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.
Installation
To install xfreerdp, proceed with the following command:
| sudo apt-get install freerdp2-x11
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Basic commands
| # No password indicated. When prompted for one, click Enter and see if it allows us to login
xfreerdp [/d:domain] /u:<username> /v:$ip
xfreerdp [/d:domain] /u:<username> /p:<password> /v:$ip
# /v:{target_IP} : Specifies the target IP of the host we would like to connect to.
xfreerdp [/d:domain] /u:<username> /pth:<hash> /v:$ip /cert:ignore
# /pth:<hash> Pass the hash
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Troubleshoot in PtH attack
Restricted Admin Mode, which is disabled by default, should be enabled on the target host; otherwise, you will be presented with an error. This can be enabled by adding a new registry key DisableRestrictedAdmin (REG_DWORD) under HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Lsa with the value of 0. It can be done using the following command:
| reg add HKLM\System\CurrentControlSet\Control\Lsa /t REG_DWORD /v DisableRestrictedAdmin /d 0x0 /f
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Once the registry key is added, we can use xfreerdp with the option /pth to gain RDP access.
Troubleshooting loging
If we obtain:
| [ERROR][com.freerdp.core] - transport_connect_tls:freerdp_set_last_error_ex ERRCONNECT_TLS_CONNECT_FAILED [0x00020008]
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if the server requires old-style login), we can try:
| xfreerdp /v:10.129.37.186 /u:htb-student /p:HTB_@cademy_stdnt! /cert:ignore /sec:rdp
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We can also force older security:
| xfreerdp /v:10.129.37.186 /u:htb-student /p:HTB_@cademy_stdnt! /cert:ignore /sec:rdp /tls-seclevel:0
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Other suggestions:
| rdesktop -u htb-student -p HTB_@cademy_stdnt! [IP Address]
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