Le Zeek, C’est Chic: Using an NSM for Offense

In one of my many former lives (and occasionally in this one) I played "defense", wading through network traffic, logs, etc. for Bad Things™. Outside of the standard FOSS (and even commercial) tools for doing that, I grew to have a real fondness for Zeek, which is often the cornerstone for other network security monitoring (NSM) products and platforms. These days, I use Zeek primarily for NSM purposes and profiling of IoT (and other embedded) devices we at Atredis are either testing or researching.

However, some people may not be aware of the potential for using Zeek in red team or network penetration testing capacities. In this post, I'll touch briefly on Zeek's capabilities and then get into a few examples of using Zeek to help guide/inform testing efforts.