Bright Ideas Blog

Network Visibility

C2 detections, RDP insights and NDR at 100G

Today I am excited to announce Corelight’s v21 release, which delivers dozens of powerful C2 detections, extends analyst visibility around RDP connections, and helps organizations scale network detection and response workloads in high throughput... Read more »

Introducing the C2 Collection and RDP inferences

We’re excited to announce that the Command and Control (C2) Collection is now available with today’s launch of version 21 of the Corelight software. One of the most important ways that defenders can quickly identify and contain a security incident... Read more »

How do you know?

Can you be sure attackers aren’t hiding in your encrypted traffic? Can your investigators go back 18 months ago to find what they need? Do your DNS queries all have responses, and are they what you expected? Do your alerts mean something, or nothing? Read more »

Give me my stats!

I often develop packages for Zeek in cluster mode. In this configuration, it can be difficult to debug your package because it is a continually running environment with real, and often unpredictable, network data. If you add to that other packages... Read more »

Mixed VLAN tags and BPF syntax

This post contains a warning and a solution for anyone using BPF syntax when filtering traffic for network security monitoring.  Read more »

Zeek & Sigma: Fully compatible for cross-SIEM detections

Corelight recently teamed up with SOC Prime, creators of advanced cyber analytics platforms, to add support for the entire Zeek data set into Sigma, the only generic signature language that enables cross-SIEM detections from a single toolset.... Read more »

Chocolate and peanut butter, Zeek and Suricata

Some things just go well together. A privilege of working with very sophisticated defenders in the open source community is seeing the design patterns they use to secure their organizations – both technology and workflows. One of the most common has... Read more »

The light shines even brighter: Updates to Corelight’s Encrypted Traffic Collection

With Corelight’s latest software release, v19, we are excited to announce the expansion of our Encrypted Traffic Collection (ETC). The ETC was introduced in late 2019, but as a reminder it’s a collection of security insights around SSL/TLS and SSH... Read more »

Detecting GnuTLS CVE-2020-13777 using Zeek

CVE-2020-13777 is a high severity issue in GnuTLS. In a nutshell, GnuTLS versions between 3.6.4 (released 2018-09-24) and 3.6.14 (2020-06-03) have a serious bug in their session resumption code, which lets attackers either completely decrypt... Read more »

Watch over DNS traffic with Corelight and Splunk

Corelight sensors put your organization in the best position to watch over DNS traffic with a rich, powerful Network Traffic Analysis (NTA) data set. This article highlights the benefits of Corelight DNS logs, and demonstrates how Splunk Enterprise... Read more »

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