Cyber Security for PC Gamers

Introduction

The other day there was a lot of focus on “ATLASOS” a rather oddly branded project, just to be clear:

ATLASOS is NOT AN Operating System (OS) (despite it’s name!)

ATLASOS (at the time of writing) disables basically the majority of Windows Security features including:

Defender
Smart Screen
Windows Update
Spectre/Meltdown Mitigations

Basically, if you can think of “nightmare” in the cyber world, ATLASOS’s security posture is basically that (in my opinion)! That said, it’s cool from a nerd Windows customization/build pov, however based on my initial investigations I would strong recommend NOT using it on a “PRODUCTION” system (or anything that’s connected to the internet!).

Active Directory Security Cheat Sheet

Ok you need to do some AD Security Auditing or Security Testing/Exploitation, great. Let’s look at some of the common misconfigurations and some tools to help you, a list of things will obviously not be the answer, you will need a method and process to go through from recon/enumeration through to exploitation and impact (effects), but that’s what google is for (and CTFs/Labs)! This post is just me jotting down some notes, hopefully they help defenders think about improving their posture.

Hunting for New Group Policies Where Scheduled Tasks are…

A common way to deploy an encryption routine used in Ransomware scenarios is to create a scheduled task to launch a cyptor exe. This is commonly deployed via a Group Policy Object (GPO).

So I wanted to look at how with Microsoft Defender for Endpoint (MDE) we could detect this both on domain controllers but also on CLIENT devices (MEMBER SERVERS/PCs)

Malicious Scheduled Tasks

A very common technique in ransomware scenarios is the deployment of Scheduled Tasks via Group Policy object.

So I thought I’d start to post some content around this. To start with I was looking locally to enable the following:

“Show me all the command lines used in scheduled tasks on Windows with PowerShell”

So I knocked up this really simple proof of concept (there are other ways to write this obvs)

Living with your password strength head in the sand

Password audits, if you ask some security pros you will hear a million reasons why you would be insane to do them… ask me however and the answer is more nuanced. They are activities that must be handled with the upmost care, however…. they (in my experience) have been incredibly useful to help improve security postures and to enable organisations to understand risk! You are of course free to ignore what I think and live like an ostrich (or it really might not be suitable for your environment). I’m not going to talk about how to do a password audit today, I’m also not going to advise in this post on sourcing strategy (you may want to do in house or you might want to outsource, after all, you normally put all your hashes in someone else’s computer when you use cloud right!?), anyway enough rambling, year ago the NCSC UK did some password auditing research (it was good work – Spray you, spray me: defending against password spraying… – NCSC.GOV.UK) and now the DOI have also done similar, check out the report In the link below:

Log4Shell exploitation and hunting on VMware Horizon (CVE-2021-44228)

TLDR

Go and run this on the connection servers:

https://github.com/mr-r3b00t/CVE-2021-44228

It’s crude so also look for the modified timestamps, recent unexpected blast service restarts and if you have process logging go and check for suspicious child processes over the period. Once you have checked, run a backup, then if they aren’t patched, patch the servers! (i know patching isn’t as simple as just patch!)

Secure Service Design: Practical Solution Architecture

The truth shall set you free

I’ve worked in technology a long time now (relatively for me). It’s now over 20 years professionally and when I was a kid, I used to remove malware from small business’s etc. I’ve travelled to some funky places and done some cool things, but I learn new things every day. I do however come across some repeating patterns in my adventures as a consultant. There is a hidden truth that many are scared to admit…

Most organisations are not very good at service design, let alone secure service design!

Ok so there it is, I hope that this blog doesn’t age very well, but I’m 20 years in and I chat with my dad about his past life in the corporate world and we both see the same things being repeated. So, what can we do about it? Well sharing is caring, so here’s some things to think about when planning and designing a new service. I’m going to focus on the technology and security aspects, clearly, I am not saying ignore the business and value alignment but for the purposes of this post I’m assuming that the functional service capabilities and alignment are in effect. I’m also assuming that business case is solid because you know, without £ it’s a bit hard to create an operate a service (that’s a whole new post!). Read more “Secure Service Design: Practical Solution Architecture” →

Everything must be agile but is that really always…

A lot of people talk about AGILE but the normally mean ‘agile’ however when it comes to security testing and penetration testing (to me there is most certainly a difference) we need to be mindful of the different approaches, so we select the right one for the context, scenario, and objectives.

In this post we take a brief look at what we recommend for a range of scenarios and we look at the key differences and what some constraints might mean when it comes to approach selection.

Make Logging Great Again (MLGA)

Ok so i’ve been showing how alot of things do NOT get audited in Windows out of the box (on Twitter obviously) so I thought I’d export the CSV which you can import to enable some of the advanced logging features into a GPO without so many clicks (RSA sucks!)

So here is a CSV file that you can use to import! this isn’t everything you need to do, but it’s a start!

Hunting a breach… CVE-2020-5902

I’ve spent the last 24 hours (including a sleeps) gathering intel, testing in the lab and looking at what the path traversal and RCE for the F5 BIG-IP as outlined in CVE-2020-5902 looks like.
Well I’ll be honest.. the whole scenario is a bit of a bloody mess! We’ve got people leaving management interfaces exposed to the internet, we’ve got a vulnerability that’s incredibly old in a security appliance (it’s not exactly uber 1337 either) and we’ve had the release scenario that’s probably ruined peoples weekends and weeks (I’m not going into an Offensive Securitry Tools debate/argument, if you want that go talk to a brick wall or someone else!)