server for the event bus?

  1. Edit /etc/cb/cb.conf: add/uncomment the following line:

     DatastoreBroadcastEventTypes=*

  2. Take note of the RabbitMQ configuration in /etc/cb.conf: look for the lines that start with RabbitMQ. You are looking for the following- we will use those shortly to connect to the event bus.

     RabbitMQPort
 RabbitMQUser
 RabbitMQPassword

  3. Add the following to /etc/sysconfig/iptables right below the line with —dport 443 in order to enable communication with the RabbitMQ broker:

     -A INPUT -p tcp -m state --state NEW -m tcp --dport 5004 -j ACCEPT

  4. Restart the cb-enterprise and iptables services

     service iptables restart
 service cb-enterprise restart

At this point, the RabbitMQ broker is available for connections from external clients.

Q: How can I run the example script to pull JSON-formatted events from the event bus?

The Event Forwarder is the most straightforward way to get JSON-formatted events from the event bus.

If you want to develop against the event bus API directly, then you can use the eventBusToJson.py Python script to act as a consumer of the event bus and print out the events in real time as they’re received by the server.

To start, you’ll need a system with Python 2.7 installed. The most straightforward way to run through this is to have a VM or physical machine with CentOS 7 installed. Ensure pip is installed

easy_install pip

Clone the cbapi repository on your local machine and cd into it:

git clone https://github.com/carbonblack/cbapi-python.git
cd cbapi

Install the dependencies

pip install -r server_apis/python/requirements.txt

Run the script

cd server_apis/python/example/bulk
./eventBusToJson.py –u cb –p <RabbitMQPassword> -c https://<CB Server DNS/IP address>

The script will now output JSON structures for every event that’s processed through the CB server on stdout.

Q: What do the events look like once they’re output from the script?

Here is an example event:

{
    "sensor_id": 1,
    "event_type": "childproc",
    "created": true,
    "timestamp": 1435343070,
    "child_process_guid": "00000001-0000-0e0c-01d0-b03d57c1746b",
    "process_guid": 6217766278483900149,
    "type": "ingress.event.childproc",
    "md5": "98FA788238E71D9563D4BF177A4FC22C"
}

Q: Should I use Syslog or the Event Forwarder?

Most syslog servers cannot handle the intense load that we will place on them. For example, just on my test CB server with 2-3 clients, I received multiple errors while testing the script pushing to the local rsyslog daemon on the CB server, such as:

Jun 26 14:21:53 cbtest rsyslogd-2177: imuxsock begins to drop messages from pid 37864 due to rate-limiting

You will also encounter some issues with the size of syslog messages; most syslog servers will silently truncate messages larger than a set size (usually around 500 bytes-1kb). As a result of these issues I would strongly suggest not using syslog as your event queue between CB and your analytics/data storage platform.

Performance

Q: How do I increase the performance of large process/binary queries?

Requesting large numbers of process documents in a single query will cause timeouts, so you will want to request data in smaller batches. The most straightforward way to do this - if you intend to iterate over all results of a query - is to use the process_search_iter helper function. It takes the same arguments as process_search, but returns an iterator of process dictionaries instead. So you could do something like:

for process in process_search_iter(‘mysearch’):
    print process[‘start’], process[‘path’]

Another way to increase the speed of API calls is to disable faceting, if you’re not using that feature. Append the facet_enable=False option to process_search or process_search_iter.


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Last modified on May 5, 2020