diff --git a/atomics/Indexes/Indexes-CSV/index.csv b/atomics/Indexes/Indexes-CSV/index.csv
index a906d524..b33fe4f4 100644
--- a/atomics/Indexes/Indexes-CSV/index.csv
+++ b/atomics/Indexes/Indexes-CSV/index.csv
@@ -916,6 +916,7 @@ lateral-movement,T1550.003,Pass the Ticket,1,Mimikatz Kerberos Ticket Attack,dbf
 lateral-movement,T1563.002,RDP Hijacking,1,RDP hijacking,a37ac520-b911-458e-8aed-c5f1576d9f46,command_prompt
 lateral-movement,T1021.001,Remote Desktop Protocol,1,RDP to DomainController,355d4632-8cb9-449d-91ce-b566d0253d3e,powershell
 lateral-movement,T1021.001,Remote Desktop Protocol,2,RDP to Server,7382a43e-f19c-46be-8f09-5c63af7d3e2b,powershell
+lateral-movement,T1021.001,Remote Desktop Protocol,3,Changing RDP Port to Non Standard Port,2f840dd4-8a2e-4f44-beb3-6b2399ea3771,powershell
 lateral-movement,T1021.002,SMB/Windows Admin Shares,1,Map admin share,3386975b-367a-4fbb-9d77-4dcf3639ffd3,command_prompt
 lateral-movement,T1021.002,SMB/Windows Admin Shares,2,Map Admin Share PowerShell,514e9cd7-9207-4882-98b1-c8f791bae3c5,powershell
 lateral-movement,T1021.002,SMB/Windows Admin Shares,3,Copy and Execute File with PsExec,0eb03d41-79e4-4393-8e57-6344856be1cf,command_prompt
diff --git a/atomics/Indexes/Indexes-CSV/windows-index.csv b/atomics/Indexes/Indexes-CSV/windows-index.csv
index 000d0c60..29b23ffe 100644
--- a/atomics/Indexes/Indexes-CSV/windows-index.csv
+++ b/atomics/Indexes/Indexes-CSV/windows-index.csv
@@ -662,6 +662,7 @@ lateral-movement,T1550.003,Pass the Ticket,1,Mimikatz Kerberos Ticket Attack,dbf
 lateral-movement,T1563.002,RDP Hijacking,1,RDP hijacking,a37ac520-b911-458e-8aed-c5f1576d9f46,command_prompt
 lateral-movement,T1021.001,Remote Desktop Protocol,1,RDP to DomainController,355d4632-8cb9-449d-91ce-b566d0253d3e,powershell
 lateral-movement,T1021.001,Remote Desktop Protocol,2,RDP to Server,7382a43e-f19c-46be-8f09-5c63af7d3e2b,powershell
+lateral-movement,T1021.001,Remote Desktop Protocol,3,Changing RDP Port to Non Standard Port,2f840dd4-8a2e-4f44-beb3-6b2399ea3771,powershell
 lateral-movement,T1021.002,SMB/Windows Admin Shares,1,Map admin share,3386975b-367a-4fbb-9d77-4dcf3639ffd3,command_prompt
 lateral-movement,T1021.002,SMB/Windows Admin Shares,2,Map Admin Share PowerShell,514e9cd7-9207-4882-98b1-c8f791bae3c5,powershell
 lateral-movement,T1021.002,SMB/Windows Admin Shares,3,Copy and Execute File with PsExec,0eb03d41-79e4-4393-8e57-6344856be1cf,command_prompt
diff --git a/atomics/Indexes/Indexes-Markdown/index.md b/atomics/Indexes/Indexes-Markdown/index.md
index f7cfaaea..68279bf9 100644
--- a/atomics/Indexes/Indexes-Markdown/index.md
+++ b/atomics/Indexes/Indexes-Markdown/index.md
@@ -1581,6 +1581,7 @@
 - [T1021.001 Remote Desktop Protocol](../../T1021.001/T1021.001.md)
   - Atomic Test #1: RDP to DomainController [windows]
   - Atomic Test #2: RDP to Server [windows]
+  - Atomic Test #3: Changing RDP Port to Non Standard Port [windows]
 - T1563 Remote Service Session Hijacking [CONTRIBUTE A TEST](https://atomicredteam.io/contributing)
 - T1021 Remote Services [CONTRIBUTE A TEST](https://atomicredteam.io/contributing)
 - T1091 Replication Through Removable Media [CONTRIBUTE A TEST](https://atomicredteam.io/contributing)
