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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Reversing Bushido IOT botnet by ZullSec

Yet another Linux Botnet sample by the name of Bushido by a group called 0ffsecurity, but this time things are little interesting, the bad actor is not just interested in using compromised IOT device as DOS attack surface but also using compromised web servers. In this post, we will examine how a small infection shell script which leads to the unravelling of dozens of malware. Solving this case also uncovered the hacker group behind this malware.

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