From 8e362ebc3c07c6786914508a4d37f0dfec5959c7 Mon Sep 17 00:00:00 2001
From: daniel <daniel@planethacker.net>
Date: Wed, 7 May 2025 08:31:50 -0700
Subject: initial commit

---
 verifier.cpp | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 verifier.cpp

(limited to 'verifier.cpp')

diff --git a/verifier.cpp b/verifier.cpp
new file mode 100644
index 0000000..9a2efd4
--- /dev/null
+++ b/verifier.cpp
@@ -0,0 +1,96 @@
+/* VerifierDll example:
+ * https://docs.microsoft.com/en-us/archive/blogs/reiley/a-debugging-approach-to-application-verifier
+ *
+ * Hooking example:
+ * https://github.com/ionescu007/HookingNirvana/blob/master/verif.dll/verif.c
+ *
+ *
+ * To use:
+ * New subkey: HKLM\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\whatever.exe
+ *             GlobalGlag    REG_DWORD    256 (0x00000100)
+ *             VerifierDlls  REG_SZ       whatever.dll
+ *
+ * "whatever.dll" must be placed into System32 folder
+ * running "whatever.exe" will now import this DLL whenever it is run.
+ *
+ * This works on XP -> 10
+ */
+
+#include <Windows.h>
+#include "verifier.h"
+
+
+typedef BOOL	(WINAPI* PCLOSE_HANDLE)(HANDLE);
+BOOL			WINAPI CloseHandleHook(HANDLE hObject);
+
+
+/* Thunks https://en.wikipedia.org/wiki/Thunk */
+
+
+/* Hook functions here. */
+static RTL_VERIFIER_THUNK_DESCRIPTOR aThunks[] = {
+	{ "CloseHandle", NULL, (PVOID)(ULONG_PTR)CloseHandleHook},
+	{NULL, NULL, NULL}
+};
+
+static RTL_VERIFIER_DLL_DESCRIPTOR atDLLs[] = {
+	{ L"kernel32.dll", 0, NULL, aThunks},		// CloseHandle()
+	{NULL, 0, NULL, NULL}
+};
+
+static RTL_VERIFIER_PROVIDER_DESCRIPTOR tVpd = { sizeof(RTL_VERIFIER_PROVIDER_DESCRIPTOR), atDLLs };
+
+
+/* CloseHandle() hook. This creates a file for demonstration
+   purposes. */
+BOOL WINAPI CloseHandleHook(HANDLE hObject)
+{
+	HANDLE h;
+	BOOL fRetVal = ((PCLOSE_HANDLE)(ULONG_PTR)(aThunks[0].ThunkOldAddress))(hObject);
+	h = CreateFile("C:\\users\\dmfr\\foo\\hooked.txt", GENERIC_WRITE, 0, NULL, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, NULL);
+	CloseHandle(h);
+	return fRetVal;
+}
+
+/* This will run calc.exe when this verifierdll is loaded for
+   demonstration purposes. */
+void ModuleLoaded(void)
+{
+	STARTUPINFO info = { sizeof(info) };
+	PROCESS_INFORMATION processInfo;
+
+	CreateProcess("c:\\windows\\system32\\calc.exe", "", NULL, NULL, TRUE, 0, NULL, NULL, &info, &processInfo);
+}
+
+BOOL ProcessVerifier(IN PVOID lpReserved)
+{
+	*((PRTL_VERIFIER_PROVIDER_DESCRIPTOR *)lpReserved) = &tVpd;
+
+	CreateThread(0, 0, (LPTHREAD_START_ROUTINE) ModuleLoaded, 0, 0, 0);
+
+	return TRUE;
+}
+
+
+/* DllMain() - Entry point. */
+BOOL WINAPI DllMain(HINSTANCE hModule, DWORD fdwReason, LPVOID lpReserved)
+{
+	HANDLE h;
+	UNREFERENCED_PARAMETER(hModule);
+
+	switch (fdwReason) {
+		case DLL_PROCESS_VERIFIER:
+			/* Create a file to demonstrate that the DLL has loaded. */
+			h = CreateFile("C:\\users\\dmfr\\foo\\opened.txt", GENERIC_WRITE, 0, NULL, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, NULL);
+			CloseHandle(h);
+			return ProcessVerifier(lpReserved);
+
+		case DLL_PROCESS_ATTACH:
+		case DLL_THREAD_ATTACH:
+		case DLL_THREAD_DETACH:
+		case DLL_PROCESS_DETACH:
+			break;
+	}
+
+	return TRUE;
+}
-- 
cgit v1.2.3