[S] Worked on nim.

elinethingz/security/packer/packer.nim

@@ -0,0 +1,76 @@
+#    _____ ___  ____     ____  _____ ____ ____  _____ _____ 
+#   |_   _/ _ \|  _ \   / ___|| ____/ ___|  _ \| ____|_   _|
+#     | || | | | |_) |  \___ \|  _|| |   | |_) |  _|   | |
+#     | || |_| |  __/    ___) | |__| |___|  _ <| |___  | |
+#     |_| \___/|_|      |____/|_____\____|_| \_\_____| |_|
+
+
+#   see https://github.com/byt3bl33d3r/OffensiveNim/blob/master/src/pop_bin.nim
+#   see https://github.com/byt3bl33d3r/OffensiveNim/blob/master/src/shellcode_bin.nim
+import os
+import system
+
+const
+  MEM_COMMIT = 0x1000
+  MEM_RESERVE = 0x2000
+  PAGE_EXECUTE_READWRITE = 0x40
+
+type
+    HANDLE* = int
+    HWND* = HANDLE
+    UINT* = int32
+    LPCSTR* = cstring
+
+proc MessageBox*(hWnd: HWND, lpText: LPCSTR, lpCaption: LPCSTR, uType: UINT): int32 
+  {.discardable, stdcall, dynlib: "user32", importc: "MessageBoxA".}
+
+MessageBox(0, "Hello, world !", "Nim is Powerful", 0)
+
+
+
+#    LPVOID VirtualAllocEx(
+#      [in]           HANDLE hProcess,
+#      [in, optional] LPVOID lpAddress, BUT IF NULL: automatically calculated
+#      [in]           SIZE_T dwSize,    is an int? size in bytes of memory region. "The size of the region of memory to allocate, in bytes."
+#      [in]           DWORD  flAllocationType,      see https://learn.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-virtualallocex
+#      [in]           DWORD  flProtect
+#    );
+
+# proc NimVirtualAllocEx*(hWnd: HWND, lpAddress: pointer, dwSize: LPCSTR, uType: UINT): int32 
+#  {.discardable, stdcall, dynlib: "user32", importc: "VirtualAllocEx".}
+
+
+# Declare the VirtualAlloc function from Windows API
+proc VirtualAlloc*(addr: pointer void, size: csize_t, allocType: cuint, protect: cuint): pointer cvoid {.importwinapi: "VirtualAlloc".}
+
+# Declare a simple function that will be loaded into the allocated memory
+proc helloWorld() =
+  echo "Hello, World from allocated memory!"
+
+# Main procedure
+proc main(): int =
+  # Calculate the size needed for the function
+  let codeSize = procSize(helloWorld)
+
+  # Allocate memory using VirtualAlloc
+  let allocatedMemory = VirtualAlloc(nil, codeSize, MEM_COMMIT or MEM_RESERVE, PAGE_EXECUTE_READWRITE)
+  if allocatedMemory == nil:
+    echo "Failed to allocate memory."
+    return 1  # Return an error code
+
+  # Copy the function code to the allocated memory
+  memcpy(allocatedMemory, addr(helloWorld), codeSize)
+
+  # Cast the allocated memory to a function pointer
+  let funcPointer: proc() {.cdecl.} = cast[proc()](allocatedMemory)
+
+  # Execute the function in the allocated memory
+  funcPointer()
+
+  # Deallocate the memory (optional)
+  os.free(allocatedMemory)
+
+  return 0  # Return 0 to indicate successful execution
+
+when isMainModule:
+  main()