The saying “data is king” has been around for quite a while and we all know that the world operates and makes decisions on digital data 24x7x365. But, is data king in the field of cybersecurity? I believe that evidence - not data - is what is needed to speed defenders’ knowledge and response capabilities, so let's talk about both.

Evidence is the currency cyber defenders use to pay down security debt, balancing the value equation between adversaries and the enterprise. Defenders can use evidence proactively, identifying and protecting structural risks within our zone of control. Evidence can also be used reactively by supporting detection (re)engineering, response, and recovery activities, guiding us back to identifying and protecting structural risks.

In this post, we show how enriching Zeek® logs with cloud and container context makes it much faster to tie interesting activity to the container or cloud asset involved.In cloud or container environments, layer 3 networking is abstracted away from the higher-level tasks of running workloads or presenting data. Because of this abstraction, when Zeek logs are collected for cloud or container network environments, the attribution of a network flow to actual workload or application is difficult.

This month, Microsoft announced a vulnerability in NFS. The exploit lies in how an attacker can force a victim NFS server to request an address from the attacker’s fake NFS server. The address returned will overflow memory on the victim NFS server and cause a crash. Through Microsoft’s MAPP program, Corelight Labs reviewed a proof-of-concept exploit for this vulnerability and wrote a Zeek®-based detection for it. You can find a PCAP of this exploit in our GitHub repository.