Binary Exploitation - (Level 4) flag

Challenge Description

Papa brought me a packed present! let’s open it. Download. This is reversing task. all you need is binary

From the description seems like it is a reverse engineering task. Let’s download the binary and load it up in ghidra.

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Binary Exploitation - (Level 3) BOF

Challenge Description

Nana told me that buffer overflow is one of the most common software vulnerability. Is that true?

This challenge is a classic buffer overflow but to interact with the program we have to connect to the remote server, and this simple challenge is a very good example of remote exploitation.

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Testing Linux Heap exploits on different Glibc version (with source-level debugging setup)

Recently I am learning about Linux Heap exploitation and I came across some really good Phrack papers and blogs which explained different type of attacks in varying conditions, I have included the link of these blogs and papers in the next section. I also came across an amazing GitHub project How2Heap by shellpish team, this project has the example exploit code for various heap exploitation technique of different versions of Glibc out there in public, which help me to get a better understanding of how those attacks played out. That project also included a script to build Glibc with any version of your choice and test the exploit on that version.

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Analyzing the Windows LNK file attack method

Recently a friend of mine shared an interesting Malicious sample, it was a Microsoft shortcut file (LNK file) which after clicking(execution) lead to infection, although I was not aware of this type of attack vector before doing a basic research on google I was surprised that there is an increase in this type of attacks since 2017. In this post we will Analysis the LNK file malware and uncover how attacker uses multiple layers of obfuscation to evade AV and finally dropping malicious binary, we will also look into how to de-obfuscate each layer and understand what the code is doing.

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Unpacking Grey Energy malware (Service Application DLL)

Recently I stumbled upon malware sample which was part of Grey Energy malware campaign targeting Ukraine energy infrastructure. I ran the hash of the file on virutotal and many of the antiviruses tagged it Grey Energy and I tried to do a little more internet research but didn’t find and analysis on it. As there was no post on this sample so I decided to write one.
In the post you will learn the following:

  1. How to debug Windows Service Application DLL
  2. Learn how to use a EBFE debugging technique
  3. Unpacking a DLL binary
  4. How to dump an unpacked in-memory executable

File hash : 15a6f734ca79efc027000dd12f4d3870ccc9f604517b0e700c05b961659308d1

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Gandcrab v5.0.3 detail analysis of javascript delivery payload

Recently a friend of mine shared with me a Javascript file which on execution resulted in machine been infected by GandCrab ransomeware. Initial through was that it must be the Javascript implementation of ransomeware, but assumption tuned out to be wrong, the code was actually heavily obfuscated and it dropped the actual GandCrab binary (v5.0.3) which did the encryption. The Javascript code did lots of other technology like using Powershell script and ActiveXObject in order to evade detection.

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