This blog post on detecting Mimikatz' DCSync and DCShadow network traffic, accompanies SANS webinar "Detecting DCSync and DCShadow Network Traffic". Intro Mimikatz provides two commands to interact with a Windows Domain Controller and extract or alter data from the Active Directory database. These two commands are dcsync and dcshadow. The dcsync command can be used, … Continue reading Detecting DCSync and DCShadow Network Traffic
Another spin to Gamification: how we used Gather.town to build a (great!) Cyber Security Game
CSI Game hosted on Gather.town platform Let's recap October. Cyber Security Awareness Month. For a cyber awareness enthusiast, it is hard to conceal the excitement that comes with a full month of initiatives in all shapes and sizes, built around a genuine and strong effort to help keep companies and their people “safe online”. At … Continue reading Another spin to Gamification: how we used Gather.town to build a (great!) Cyber Security Game
Cobalt Strike: Using Process Memory To Decrypt Traffic – Part 3
We decrypt Cobalt Strike traffic with cryptographic keys extracted from process memory. This series of blog posts describes different methods to decrypt Cobalt Strike traffic. In part 1 of this series, we revealed private encryption keys found in rogue Cobalt Strike packages. And in part 2, we decrypted Cobalt Strike traffic starting with a private … Continue reading Cobalt Strike: Using Process Memory To Decrypt Traffic – Part 3
Kernel Karnage – Part 2 (Back to Basics)
This week I try to figure out “what makes a driver a driver?” and experiment with writing my own kernel hooks. 1. Windows Kernel Programming 101 In the first part of this internship blog series, we took a look at how EDRs interact with User and Kernel space, and explored a frequently used feature called … Continue reading Kernel Karnage – Part 2 (Back to Basics)
Cobalt Strike: Using Known Private Keys To Decrypt Traffic – Part 2
We decrypt Cobalt Strike traffic using one of 6 private keys we found. In this blog post, we will analyze a Cobalt Strike infection by looking at a full packet capture that was taken during the infection. This analysis includes decryption of the C2 traffic. If you haven't already, we invite you to read part … Continue reading Cobalt Strike: Using Known Private Keys To Decrypt Traffic – Part 2
Automate, automate, automate: Three Ways to Increase the Value from Third Party Risk Management Efforts
Third Party Risk Management (“TPRM”) efforts are often considered labour-intensive, with numerous tedious, manual steps. Often, an equal amount of effort is put into managing the process as is to focusing on risks. In order to avoid this, we’d like to share three ways in which we’ve been boosting our own TPRM efficiency - through … Continue reading Automate, automate, automate: Three Ways to Increase the Value from Third Party Risk Management Efforts
Kernel Karnage – Part 1
I start the first week of my internship in true spooktober fashion as I dive into a daunting subject that’s been scaring me for some time now: The Windows Kernel. 1. KdPrint(“Hello, world!\n”); When I finished my previous internship, which was focused on bypassing Endpoint Detection and Response (EDR) software and Anti-Virus (AV) software from … Continue reading Kernel Karnage – Part 1
Cobalt Strike: Using Known Private Keys To Decrypt Traffic – Part 1
We found 6 private keys for rogue Cobalt Strike software, enabling C2 network traffic decryption. The communication between a Cobalt Strike beacon (client) and a Cobalt Strike team server (C2) is encrypted with AES (even when it takes place over HTTPS). The AES key is generated by the beacon, and communicated to the C2 using … Continue reading Cobalt Strike: Using Known Private Keys To Decrypt Traffic – Part 1
All aboard the internship – whispering past defenses and sailing into kernel space
Previously, we have already published Sander's (@cerbersec) internship testimony. Since this post does not really contain any juicy technical details and Sander has done a terrific job putting together a walkthrough of his process, we thought it would be a waste not to highlight his previous posts again. In Part 1, Sander explains how he … Continue reading All aboard the internship – whispering past defenses and sailing into kernel space
Phish, Phished, Phisher: A Quick Peek Inside a Telegram Harvester
In one of the smaller campaigns we monitored last month (September 2021), the threat actor inadvertently exposed Telegram credentials to their harvester. This opportunity provided us some insight into their operations; a peek behind the curtains we wanted to share.
