7MS #441: SharpGPOAbuse
7 Minute Security15 Nov 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.

Episoder(684)

7MS #28: Infosec for Kids? (audio)

7MS #28: Infosec for Kids? (audio)

This is more of a random, wondering aloud type of episode as I think about raising my kids with infosec in mind. Specifically, what’s life going to be like for them growing up in an Internet-soaked world where there are constantly text/video/photos of them going online – to stay forever? Download: 7MS #28: Infosec for Kids?…

27 Sep 20147min

7MS #27: Backing Up with CrashPlan (audio)

7MS #27: Backing Up with CrashPlan (audio)

Hey, when it comes to backups…uh…you should have them! This is a NON-endorsed/sponsored episode about my personal favorite backup service called CrashPlan. Download: 7MS #27: Backing Up with Crashplan (audio)

20 Sep 20147min

7MS #26: The Importance of Training and Awareness (audio)

7MS #26: The Importance of Training and Awareness (audio)

Training and awareness – specifically as it relates to infosec – is something companies can’t spend enough $ on. But from my experience, not enough of them are making this a front-burner priority. This episode talks about one topic I’m particularly passionate about. I call it “How not to click on bad stuff.” Download: 7MS #26:…

13 Sep 20147min

7MS #25: Writing Better Pentest Reports (audio)

7MS #25: Writing Better Pentest Reports (audio)

This episode talks about some pointers, tools and tips towards writing better pentest reports. Download: 7MS #25: Writing Better Pentest Reports (audio)

23 Aug 20148min

7MS #24: Why Wireless Scares Me (audio)

7MS #24: Why Wireless Scares Me (audio)

This episode is all about why you should (probably not) use wireless hotspots, and keeping yourself safe in general when surfing the Web. Download: 7MS #24: Why Wireless Scares Me (audio)

16 Aug 20147min

7MS #23: OSCP – part 2 (audio)

7MS #23: OSCP – part 2 (audio)

In this episode I talk more about my adventures with OSCP and Offensive Security! . Download: 7MS #23: OSCP – part 2 (audio) Show notes: I recommend documenting ALL the exercises in the PDF. My understanding is that extra effort could be rewarded if you don’t do so hot on your final exam. Buffer overflows make…

9 Aug 20147min

7MS #22: Phishing with Black Squirrel (audio)

7MS #22: Phishing with Black Squirrel (audio)

In this episode I talk about using Black Squirrel to launch phishing campaigns! Download: 7MS #22: Phishing with Black Squirrel (audio) Show notes: Security Weekly is an excellent podcast/resource. Devour it regularly. Black Squirrel is the main tool discussed in this podcast. I’ve been using it for phishing campaigns and it’s been excellent in that capacity.

27 Jul 20147min

7MS #21: OSCP – part 1 (audio)

7MS #21: OSCP – part 1 (audio)

In this episode I talk about my venture into Offensive Security! . Download: 7MS #21: OSCP – part 1 (audio) Show notes: It’s official – I have a death wish and have started the OSCP training. This episode is the first of what I hope will be a multi-part, spoiler-free series about my experience with OSCP. With…

20 Jul 20147min

Populært innen Politikk og nyheter

giver-og-gjengen-vg
aftenpodden
forklart
aftenpodden-usa
stopp-verden
popradet
dine-penger-pengeradet
nokon-ma-ga
det-store-bildet
fotballpodden-2
unitedno
aftenbla-bla
e24-podden
rss-penger-polser-og-politikk
rss-ness
rss-fredrik-og-zahid-loser-ingenting
bt-dokumentar-2
oppdatert
ukrainapodden
rss-borsmorgen-okonominyhetene