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A computer that can run a Windows virtual machine. An interest in disassembling things and understanding how they work! Basic assembly knowledge about common instructions, registers, conditional branches Basic programming knowledge and ability to understand simple Python and C source codeCourse Duration: 1 Hours
Course Instructor: Cristina Gheorghisan
Hello and welcome to our Advanced Reverse Engineering Ransomware class!
This course is a continuation of our first class, Reverse Engineering Malware, but don’t worry, that is not a pre-requisite. You can start with this course and just dive in. However, if you feel like starting from the basics, we encourage you to check it out!
The aim of this course is to provide a practical approach to analysing ransomware. More specifically, we will attack the following topics:
Identify and work around anti-virtualisation techniques deployed inside malware samples
Dynamic analysis of sample’s activity on a Windows box
Advanced debugging techniques
Use static analysis to discover and understand encryption algorithms
Discover, and work-around, obfuscation tricks and anti-static analysis tricks
Discover flaws that allow us to recover encrypted files
Write decryptors in Python and C
The course begins by going through the necessary precaution measures when working with malware, then quickly dives in analysing actual samples. Since Windows is by far the most popular target platform, we will focus on this operating system.
Neither professional programming experience nor assembly language knowledge are required to benefit from the course, although they would be very helpful when we’ll look at identifying encryption algorithms and bypass anti-virtualisation checks. The concepts will be explained in a clear and concise manner and additional resources will be recommended.
Some programming experience will be very beneficial when we’ll start writing decryptors. However, the focus will be mostly on understanding the algorithms and specifically what information we need to do successful decryptions. For this reason, full Python and C source code will be provided.
To get the most out of this course, we recommended to exercise all the steps described within the lectures and whenever a concept or idea is not fully explained or clearly understood, either reached out with questions on the Q&A section or consult online resources.
Why take this course?
Mostly because you like a practical malware analysis course focused on a real threat – ransomware. Also because you’re curious how ransomware are reversed by people or companies that routinely write public decryptors.
This course intention is to be useful and interesting to everybody involved in information security and malware analysis, from students to security testers and forensic investigators.
If you decide you love reverse engineering and wish to further develop your skills, other resources will be suggested along the way.
The course will explain how to use process monitoring tools, hex editors, debuggers and disassemblers.
A lot of the concepts and analysis strategies presented here apply to analysing malware in general.
Once you have completed this training course, you will be more confident and capable to identify anti-virtualisation and anti-static analysis tricks.
You will also be able to debug your samples in any debugger and disassembler.
You will be able to identify encryption algorithms and write decryptors for your own samples.
Samples and scripts are included, so you can follow along with us throughout the lessons. IDA scripts, Python and C source code is provided for various tasks needed throughout the class.
Who is this course for?
This course is for anyone interested in information security in general and malware analysis in particular, including but not only:
Security testersMalware analystsForensics investigatorsSystem administratorsInformation security students
Who this is not?
This course is not an introduction to malware. It only focuses on the sub-topic of ransomware.
Basic experience with assembly and programming languages will be very helpful, because this is not an introduction to assembly.
Although safety issues are presented, this is not a tutorial on how to configure a malware analysis virtual environment.
Although general information is presented, this is not an elaborate high-level description of ransomware.
Solutions for attempting to reverse the encryption process and recover files are presented, but this is not a course about how to prevent ransomware in the first place.
Basic familiarity with reverse engineering concepts would be very useful, because this is not an introduction to reverse engineering.
Although it should be obvious, this is not a tutorial on how to write better ransomware.
What am I going to get?
The lectures, videos and other resources will provide you with relevant information about current malware analysis tricks
You will learn how to confidently use any debugger and disassemblerYou will learn to identify flaws in the ransomware code or encryption logicYou will learn how to write scripts for IDA ProYou will get a relevant quiz at the end to test your understandingPython and C source code for the decryptors and IDA scripts
Minimum requirements :
At minimum, you will have:A computer that can run a Windows virtual machine.An interest in disassembling things and understanding how they work!Basic assembly knowledge about common instructions, registers, conditional branchesBasic programming knowledge and ability to understand simple Python and C source code
Patience and a lot of perseverance to “try harder” ®
Who this course is for:
Information security students