Note: This is a technical deep-dive into DearCry ransomware. If you want a preliminary analysis of the ransomware, you can find it here. The Network Intelligence team initiated a Static analysis of the ransomware sample we received. The team used a tool called PEstudio, which helps in the static analysis of executable files. Static Analysis […]
Note: We have also done a technical analysis on DearCry. Read here. It’s a warm summer morning. While sipping your morning coffee, you access the work email. But you’re unable to log in. After trying a few tricks you’ve read up in some tech blogs, you reach out to your IT team. They remote log-in […]
Hey, It’s been a busy month for me and I was not able to save time to write the final part of the series on Malware Development. But I am receiving too many DMs on Twitter accounts lately to publish the final part. So here we are. If you are reading this blog, I am […]
Recap In the previous post, we wrote a simple CMD Reverse Shell over TCP. However, in a real-life scenario, things would be pretty different. In this post, we will be focusing on Evading Antivirus and covering the following topics: Creating a Simulated Environment using Windows Active Directory, DNS, Proxy and Firewall. Writing C/C++ code for […]
The Prologue This is my reposting of the blog series I wrote here at ScriptDotSh If you haven’t watched the videos yet, here are my links to both the antivirus evasions I performed: 1. Windows Cloud ML Defender Evasion 2. Kaspersky AV Evasion Besides the above two, I was also able to evade the Symantec […]
Prologue In the previous blogpost, we reverse engineered a binary and extracted the password from within it. This binary however contained a plaintext password. This was good to start for beginners, but you won’t really find such types of binaries in today’s world. In real life, passwords are mostly obfuscated or encrypted. Most of the […]
As you might already be aware that ARM powers a variety of low-powered devices around us, including but not limited to, phones, routers, IoT devices, etc. Therefore, it is only logical to dig into this architecture and understand how it differs from x86 and x64 architectures. For this blog post, we will focus on 64bit […]
Prologue In the previous blog here, we reverse engineered a simple binary containing plaintext password in Linux with the help of GNU Debugger (GDB). In this blog however, we will be using the same source code of the binary but compile and debug it in Windows. Reverse engineering tools in Windows are highly different from […]
Prologue The main focus of this blog is to give a push start to the beginners to get in the field of reverse engineering. Since this is the age of x64, I have skipped x86 architecture and will solely be focusing on x64 assembly. However, all the examples that will be written in C++ can […]
In the previous parts of this blog series, I introduced the concept of writing a full-undetectable malware and about writing a client-side socket using Windows API. In this blog, we are going to parse the reply received from the netcat server and prompt a reply as to whether the command was parsed or not. […]
