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**LAPS** allows you to **manage the local Administrator password** (which is **randomised**, unique, and **changed regularly**) on domain-joined computers. These passwords are centrally stored in Active Directory and restricted to authorised users using ACLs. Passwords are protected in transit from the client to the server using Kerberos v5 and AES.
When using LAPS, **2 new attributes** appear in the **computer** objects of the domain: **`ms-msc-AdmPwd`** and **`ms-mcs-AdmPwdExpirationTime`**_._ These attributes contains the **plain-text admin password and the expiration time**. Then, in a domain environment, it could be interesting to check **which users can read** these attributes.
You could **download the raw LAPS policy** from `\\dc\SysVol\domain\Policies\{4A8A4E8E-929F-401A-95BD-A7D40E0976C8}\Machine\Registry.pol` and then use **`Parse-PolFile`** from the [**GPRegistryPolicyParser**](https://github.com/PowerShell/GPRegistryPolicyParser) package can be used to convert this file into human-readable format.
Moreover, the **native LAPS PowerShell cmdlets** can be used if they're installed on a machine we have access to:
The [LAPSToolkit](https://github.com/leoloobeek/LAPSToolkit) facilitates the enumeration of LAPS this with several functions.\
One is parsing **`ExtendedRights`** for **all computers with LAPS enabled.** This will show **groups** specifically **delegated to read LAPS passwords**, which are often users in protected groups.\
An **account** that has **joined a computer** to a domain receives `All Extended Rights` over that host, and this right gives the **account** the ability to **read passwords**. Enumeration may show a user account that can read the LAPS password on a host. This can help us **target specific AD users** who can read LAPS passwords.
Once admin, it's possible to **obtain the passwords** and **prevent** a machine from **updating** its **password** by **setting the expiration date into the future**.
The password will still reset if an **admin** uses the **`Reset-AdmPwdPassword`** cmdlet; or if **Do not allow password expiration time longer than required by policy** is enabled in the LAPS GPO.
{% endhint %}
### Backdoor
The original source code for LAPS can be found [here](https://github.com/GreyCorbel/admpwd), therefore it's possible to put a backdoor in the code (inside the `Get-AdmPwdPassword` method in `Main/AdmPwd.PS/Main.cs` for example) that will somehow **exfiltrate new passwords or store them somewhere**.
Then, just compile the new `AdmPwd.PS.dll` and upload it to the machine in `C:\Tools\admpwd\Main\AdmPwd.PS\bin\Debug\AdmPwd.PS.dll` (and change the modification time).
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