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Reversing and Patching .NET Binaries with Embedded References

Lately I’ve been analyzing a .NET binary that was quite interesting. It was a portable binary that shipped without any third-party dependencies. I started looking at the .NET assembly with ILSpy and noticed that there was not that much code that ILSpy found and there were a lot of references to classes/methods that were neither in the classes identified by ILSpy nor were they part of the .NET framework.

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Yet another edition of BlackHoodie – #BlackHoodie17

I am amazed by how this years BlackHoodie unraveled. Three days that included a pre-conference of lightening talks and two parallel tracks with a total of 64 enthusiastic members. The very spirit of BlackHoodie is nothing other than the quest to gain deep knowledge. Reverse engineering is one of the hardest fields in security. It touches on all fields of computing, starting from assembly, programming, file formats, operating systems, networks and what not. This makes it hard but an extremely fulfilling experience to spend time learning it. For me, the very idea of staring at a binary till you understand what it does is a magical feeling.

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Autonomic Networking – Part 2: Analysis

This is the second part in the Autonomic Network series. We have introduced previously in our first part the Autonomic Network (AN), took a look about the needed configuration to run it on Cisco gear and what is the expected communication flow. In this post, we will dive deeper to have a closer look on the packets and how they are composed. Continue reading “Autonomic Networking – Part 2: Analysis”

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Autonomic Networking – Part 1: Overview

This is a 3-part series which introduces and analyzes Cisco’s implementation for Autonomic Network. In the 1st part, the technology is introduced and we have an overview about communication flow. In the 2nd part, Cisco’s proprietary protocol is reverse engineered 😉 then finally in the 3rd part, multiple vulnerabilities will be disclosed for the first time. If you’re aware of the technology, you can skip directly to part 2 where the action begins!  Continue reading “Autonomic Networking – Part 1: Overview”

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Events

BlackHoodie 2016

This year’s BlackHoodie workshop rolled out with 28 amazing women from all parts of the world. It was a very vibrant group with students, professionals, engineers, researchers, physicists and what not. This is the second year that Marion Marschalek is running this reverse engineering workshop exclusively for women. There were a variety of topics that were covered. This includes anti emulation tricks, anti debuggers, packers, obfuscation, encryption/decryption functions, and a lot of fun with IDA.

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Reverse Engineering With Radare2 – Part 3

Sorry about the larger delay between the previous post and this one, but I was very busy the last weeks.
(And the technology I wanted to show wasn’t completely implemented in radare2, which means that I had to implement it on my own 😉 ). In case you’re new to this series, you’ll find the previous posts here.

As you may already know, we’ll deal with the third challenge today. The purpose for this one is to introduce
some constructs which are often used in real programs.

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Reverse Engineering With Radare2 – Part 2

Welcome back to the radare2 reversing tutorials. If you’ve missed the previous parts, you can find them here and here.

Last time we’ve used the rabin2 application to view the  strings found inside the challenge01 binary to find password candidates. Based on the results we looked into the assembly to find the correct password. In this post, we’ll go through the next challenge and try out some of the features provided by radare2.

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PFX Profiles in Microsoft’s System Management Server

In a recent assessment, we had to evaluate how Microsoft’s System Management Server (SMS) certificate management solution (CMS) stores and handles certificates. This question came up because sensitive, encrypted user certificates were to be stored in the SMS CMS. Due to the sensitivity of the handled certificates, we assessed the protection capabilities of the certificate management solution against extraction attempts from a local attacker with administrative privileges.

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Reverse Engineering With Radare2 – Intro

As some of you may know, there is a “new” reverse engineering toolkit out there which tries to compete with IDA Pro in terms of reverse engineering. I’m talking about radare2, a framework for reversing, patching, debugging and exploiting.

It has large scripting capabilities, runs on all major plattforms (Android, GNU/Linux, [Net|Free|Open]BSD, iOS, OSX, QNX, w32, w64, Solaris, Haiku, FirefoxOS and even on your pebble smartwatch 😉 ) and is free.

Sadly, I had some problems finding good tutorials on how to use it, as the interface is currently a bit cumbersome. After fiddling around, I’ve decided to create a little tutorial series where we can learn together ;). Continue reading “Reverse Engineering With Radare2 – Intro”

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