Notepad++ Plugins Plug and Payload

src/SUMMARY.md

@@ -255,6 +255,7 @@
   - [Abusing Auto Updaters And Ipc](windows-hardening/windows-local-privilege-escalation/abusing-auto-updaters-and-ipc.md)
   - [Arbitrary Kernel Rw Token Theft](windows-hardening/windows-local-privilege-escalation/arbitrary-kernel-rw-token-theft.md)
   - [Kernel Race Condition Object Manager Slowdown](windows-hardening/windows-local-privilege-escalation/kernel-race-condition-object-manager-slowdown.md)
+  - [Notepad Plus Plus Plugin Autoload Persistence](windows-hardening/windows-local-privilege-escalation/notepad-plus-plus-plugin-autoload-persistence.md)
   - [Abusing Tokens](windows-hardening/windows-local-privilege-escalation/privilege-escalation-abusing-tokens.md)
   - [Access Tokens](windows-hardening/windows-local-privilege-escalation/access-tokens.md)
   - [ACLs - DACLs/SACLs/ACEs](windows-hardening/windows-local-privilege-escalation/acls-dacls-sacls-aces.md)

src/windows-hardening/windows-local-privilege-escalation/README.md

@@ -741,6 +741,14 @@ Get-ChildItem 'C:\Program Files\*','C:\Program Files (x86)\*' | % { try { Get-Ac
 Get-ChildItem 'C:\Program Files\*','C:\Program Files (x86)\*' | % { try { Get-Acl $_ -EA SilentlyContinue | Where {($_.Access|select -ExpandProperty IdentityReference) -match 'BUILTIN\Users'} } catch {}}
 ```
 
+### Notepad++ plugin autoload persistence/execution
+
+Notepad++ autoloads any plugin DLL under its `plugins` subfolders. If a writable portable/copy install is present, dropping a malicious plugin gives automatic code execution inside `notepad++.exe` on every launch (including from `DllMain` and plugin callbacks).
+
+{{#ref}}
+notepad-plus-plus-plugin-autoload-persistence.md
+{{#endref}}
+
 ### Run at startup
 
 **Check if you can overwrite some registry or binary that is going to be executed by a different user.**\

src/windows-hardening/windows-local-privilege-escalation/notepad-plus-plus-plugin-autoload-persistence.md

@@ -0,0 +1,61 @@
+# Notepad++ Plugin Autoload Persistence & Execution
+
+{{#include ../../banners/hacktricks-training.md}}
+
+Notepad++ will **autoload every plugin DLL found under its `plugins` subfolders** on launch. Dropping a malicious plugin into any **writable Notepad++ installation** gives code execution inside `notepad++.exe` every time the editor starts, which can be abused for **persistence**, stealthy **initial execution**, or as an **in-process loader** if the editor is launched elevated.
+
+## Writable plugin locations
+- Standard install: `C:\Program Files\Notepad++\plugins\<PluginName>\<PluginName>.dll` (usually requires admin to write).
+- Writable options for low-privileged operators:
+  - Use the **portable Notepad++ build** in a user-writable folder.
+  - Copy `C:\Program Files\Notepad++` to a user-controlled path (e.g., `%LOCALAPPDATA%\npp\`) and run `notepad++.exe` from there.
+- Each plugin gets its own subfolder under `plugins` and is loaded automatically at startup; menu entries appear under **Plugins**.
+
+## Plugin load points (execution primitives)
+Notepad++ expects specific **exported functions**. These are all called during initialization, giving multiple execution surfaces:
+- **`DllMain`** — runs immediately on DLL load (first execution point).
+- **`setInfo(NppData)`** — called once on load to provide Notepad++ handles; typical place to register menu items.
+- **`getName()`** — returns the plugin name shown in the menu.
+- **`getFuncsArray(int *nbF)`** — returns menu commands; even if empty, it is called during startup.
+- **`beNotified(SCNotification*)`** — receives editor events (file open/change, UI events) for ongoing triggers.
+- **`messageProc(UINT, WPARAM, LPARAM)`** — message handler, useful for larger data exchanges.
+- **`isUnicode()`** — compatibility flag checked at load.
+
+Most exports can be implemented as **stubs**; execution can occur from `DllMain` or any callback above during autoload.
+
+## Minimal malicious plugin skeleton
+Compile a DLL with the expected exports and place it in `plugins\\MyNewPlugin\\MyNewPlugin.dll` under a writable Notepad++ folder:
+
+```c
+BOOL APIENTRY DllMain(HMODULE h, DWORD r, LPVOID) { if (r == DLL_PROCESS_ATTACH) MessageBox(NULL, TEXT("Hello from Notepad++"), TEXT("MyNewPlugin"), MB_OK); return TRUE; }
+extern "C" __declspec(dllexport) void setInfo(NppData) {}
+extern "C" __declspec(dllexport) const TCHAR *getName() { return TEXT("MyNewPlugin"); }
+extern "C" __declspec(dllexport) FuncItem *getFuncsArray(int *nbF) { *nbF = 0; return NULL; }
+extern "C" __declspec(dllexport) void beNotified(SCNotification *) {}
+extern "C" __declspec(dllexport) LRESULT messageProc(UINT, WPARAM, LPARAM) { return TRUE; }
+extern "C" __declspec(dllexport) BOOL isUnicode() { return TRUE; }
+```
+
+1. Build the DLL (Visual Studio/MinGW).
+2. Create the plugin subfolder under `plugins` and drop the DLL inside.
+3. Restart Notepad++; the DLL is loaded automatically, executing `DllMain` and subsequent callbacks.
+
+## Reflective loader plugin pattern
+A weaponized plugin can turn Notepad++ into a **reflective DLL loader**:
+- Present a minimal UI/menu entry (e.g., "LoadDLL").
+- Accept a **file path** or **URL** to fetch a payload DLL.
+- Reflectively map the DLL into the current process and invoke an exported entry point (e.g., a loader function inside the fetched DLL).
+- Benefit: reuse a benign-looking GUI process instead of spawning a new loader; payload inherits the integrity of `notepad++.exe` (including elevated contexts).
+- Trade-offs: dropping an **unsigned plugin DLL** to disk is noisy; consider piggybacking on existing trusted plugins if present.
+
+## Detection and hardening notes
+- Block or monitor **writes to Notepad++ plugin directories** (including portable copies in user profiles); enable controlled folder access or application allowlisting.
+- Alert on **new unsigned DLLs** under `plugins` and unusual **child processes/network activity** from `notepad++.exe`.
+- Enforce plugin installation via **Plugins Admin** only, and restrict execution of portable copies from untrusted paths.
+
+## References
+- [Notepad++ Plugins: Plug and Payload](https://trustedsec.com/blog/notepad-plugins-plug-and-payload)
+- [MyNewPlugin PoC snippet](https://gitlab.com/-/snippets/4930986)
+- [LoadDLL reflective loader plugin](https://gitlab.com/KevinJClark/ops-scripts/-/tree/main/notepad_plus_plus_plugin_LoadDLL)
+
+{{#include ../../banners/hacktricks-training.md}}