Compass Security Blog

Offensive Defense

Make the most out of BloodHound

During internal assessments in Windows environments, we use BloodHound more and more to gather a comprehensive view of the permissions granted to the different Active Directory objects. In this post, we’ll show an advanced usage of this tool by using our additional queries.

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Relaying NTLM authentication over RPC

Since a few years, we – as pentesters – (and probably bad guys as well) make use of NTLM relaying a lot for privilege escalation in Windows networks.

In this article, we propose adding support for the RPC protocol to the already great ntlmrelayx from impacket and explore the new ways of compromise that it offers.

This vulnerability was discovered by Compass Security in January 2020, disclosed to Microsoft Security Response Center and assigned CVE-2020-1113 as identifier.

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Domain-Join Computers the Proper Way

When you add a new computer, it must first join the domain. If you use its future main user to do it, they’ll become the owner and be able to hijack the computer to become a local administrator in four easy steps.

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Challenging Your Forensic Readiness with an Application-Level Ransomware Attack

Ransomware focuses on encrypting data on a filesystem-level, either locally on infected client systems or remotely on accessible file servers. However, what if ransomware would start encrypting data on an application-level too?

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There is such thing as a free lunch

Usually you need to pay for lunches with cash or using your credit card. But in some places employees can pay for a lunch using their access badge. And this is the payment method that will be covered in this blogpost.

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A Smart Card Odyssey

Black box analysis of a not so smart card in ID-1 form factor that is in use for the billing of washing machines and tumble driers.

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enOcean Security

In this post, we are going to take a closer look at the enOcean technology, how security is implemented, and if the security measures and options available are sufficient.

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Windows Forensics with Plaso

Present State of Affairs We have been teaching forensics and network incident analysis for quite a while. We have investigated into a reputable number of cases and we are not the only doing so. Hence, one would expect a certain degree of automation in analysis. However, the high frequency of software release cycles somehow leads […]

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Hidden Inbox Rules in Microsoft Exchange

Contents Introduction Attack Overview Step-by-Step Detection Email Clients Administration Tools Exchange Compliance Features MAPI Editor Eradication Microsoft Security Response Center Swiss Cyber Storm 2018 Conclusion References Introduction In recent investigations, Compass recognized a raise in popularity for attackers to compromise Microsoft Exchange credentials. As one of the first steps after having obtained the credentials (most […]

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No need to break in, use the backdoor

The idea Some time ago I read a tweet about hunting so-called “sticky-keys backdoors”, referencing a presentation at DEFCON 24, https://www.youtube.com/watch?v=EAYtRQKfna0 In addition to the presentation, the team released a tool called “Sticky Keys Slayer” that is publicly available on GitHub, https://github.com/linuz/Sticky-Keys-Slayer/ The sticky-keys backdoor is using a simple trick. On a Windows system, it is possible […]

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