I Wanna Go Fast, Really Fast, like (Kerberos) FAST

September 20, 2022

1    Introduction At TrustedSec, we weigh an information security program’s ability to defend against a single specified attack by measuring detection, deflection, and deterrence. Now while a majority of my blog posts have been concentrated around detection this post is more ‘deterrence’ focused. I first heard about Kerberos FAST from Steve Syfuhs (@SteveSyfuhs) of Microsoft…

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A Diamond in the Ruff

July 5, 2022

This blog post was co-authored with Charlie Clark at Semperis 1.1      Background of the ‘Diamond’ Attack One day, while browsing YouTube, we came across an older presentation from Blackhat 2015 by Tal Be’ery and Michael Cherny. In their talk, and subsequent brief, WATCHING THE WATCHDOG: PROTECTING KERBEROS AUTHENTICATION WITH NETWORK MONITORING, they outlined something we…

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WMI Providers for Script Kiddies

June 9, 2022

Introduction So, this WMI stuff seems legit. Admins get a powerful tool which Script Kiddies can also use for profit. But there’s gotta be more, right? What if I want to take my WMI-fu to the next level? In the previous blog post, “WMI for Script Kiddies,” we described Windows Management Instrumentation (WMI). We detailed…

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ELFLoader: Another In Memory Loader Post

May 4, 2022

Intro Now that BOFs are commonplace for Windows agents, some people have talked about wanting a non-Windows only version. In this blog post, we’ve got something for you: the same thing but for Linux/Mac. The process of building in memory loaders are the same, no matter the file format type. In this case, we’ll just…

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g_CiOptions in a Virtualized World

May 2, 2022

With the leaking of code signing certificates and exploits for vulnerable drivers becoming common occurrences, adversaries are adopting the kernel as their new playground. And with Microsoft making technologies like Virtualization Based Security (VBS) and Hypervisor Code Integrity (HVCI) available, I wanted to take some time to understand just how vulnerable endpoints are when faced…

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WMI for Script Kiddies

January 20, 2022

Introduction Let’s say an ‘Administrator’ lands on a target network host and wants to look around and ‘administer’ the system without uploading any new tools… How can I do that without burning any of my Script Kiddie tools? WMI or Windows Management Instrumentation or Windows Managed Infrastructure is an interface for managed components that provides…

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Supply Chain Woes – Attacks and Issues in IT Infrastructure: What Can We Do?

September 21, 2021

All businesses operate on the principle that a certain level of trust is necessary between the business itself and the IT components that comprise its supporting infrastructure. These components include hardware and software, as well as the vendors who provide services to the infrastructure. Securing a business supply chain is a big challenge, not only…

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Obsidian, Taming a Collective Consciousness

September 7, 2021

The Problem On August 05, 2021, a member of the Conti ransomware group leaked some of the group’s internal playbooks and technical documentation. Irrespective of any details surrounding the leak or its contents, the event itself prompted a more widespread examination of how teams’ maintain their operational playbooks and documentation. A tweet by Mubix came…

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Oh, Behave! Figuring Out User Behavior

August 19, 2021

One topic that has always been of interest to me is how users actually use their computers. While TrustedSec does have the ability to understand a system when we encounter it, there are still mysteries around normal user behavior. Understanding user behavior becomes even more important when attempting to defeat next generation of EDRs that…

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BITS Persistence for Script Kiddies

June 29, 2021

Introduction Using and abusing the BITS service is a lot of fun. I can’t believe Windows just gives away this hacker tool for free. But wait, wait, are you telling me that there’s more? Does it come with a free blender? What else can this service do for me? In the last installment, we covered…

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