Logs

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 »

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... Read more »

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 »

Having worked on Zeek (Bro) for well over two decades now, it’s hugely gratifying – and frankly still somewhat amazing – to see how widely it is used in today’s enterprises. Zeek’s real-time analysis capabilities, extensible scripting,... Read more »

Last week, a candidate for a senior role at Corelight explained his motivation for joining the company this way: “the world is standardizing on Zeek.” Read more »

In my last post I introduced the idea that analysis of encrypted HTTP traffic requires different analytical models. If you wish to preserve the encryption (and not inspect it via a middlebox), you have to abandon direct inspection of HTTP payloads... Read more »

Welcome to the first in a regular series of blog posts on network security monitoring (NSM). Read more »

One of the first tasks for any incident responder when looking at network logs is to figure out the host names that were associated with an IP address in prior network activity. With Corelight’s 1.15 release we help automate the process and I would... Read more »