Blog – Page 4 – PwnDefend

Technology in the Wild

Whilst every marketing person will talk about the latest and greatest tech innovation and product, how much does that reflect the reality of technology deployed in the world? Everyone is running Windows 11 and Windows Server 2022 right?! They also don’t use computers, because everything is cloud and mobile first right! and security, well everyone has that down as well! Great… let’s just go and check those statements out… oh wait…. no maybe err.. let’s take a look with our friends at shodan.io

Hacking

CrackMapExec (CME) on Windows

Ok this is going to be really short post, but expect more later! Did you ever want to run CME but you were stuck on a Windows machine? Well don’t worry you can! How do we do this?

First we download CME

https://github.com/Porchetta-Industries/CrackMapExec/releases/download/v5.4.0/cme-windows-latest-3.10.1.zip

Extract the zip file

Make sure you have python3 installed!

Guides

Ransomware + Mega = Mega Cyber Pain

Did you ever read about ransomware actors? They often use mega upload to exfiltrate data! So I figured, why would we not detect this with MDE?

I mean sure we should probably block this with a custom indicator using Web Content Filtering and sure it would probably get blocked by Protective DNS but let’s say for whatever reason you don’t have those in place, let’s look at a really simple query to find mega connections in MDE:

Defence

Threat hunting with some funny results!

You never know what you will find when you go hunting! So here’s a quick tale of an explore I did using Advanced Hunting!

I went hunting here in Advanced Hunting:

Threat Intel

Simulating Human Operated Discovery

Did you want to check out some of your detections? This isn’t everything of course but it’s a simple batch file to simulate a range of enumeration techniques used by actors like CONTI or LOCKBIT affiliates/operators:

Uncategorized

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)

Uncategorized

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)

Guides

Volume Shadow Copy

If you are having fun today with Defender ASR deleting lnk files then you will see the MS Script has a v1.1 which looks to VSS to see if it can restore shortcuts from shadow copies, so whilst here I thought I’d note down a few different ways to list the Volume Shadow Copies.

You will need admin rights for these to work:

Leadership

It’s 2023 and people’s passwords are still really really…

If you work in marketing you are probably walking around telling everyone that we all live in a ZERO trust era, that PASSWORDS are DEAD! Ransomware is DEAD and AI is the FUTURE and we should be doing that NOW!

Meanwhile back on CYBER PLANET EARTH, most organisation do NOT have or need AI, they use passwords and well they passwords they use are shockingly bad! Howe do I know this? I do password audits and security testing, but I also look at breach data! (and we have other people publish password audit reports etc.)

Uncategorized

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: