Automating MS-RPC vulnerability research

src/network-services-pentesting/135-pentesting-msrpc.md

@@ -89,8 +89,89 @@ It is possible to execute remote code on a machine, if the credentials of a vali
 
 The **rpcdump.exe** from [rpctools](https://resources.oreilly.com/examples/9780596510305/tree/master/tools/rpctools) can interact with this port.
 
+### Automated Interface Enumeration & Dynamic Client Generation (NtObjectManager)
+
+PowerShell guru **James Forshaw** exposed most of the Windows RPC internals inside the open–source *NtObjectManager* module.  Using it you can turn any RPC server DLL / EXE into a **fully-featured client stub** in seconds – no IDL, MIDL or manual unmarshalling required.
+
+```powershell
+# Install the module once
+Install-Module NtObjectManager -Force
+
+# Parse every RPC interface exported by the target binary
+$rpcinterfaces = Get-RpcServer "C:\Windows\System32\efssvc.dll"
+$rpcinterfaces | Format-Table Name,Uuid,Version,Procedures
+
+# Inspect a single procedure (opnum 0)
+$rpcinterfaces[0].Procedures[0] | Format-List *
+```
+
+Typical output exposes parameter types exactly as they appear in **MIDL** (e.g. `FC_C_WSTRING`, `FC_LONG`, `FC_BIND_CONTEXT`).
+
+Once you know the interface you can **generate a ready-to-compile C# client**:
+
+```powershell
+# Reverse the MS-EFSR (EfsRpc*) interface into C#
+Format-RpcClient $rpcinterfaces[0] -Namespace MS_EFSR -OutputPath .\MS_EFSR.cs
+```
+
+Inside the produced stub you will find methods such as:
+
+```csharp
+public int EfsRpcOpenFileRaw(out Marshal.NdrContextHandle ctx, string FileName, int Flags) {
+    // marshals parameters & calls opnum 0
+}
+```
+
+The PowerShell helper `Get-RpcClient` can create an **interactive client object** so you can call the procedure immediately:
+
+```powershell
+$client = Get-RpcClient $rpcinterfaces[0]
+Connect-RpcClient $client -stringbinding 'ncacn_np:127.0.0.1[\\pipe\\efsrpc]' `
+                     -AuthenticationLevel PacketPrivacy `
+                     -AuthenticationType  WinNT  # NTLM auth
+
+# Invoke the procedure → returns an authenticated context handle
+$ctx = New-Object Marshal.NdrContextHandle
+$client.EfsRpcOpenFileRaw([ref]$ctx, "\\\127.0.0.1\test", 0)
+```
+
+Authentication (Kerberos / NTLM) and encryption levels (`PacketIntegrity`, `PacketPrivacy`, …) can be supplied directly via the `Connect-RpcClient` cmdlet – ideal for **bypassing Security Descriptors** that protect high-privilege named pipes.
+
+---
+
+### Context-Aware RPC Fuzzing (MS-RPC-Fuzzer)
+
+Static interface knowledge is great, but what you really want is **coverage-guided fuzzing** that understands *context handles* and complex parameter chains.  The open-source **MS-RPC-Fuzzer** project automates exactly that workflow:
+
+1. Enumerate every interface/procedure exported by the target binary (`Get-RpcServer`).
+2. Generate dynamic clients for each interface (`Format-RpcClient`).
+3. Randomise input parameters (wide strings length, integer ranges, enums) while respecting the original **NDR type**.
+4. Track *context handles* returned by one call to feed follow-up procedures automatically.
+5. Fire high-volume calls against the chosen transport (ALPC, TCP, HTTP or named pipe).
+6. Log exit statuses / faults / timeouts and export a **Neo4j** import file to visualise *interface → procedure → parameter* relationships and crash clusters.
+
+Example run (named–pipe target):
+
+```powershell
+Invoke-MSRPCFuzzer -Pipe "\\.\pipe\efsrpc" -Auth NTLM `
+                   -MinLen 1  -MaxLen 0x400 `
+                   -Iterations 100000 `
+                   -OutDir .\results
+```
+
+A single out-of-bounds write or unexpected exception will be surfaced immediately with the exact opnum + fuzzed payload that triggered it – perfect starting point for a stable proof-of-concept exploit.
+
+> ⚠️  Many RPC services execute in processes running as **NT AUTHORITY\SYSTEM**.  Any memory-safety issue here usually translates to local privilege escalation or (when exposed over SMB/135) *remote code execution*.
+
+---
+
 ## References
 
+- [Automating MS-RPC vulnerability research (2025, Incendium.rocks)](https://www.incendium.rocks/posts/Automating-MS-RPC-Vulnerability-Research/)
+- [MS-RPC-Fuzzer – context-aware RPC fuzzer](https://github.com/warpnet/MS-RPC-Fuzzer)
+- [NtObjectManager PowerShell module](https://github.com/googleprojectzero/sandbox-attacksurface-analysis-tools/tree/master/NtObjectManager)
+
+
 - [https://www.cyber.airbus.com/the-oxid-resolver-part-1-remote-enumeration-of-network-interfaces-without-any-authentication/](https://www.cyber.airbus.com/the-oxid-resolver-part-1-remote-enumeration-of-network-interfaces-without-any-authentication/)
 - [https://www.cyber.airbus.com/the-oxid-resolver-part-2-accessing-a-remote-object-inside-dcom/](https://www.cyber.airbus.com/the-oxid-resolver-part-2-accessing-a-remote-object-inside-dcom/)
 - [https://0xffsec.com/handbook/services/msrpc/](https://0xffsec.com/handbook/services/msrpc/)