7MS #441: SharpGPOAbuse
7 Minute Security15 Marras 2020

7MS #441: SharpGPOAbuse

Hello friends! Sorry to be late with this episode (again) but we've been heads-down in a lot of cool security work, coming up for air when we can! Today's episode features:

  • A little welcome music that is not the usual scatting of gibberish I torture you with

  • Some cool tools I'm playing with in the lab that we'll do future episodes on in the future:

    • DetectionLab to practice detecting all the bad things!
    • BadBlood to dirty up your AD (your test AD with groups, computers, permissions, etc.). I wish the user import script would let you choose a list of bad passwords to assign the users, but you can also run it manually if you want.
    • Cobalt Strike - we're doing a demo right now!

Most of today's episode focuses on SharpGPOAbuse, a tool that can be used to abuse "generic write" access to GPOs (which you might identify after running BloodHound). Here's a sample syntax you could run:

SharpGPOAbuse.exe --AddUserTask --TaskName "Totes Safe Windoze Updatez" --Author SAMPLECO\ADMINISTRATOR --Command "cmd.exe" --Arguments "/c net group \"Domain Admins\" SomeLowPrivUser /ADD DOMAIN" --GPOName "Name of GPO with Generic Write Access"

This will push a ScheduledTasks.xml file to \\sample.company\Policies\LONG-STRING-REPRESENTING-THE-GPO-ID\User\Preferences\ScheduledTasks

Now if you find that the task is not pushing correctly, it may be that SharpGPOAbuse.exe hasn't been able to update either the GPT.INI file (in the root of the GPO path) and/or the versionNumber value assigned to the GPO itself.
If you need to adjust the versionNumber and GPT.INI value manually, definitely read this Microsoft article so you know how the number is generated and how to increment it properly. This flippin' sweet RastaMouse blog article also helped this click for me.

If you can't seem to update versionNumber using the PowerShell in Rasta's article, you can also open up ADSI Edit and navigate to Default naming context > DC=your,DC=com > CN=System > CN=Policies > CN=LONG-STRING-REPRESENTING-THE-GPO-ID then get the properties of the folder, scroll down and manually adjust the value for versionNumber.

Jaksot(703)

7MS #679: Tales of Pentest Pwnage – Part 73

7MS #679: Tales of Pentest Pwnage – Part 73

In today's tale of pentest pwnage I talk about a cool ADCS ESC3 attack – which I also did live on this week's Tuesday TOOLSday. I also talk about Exegol's licensing plans (and how it might break your pentest deployments if you use ProxmoxRox).

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7MS #678: How to Succeed in Business Without Really Crying – Part 22

7MS #678: How to Succeed in Business Without Really Crying – Part 22

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7MS #677: That One Time I Was a Victim of a Supply Chain Attack

7MS #677: That One Time I Was a Victim of a Supply Chain Attack

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30 Touko 13min

7MS #676: Tales of Pentest Pwnage – Part 72

7MS #676: Tales of Pentest Pwnage – Part 72

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7MS #675: Pentesting GOAD – Part 2

7MS #675: Pentesting GOAD – Part 2

Hey friends! Today Joe "The Machine" Skeen and I tackled GOAD (Game of Active Directory) again – this time covering: SQL link abuse between two domains Forging inter-realm TGTs to conquer the coveted sevenkingdoms.local! Join us next month when we aim to overtake essos.local, which will make us rulers over all realms!

16 Touko 31min

7MS #674: Tales of Pentest Pwnage – Part 71

7MS #674: Tales of Pentest Pwnage – Part 71

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9 Touko 49min

7MS #673: ProxmoxRox

7MS #673: ProxmoxRox

Today we're excited to release ProxmoxRox – a repo of info and scripts to help you quickly spin up Ubuntu and Windows VMs. Also, some important news items: 7MinSec.club in-person meeting is happening Wednesday, May 14! More details here. We did our second Tuesday TOOLSday this week and showed you some local privesc techniques when you have local admin on an endpoint

3 Touko 30min

7MS #672: Tales of Pentest Pwnage – Part 70

7MS #672: Tales of Pentest Pwnage – Part 70

Today's a fun tale of pentest pwnage where we leveraged a WinRM service ticket in combination with the shadow credentials attack, then connected to an important system using evil-winrm and make our getaway with some privileged Kerberos TGTs! I also share an (intentionally) vague story about a personal struggle I could use your thoughts/prayers/vibes with.

25 Huhti 55min

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