A Network Engineer in a Zeek Week World

By Sarah Banks, Senior Director of Product Management, Corelight With almost two decades of networking experience, I recently made my first foray into a security-centric user conference at Zeek Week, an annual conference for the user community of the open source network security monitoring platform known as Zeek (formerly Bro) held last month in Seattle. […]

No Tap? No Problem!

By Richard Bejtlich, Principal Security Strategist, Corelight Recently a fan of network security monitoring (NSM) asked me for advice on his current instrumentation situation. He said his organization was new to NSM and was interested in pursuing solutions with Corelight. However, the company did not have any network taps in place. He wanted to know […]

An attack or just a game? Corelight can help you tell the difference quickly

By Richard Bejtlich, Principal Security Strategist, Corelight When we think about using Corelight data, our mental models often fixate on finding evidence of suspicious and malicious activity. This makes sense, as network security monitoring data generated by Corelight and Zeek combines the granularity of high-fidelity traffic evidence with the compact features of storage-friendly data. However, […]

Don’t Delay – Corelight Today!

By Richard Bejtlich, Principal Security Strategist, Corelight Introduction Recently I heard that a company interested in Corelight was considering delaying their evaluation because of questions about SIEM technology. They currently have two SIEMs and are evaluating a third, possibly to replace the first two. They believed that they needed better clarity about SIEMs as a […]

What did I just see? Detection, Inference, and Identification

By Richard Bejtlich, Principal Security Strategist, Corelight In the course of my network security monitoring work at Corelight, I’ve encountered the terms  detection, inference, and identification. In this post I will examine what these terms mean, and how they can help you describe the work you do when investigating normal, suspicious, and malicious activity in […]

Profiling Whonix

By Richard Bejtlich, Principal Security Strategist, Corelight Introduction This week I read a story announcing that the latest edition of Whonix had been released. I had heard of Whonix, but had never tried it. I knew it was a Linux distribution that tried to make it as easy and safe as possible to anonymize online […]

Bring Network Security Monitoring to the Cloud with Corelight and Amazon VPC Traffic Mirroring

John Gamble, Director of Product Marketing, Corelight Corelight Sensors transform network traffic into comprehensive logs, extracted files, and custom insights via Zeek, a powerful, open-source network security monitoring framework used by thousands of organizations worldwide to accelerate incident response and unlock new threat hunting capabilities. While the sensors we’ve released to date have supported physical […]

Investigating the Effects of TLS 1.3 on Corelight Logs, Part 3

By Richard Bejtlich, Principal Security Strategist, Corelight Introduction Welcome to part 3 of my three-part series on TLS. In the previous two articles I briefly introduced TLS, and showed how Corelight would produce logs for a clear-text HTTP session. I then performed the same transaction using TLS 1.2, and compared the logs with those seen […]

Investigating the Effects of TLS 1.3 on Corelight Logs, Part 2

By Richard Bejtlich, Principal Security Strategist, Corelight Introduction Welcome to part 2 of my three-part series on TLS. In the previous article I briefly introduced TLS, and showed how Corelight would produce logs for a clear-text HTTP session. In this article I will perform the same transaction using TLS 1.2, and compare the logs with […]

Investigating the Effects of TLS 1.3 on Corelight Logs, Part 1

By Richard Bejtlich, Principal Security Strategist, Corelight Introduction I’ve written previously about Corelight data and encryption. I wanted to know how TLS 1.3 would appear in Corelight data, and compare the same network conversation over clear-text HTTP, TLS 1.2, and TLS 1.3. In this first of three parts, I will introduce TLS and demonstrate a […]