Mitigate metasm relocation error by disabling ASLR

Deal with import error by actually using the GetProcAddress code.

Author: scriptjunkie

lib/msf/core/exe/segment_injector.rb

@@ -37,7 +37,6 @@ def create_thread_stub
         push hook_funcname
         push eax
         call [iat_GetProcAddress]
-        mov eax, [iat_CreateThread]
         lea edx, [thread_hook]
         push 0
         push 0
@@ -85,6 +84,9 @@ def generate_pe
       pe.mz.encoded.export = pe_orig.encoded[0, 512].export.dup
       pe.header.time = pe_orig.header.time
 
+      # Don't rebase if we can help it since Metasm doesn't do relocations well
+      pe.optheader.dll_characts.delete("DYNAMIC_BASE")
+
       prefix = ''
       if pe.header.characteristics.include? "DLL"
         # if there is no entry point, just return after we bail or spawn shellcode