7MS #449: DIY Pentest Dropbox Tips - Part 3
7 Minute Security7 Tammi 2021

7MS #449: DIY Pentest Dropbox Tips - Part 3

Happy new year! This episode continues our series on DIY pentest dropboxes with a focus on automation - specifically as it relates to automating the build of Windows 10, Windows Server 2019, Kali and Ubuntu VMs. Here's the resources I talk about in more detail on today's episode that helps make the automagic happen:

Windows VMs
This article from Windowscentral.com does a great job of walking you through building a Windows 10 unattended install. A key piece of the automation is the autounattend.xml file, which you can somewhat automatically build here, but I think you'll want to install the Windows System Image Manager to really get in the tech weeds and fully tweak that answer file. The handy AnyBurn utility will help you make ISOs out of your Windows 10 / Server 2019 customized builds.

Ubuntu VMs
I set out to build a Ubuntu 18.x box because Splashtop only supports a few Linux builds. I found a freakin' sweet project called Linux unattended installation that helps you build the preseed.cfg file (kind of like the Windows equivalent of an answer file). The area of preseed.cfg I've been spending hours dorking around with is:

d-i preseed/late_command string \

Under this section you can customize things to your heart's content. For example, you could automatically pull down and install all OS packages/updates and a bunch of third party utils you want:

in-target sh -c 'apt-get update'; \ in-target sh -c 'apt-get upgrade -y'; \ in-target sh -c 'apt-get install curl dnsrecon git net-tools nmap openssh-server open-vm-tools-desktop python3.8 python3-pip python-libpcap ubuntu-gnome-desktop unzip wget xsltproc -y'; \

Finally, the project provides a slick script that will wrap up your Ubuntu build plus an SSH key into a ready-to-go ISO:

build-iso.sh ~/.ssh/id_rsa.pub ~/Desktop/My-kool-kustomized-Ubuntu.iso

Awesome!

Kali VMs
There is some decent documentation on building a preseed.cfg file for Kali. But the best resource I found with some excellent prebuilt config file is this kali-preseed project.

Once your seed file is built, it's super easy to simply host it on a machine in your network and let Kali pull it during install. For example, if you've got a Linux box with Python on the network at 192.168.0.7, just make a temporary folder with the preseed.cfg file in it and then run:

sudo python3 -m http.server 80

Then, in your virtual environment, create a new VM and boot it to a Kali NetInstaller image. At the splash screen, hit Tab and it'll display a command line you can edit. Remove the line that says something like preseed/file=/cdrom/simple-cdd/default.preseed, add auto=true and then the URL path to your preseed file, such as url=http://192.168.0.7/preseed.cfg. The Kali will ask for a few questions, such as a username and hostname to configure, and then if you're watching your machine hosting preseed.cfg, you'll see your Kali machine grab the config file and take care of the rest from there!

Got a better/cooler/funner/faster/awesomer way to do this type of automation? Let us know!

Jaksot(682)

7MS #643: DIY Pentest Dropbox Tips – Part 11

7MS #643: DIY Pentest Dropbox Tips – Part 11

Today we continue where we left off in episode 641, but this time talking about how to automatically deploy and install a Ubuntu-based dropbox!  I also share some love for exegol as an all-in-one Active Directory pentesting platform.

27 Syys 202426min

7MS #642: Interview with Ron Cole of Immersive Labs

7MS #642: Interview with Ron Cole of Immersive Labs

Ron Cole of Immersive Labs joins us to talk pentest war stories, essential skills he learned while serving on a SOC, and the various pentest training and range platforms you can use to sharpen your security skills! Here are the links Ron shared during our discussion: VetSec Fortinet Veterans Program Immersive Labs Cyber Million FedVTE

23 Syys 202442min

7MS #641: DIY Pentest Dropbox Tips – Part 10

7MS #641: DIY Pentest Dropbox Tips – Part 10

Today we’re revisiting the fun world of automating pentest dropboxes using Proxmox, Ansible, Cursor and Level.  Plus, a tease about how all this talk about automation is getting us excited for a long-term project: creating a free/community edition of Light Pentest LITE training!

13 Syys 202427min

7MS #640: Tales of Pentest Pwnage – Part 63

7MS #640: Tales of Pentest Pwnage – Part 63

This was my favorite pentest tale of pwnage to date!  There’s a lot to cover in this episode so I’m going to try and bullet out the TLDR version here: Sprinkled farmer files around the environment Found high-priv boxes with WebClient enabled Added “ghost” machine to the Active Directory (we’ll call it GHOSTY) RBCD attack to be able to impersonate a domain admin using the CIFS/SMB service against the victim system where some higher-priv users were sitting Use net.py to add myself to local admin on the victim host Find a vulnerable service to hijack and have run an evil, TGT-gathering Rubeus.exe – found that Credential Guard was cramping my style! Pulled the TGT from a host not protected with Credential Guard Figured out the stolen user’s account has some “write” privileges to a domain controller Use rbcd.py to delegate from GHOSTY and to the domain controller Request a TGT for GHOSTY Use getST.py to impersonate CIFS using a domain admin account on the domain controller (important thing here was to specify the DC by its FQDN, not just hostname) Final move: use the domain admin ccache file to leverage net.py and add myself to the Active Directory Administrators group

7 Syys 202443min

7MS #639: Tales of Pentest Pwnage - Part 62

7MS #639: Tales of Pentest Pwnage - Part 62

Today’s tale of pentest pwnage talks about the dark powers of the net.py script from impacket.

3 Syys 20247min

7MS #638: Tales of Pentest Pwnage – Part 61

7MS #638: Tales of Pentest Pwnage – Part 61

Today we’re talking pentesting – specifically some mini gems that can help you escalate local/domain/SQL privileges: Check the C: drive! If you get local admin and the system itself looks boring, check root of C – might have some interesting scripts or folders with tools that have creds in them. Also look at Look at Get-ScheduledTasks Find ids and passwords easily in Snaffler output with this Snaffler cleaner script There’s a ton of gold to (potentially) be found in SQL servers – check out my notes on using PowerUpSQL to find misconfigs and agent jobs you might able to abuse!

23 Elo 202432min

7MS #637: BPATTY[RELOADED] Release Party

7MS #637: BPATTY[RELOADED] Release Party

Hello friends, I’m excited to release BPATTY[RELOADED] into the world at https://bpatty.rocks! – which stands for Brian’s Pentesting and Technical Tips for You! It’s a knowledge base of IT and security bits that help me do a better job doing security stuff! Today I do an ACTUAL 7-minute episode (GASP…what a concept!) covering my favorite bits on the site so far. Enjoy!

17 Elo 20247min

7MS #636: A Prelude to BPATTY(RELOADED)

7MS #636: A Prelude to BPATTY(RELOADED)

Artificial hype alert!  I’m working on a NEW version of BPATTY (Brian’s Pentesting and Technical Tips for You), but it is delayed because of a weird domain name hostage negotiation situation.  It’s weird.  But in the meantime I want to talk about the project (which is a pentest documentation library built on Docusaurus) and how I think it will be bigger/better/stronger/faster/cooler than BPATTY v1 (which is now in archive/read-only mode).

12 Elo 202411min

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