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.

Avsnitt(690)

7MS #121: Migrating from Tumblr to Ghost-Part 2

7MS #121: Migrating from Tumblr to Ghost-Part 2

Part 2 concludes my journey in moving 7ms.us from Tumblr to a Digital Ocean droplet running Ghost. Here are the key resources mentioned during the podcast: How to run multiple Ghost blogs on one DI VPS. The key takeaway here was that I had to upgrade to the $10 droplet (I did a "flexible" resize to add more proc/memory) and then the second instance of Ghost installed fine. Turning on CloudFlare SSL was easy. I chose flexible SSL since I wasn't using a "real" cert. I also wrote a rule to force HTTPs for all connections. And, just for grins, I turned on DNSSEC. Because...why not? :-) I picked a strong root password for my DI droplet, but I still don't like the idea of IPs banging on that connection all day and night. I followed this article on installing Fail2Ban to prevent my SSH login from being abused. There are a few IPs that I want to perma-ban, so I'm going to look throughthis article and this one which looks a tad easier. You can subscribe to the 7 Minute Security podcast here.

19 Dec 20158min

7MS #120: THE PURGE!

7MS #120: THE PURGE!

Announcing the 7MS PURGE! I've got a back log of episodes banked and I want to get caught up for the new year. So I'm going to release one (or maybe more) episodes per day between now and 2016. Plus (spoiler alerts!) in 2016 we're moving to a Monday/Wednesday/Friday release schedule. Yep, 7MS three times a week - thanks for the idea, mom! Subscribe to 7MS on iTunes here.

18 Dec 20152min

7MS #119: Migrating from Tumblr to Ghost-Part 1

7MS #119: Migrating from Tumblr to Ghost-Part 1

In this episode I talk about my adventures in moving my brianjohnson.tv Tumblr content over to a Digital Ocean hosted droplet running Ghost. I think you'll want to check this episode out, because in part 2 I talk about the challenges I faced in hosting multiple Ghost instances on one DI droplet. I will also be talking about how to enable CloudFlare SSL (for free!) as well as enabling Fail2Ban to keep annoying people/IPs from brute forcing your SSH root account!

17 Dec 20158min

7MS #118: Should Phishing be Fair?

7MS #118: Should Phishing be Fair?

This episode discusses an important and rhetorical (to me) infosec question: Should phishing campaigns be "fair?"

15 Dec 20157min

7MS #117: OFFTOPIC-Alive Inside

7MS #117: OFFTOPIC-Alive Inside

Today I talk about one of the most moving films I've ever seen - a documentary called Alive Inside.

10 Dec 20157min

7MS #116: Tips for a Succesful Vulnerability Scan

7MS #116: Tips for a Succesful Vulnerability Scan

In this episode I complain about getting stuck in NY for two days, and also how to efficiently scan for vulnerabilities when your time is crunched.

8 Dec 201514min

7MS #115: OFFTOPIC-Love and Mercy

7MS #115: OFFTOPIC-Love and Mercy

We're going off-topic today and talking about the new(ish) movie about Brian Wilson's life called Love and Mercy.

4 Dec 20157min

7MS #114: PCI Pentesting 101-Part 3

7MS #114: PCI Pentesting 101-Part 3

Part 3 on my series about PCI pentesting. Yeah. That.

2 Dec 20157min

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