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          Richard Bejtlich

          Using Corelight to monitor and identify exploited VPNs

          Network and security infrastructure, such as routers, switches, firewalls, virtual private network concentrators, and other equipment, are designed to provide a stable and secure communications experience for client and server computers and their... Read more »

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

          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... Read more »

          A conversation with GE’s former CIO on three keys to CIRT success

          Earlier this month during Black Hat I had the good fortune to speak with Gary Reiner, a business leader for whom I have an immense amount of respect. Gary was the chief information officer (CIO) at General Electric (GE) for 20 years, and as such he... Read more »

          Don’t delay – Corelight today!

          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.... Read more »

          What did I just see? Detection, inference, and identification

          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... Read more »

          Profiling Whonix

          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... Read more »

          Investigating the effects of TLS 1.3 on Corelight logs, part 3

          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... Read more »

          Investigating the effects of TLS 1.3 on Corelight logs, part 2

          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... Read more »

          Investigating the effects of TLS 1.3 on Corelight logs, part 1

          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... Read more »

          How to use Corelight and Zeek logs to mitigate RDS/RDP vulnerabilities

          Introduction On May 14 Microsoft released patches for, and details about, a remote code execution vulnerability in Remote Desktop Services (RDS), the graphical interactive desktop offered with most Windows operating system platforms. This... Read more »

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