Introduction Creating detections can be challenging. There often isn’t a “simple” way to detect something, and once we see an event that seems to correlate with the activity we are looking for, it is easy to become fixated. We create that detection and move on. However, what if other telemetry sources…

It’s dangerous to find malicious services alone! Take this! — Authors: Luke Paine & Jonathan Johnson Introduction This is the second installment of the Defender’s Guide series. In keeping with the theme, we are discussing Windows Services, the underlying technology, common attack vectors, and methods of securing/monitoring them. Services are an important part of the Windows operating system, allowing the control and configuration of long-running processes essential…

Part 2: The Methodology — In part 1 of this series, I touched on how data is the foundation for defensive capabilities and the importance for defenders to understand where and how telemetry is being generated. …

Part 1: TelemetrySource — Data is the foundation by which defense is built upon. This data can come from various telemetry sources — native logging, Endpoint Detection and Response (EDR) tools, network logging, etc. The data from these sources give us insight into activity happening with a given machine — user’s logging in, processes…

Beyond COM — In a previous blog post of mine — WMI Internals Part 2: Reversing a WMI Provider I walked through how the WMI architecture is foundationally built upon COM and in turn how WMI classes can end up invoking COM methods to perform actions. …

Reversing a WMI Provider — In a previous post WMI Internals Part 1: Understanding the Basics I walked through some of the basic internal information behind WMI. …

Written by Jonathan Johnson and Brian Donohue Originally posted: https://redcanary.com/blog/logon-sessions/ Logon sessions can help defenders tell the whole story of everything that happens around, before, and after a suspicious process event. Process telemetry has dominated the detection space since the invention of endpoint detection and response (EDR) tooling. This makes…

Understanding the Basics — Recently I have taken up an interest in WMI internals and thought I would write a blog series on some of my findings. This first release will cover the fundamentals of WMI and how to track back WMI activity to the WMI provider host process (WmiPrvse.exe), the executable responsible for…

A joint blog written by Andrew Schwartz, Charlie Clark, and Jonny Johnson Introduction For the past couple of weeks it has become apparent that Kerberos Relaying has set off to be one of the hottest topics of discussion for the InfoSec community. Although this attack isn’t new and was discovered months…