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Corelight Bright Ideas Blog

Archives for May 2019

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 »

Network Security Monitoring, a requirement for Managed Service Providers?

Over the last six months, we’ve read in the security press about a variety of managed service providers (MSPs) being compromised by nation-state and criminal actors. Some examples: Read more »

Is there a ‘Z’ in “Vectra”?

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 »

How Zeek can provide insights despite encrypted communications

Overview Encrypted communications are ubiquitous. While encryption provides confidentiality, it cannot prevent all means of traffic analysis. Certain protocols, such as SSH and TLS, ensure contents are not directly readable by monitoring systems.... Read more »

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