CTF
If we have high privilege access to a domain, we will likely want to establish persistence with high privilege access. One mechanism to do this is to assign ourselves permissions to the adminSDHolder object in active directory:
Here we have the default adminSDHolder permissions. We are going to add our user “low” in here with modify or full control permissions: Read more “Abusing AdminSDHolder to enable a Domain Backdoor”
CTF
Some hashes are obvious but even then, it’s a good job to check. There are a few ways to check a hash outside of manual validation.
Using the Hashcat example list:
https://hashcat.net/wiki/doku.php?id=example_hashes
Using hash-identifier:
https://github.com/blackploit/hash-identifier
Using cyberchef Analyse hash:
https://gchq.github.io/CyberChef/#recipe=Analyse_hash()
Using hash-id:
https://github.com/psypanda/hashID
Using HashTag:
https://github.com/SmeegeSec/HashTag
As you can see there are range of tools available to you, and remember if you want to keep the hashes to yourself you can download Cyberchef and run it locally!
Guides
This is a super-fast blog to show how to crack sshkeys with JohnTheRipper from Kali VM.
Create a key
ssh-keygen Read more “Cracking an SSH key with John the Ripper (JTR)”
Defense
Have you ever wanted to see what would occur in an environment if a worm was a make its way in? I often work with customers to show them about lateral movement from a human operated perspective however sometimes it’s useful for people to visualise this better and to demonstrate what could occur if a worm was set loose. A great tool to help with this is Infection Monkey from Guardicore (https://www.guardicore.com/
The process steps are as follows:
Defense
Ok these are a really simple UAC bypass from a userland GUI perspective. This is about increasing process integrity levels – it’s not about performing LPE from low integrity to high/SYSTEM with no interaction. These clearly work in older version of Windows as well but since Windows 11 will be the current version in the near future I thought it was fun to re-visit these!
And just to be clear, a medium integrity process as an administrator user will have the following privileges:
What we are talking about here is to move to a high integrity process without knowing credentials or having the secure desktop launch. Read more “Windows 11 Privilege Escalation via UAC Bypass (GUI based)”
Defense
“And I looked and behold a pale horse: and his name that sat on him was Death, and Hell followed with him.”
Firstly, Kudos to @j0nh4t for finding this!
I woke up this morning to see twitter fun with a LPE discovered in the Razer driver installation. Basically, when you plug a Razer mouse into a Windows machine, it will download (via windows update) and execute a process as system which has user interaction. This interface includes an install path selector, with this a right click + SHIFT (LULZ) on whitespace will allow you to launch a command prompt/PowerShell window (as SYSTEM).
Guides
Ever needed to test active directory in a hurry? Well, here’s some common commands to test active directory domain services. In this post today we are going to focus on DNS and username enumeration, there are however a range of weaknesses you want to look for:
Port Scanning and Service Fingerprinting
nmap -p- -sC -sV -Pn -v -A -oA ecorp.local.txt 192.168.1.22
Read more “Rapid Active Directory Security Testing of Windows Server 2022 and Kali Linux”
Defense
Windows Remote Management is easy if you are using a domain joined machine and have a CA. But what if you are off the domain and you want to connect to WINRM that has an HTTPS listener? (by default WINRM uses HTTP on TCP 5985, you can clearly chop out the TLS related configs in the example scripts and they will work for plain old WINRM)
This is useful from a sysadmin and penetration testing/red team perspective. Now obviously you could export the certificates and import them into your store, however that’s more work. So, let’s look at how we ignore revocation, CA name and Computer Name checks.
Defense
Recently I decided to do the Red Team Operator: Privilege Escalation in Windows Course by Sektor7 (thanks for the recommendation Justin!). I thought I’d write some notes but also create a quick blog covering some of the Windows fundamental areas. It’s easy to actually forget how this stuff is at a detailed level so figured it helps both myself and the world to share a snippet. I’m litterally listening to the course as I type this, I’ve just imported an OVA to vmware workstation so this is litterally live! (I’m 7 video modules in!)
There’s some key parts around Windows Security Architecture that is important to know, the course does cover this off at the start so I thought I’d share a tiny bit of my notes. Read more “Windows Security Fundamentals & LPE”
Defense
Penetration testing is the activity of conducting security testing with the aim of identifying and exploiting vulnerabilities to identify strengths and weaknesses. I include strengths because I believe it’s important for security testing to promote both positive and negative findings. I also think that there is a huge mis conception with what penetration is, what it helps with and how to best get value from a penetration test.
My definition isn’t too far from the NCSC one: https://www.ncsc.gov.uk/information/check-penetration-testing
A penetration test is a security assurance activity, but it’s one of many activities that I recommend people conduct. This is however largely only adopted by the few, for many a penetration test is a compliance tick box, either from a regulatory or contractual requirement.
When looking at a system a penetration test is not usually the most efficient starting point, especially if it’s from a black box perspective. Read more “Penetration Testing”
