7MS #441: SharpGPOAbuse

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.

Episoder(696)

7MS #625: A Peek into the 7MS Mail Bag - Part 4

7MS #625: A Peek into the 7MS Mail Bag - Part 4

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7MS #624: Tales of Pentest Pwnage – Part 57

7MS #624: Tales of Pentest Pwnage – Part 57

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7MS #623: Prelude to a Tale of Pentest Pwnage

7MS #623: Prelude to a Tale of Pentest Pwnage

Today’s prelude to a tale of pentest pwnage talks about something called “spnless RBCD” (resource-based constrained delegation).  The show notes don't format well here in the podcast notes, so head to 7minsec.com to see the notes in all their glory.

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7MS #622: Migrating from vCenter to Proxmox - Part 1

7MS #622: Migrating from vCenter to Proxmox - Part 1

Sadly, the Broadcom acquisition of VMWare has hit 7MinSec hard – we love running ESXi on our NUCs, but ESXi free is no longer available.  To add insult to injury, our vCenter lab at OVHcloud HQ got a huge price gouge (due to license cost increase; not OVH’s fault).  Now we’re exploring Proxmox as an alternative hypervisor, so we’re using today’s episode to kick off a series about the joys and pains of this migration process.

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7MS #621: Eating the Security Dog Food - Part 6

7MS #621: Eating the Security Dog Food - Part 6

Today we revisit a series about eating the security dog food – in other words, practicing what we preach as security gurus!  Specifically we talk about: We’re going to get a third-party assessment on 7MinSec (the business) Tips for secure email backup/storage Limiting the retention of sensitive data you store in cloud places

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7MS #620: Securing Your Mental Health - Part 5

7MS #620: Securing Your Mental Health - Part 5

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7MS #619: Tales of Pentest Pwnage – Part 56

7MS #619: Tales of Pentest Pwnage – Part 56

We did something crazy today and recorded an episode that was 7 minutes long!  Today we talk about some things that have helped us out in recent pentests: When using Farmer to create “trap” files that coerce authentication, I’ve found way better results using Windows Search Connectors (.searchConnector-ms) files This matrix of “can I relay this to that” has been super helpful, especially early in engagements

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7MS #618: Writing Savage Pentest Reports with Sysreptor

7MS #618: Writing Savage Pentest Reports with Sysreptor

Today’s episode is all about writing reports in Sysreptor.  It’s awesome!  Main takeaways: The price is free (they have a paid version as well)! You can send findings and artifacts directly to the report server using the reptor Python module Warning: Sysreptor only exports to PDF (no Word version option!) Sysreptor has helped us write reports faster without sacrificing quality

5 Apr 202438min

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