diff --git a/atomics/Indexes/Indexes-Markdown/windows-index.md b/atomics/Indexes/Indexes-Markdown/windows-index.md
index 3a4a767c..1947c8fd 100644
--- a/atomics/Indexes/Indexes-Markdown/windows-index.md
+++ b/atomics/Indexes/Indexes-Markdown/windows-index.md
@@ -1170,6 +1170,7 @@
 - [T1021.001 Remote Desktop Protocol](../../T1021.001/T1021.001.md)
   - Atomic Test #1: RDP to DomainController [windows]
   - Atomic Test #2: RDP to Server [windows]
+  - Atomic Test #3: Changing RDP Port to Non Standard Port [windows]
 - T1563 Remote Service Session Hijacking [CONTRIBUTE A TEST](https://atomicredteam.io/contributing)
 - T1021 Remote Services [CONTRIBUTE A TEST](https://atomicredteam.io/contributing)
 - T1091 Replication Through Removable Media [CONTRIBUTE A TEST](https://atomicredteam.io/contributing)
diff --git a/atomics/Indexes/index.yaml b/atomics/Indexes/index.yaml
index e2788486..23c30d8b 100644
--- a/atomics/Indexes/index.yaml
+++ b/atomics/Indexes/index.yaml
@@ -65480,6 +65480,31 @@ lateral-movement:
           $p=Tasklist /svc /fi "IMAGENAME eq mstsc.exe" /fo csv | convertfrom-csv
           if(-not ([string]::IsNullOrEmpty($p.PID))) { Stop-Process -Id $p.PID }
         name: powershell
+    - name: Changing RDP Port to Non Standard Port
+      auto_generated_guid: 2f840dd4-8a2e-4f44-beb3-6b2399ea3771
+      description: 'Changing RDP Port to Non Standard Port via Remote Desktop Application
+        over Powershell
+
+'
+      supported_platforms:
+      - windows
+      input_arguments:
+        OLD_Remote_Port:
+          description: Default RDP Listening Port
+          type: String
+          default: '3389'
+        NEW_Remote_Port:
+          description: New RDP Listening Port
+          type: String
+          default: '4489'
+      executor:
+        command: |
+          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_command: "Set-ItemProperty -Path 'HKLM:\\SYSTEM\\CurrentControlSet\\Control\\Terminal
+          Server\\WinStations\\RDP-Tcp' -name \"PortNumber\" -Value #{OLD_Remote_Port}\nRemove-NetFirewallRule
+          -DisplayName \"RDPPORTLatest-TCP-In\"  \n"
+        name: powershell
   T1563:
     technique:
       external_references:
diff --git a/atomics/T1021.001/T1021.001.md b/atomics/T1021.001/T1021.001.md
index 1d647cd1..867f2861 100644
--- a/atomics/T1021.001/T1021.001.md
+++ b/atomics/T1021.001/T1021.001.md
@@ -12,6 +12,8 @@ Adversaries may connect to a remote system over RDP/RDS to expand access if the
 
 - [Atomic Test #2 - RDP to Server](#atomic-test-2---rdp-to-server)
 
+- [Atomic Test #3 - Changing RDP Port to Non Standard Port](#atomic-test-3---changing-rdp-port-to-non-standard-port)
+
 
 <br/>
 
@@ -115,4 +117,44 @@ if(-not ([string]::IsNullOrEmpty($p.PID))) { Stop-Process -Id $p.PID }
 
 
 
+<br/>
+<br/>
+
+## Atomic Test #3 - Changing RDP Port to Non Standard Port
+Changing RDP Port to Non Standard Port via Remote Desktop Application over 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`! 
+
+
+```powershell
+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:
+```powershell
+Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp' -name "PortNumber" -Value #{OLD_Remote_Port}
+Remove-NetFirewallRule -DisplayName "RDPPORTLatest-TCP-In"
+```
+
+
+
+
+
 <br/>