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IRQL - Incident Response Query Language

A collection of Kusto (KQL) functions that unify security logs behind a consistent, analyst-friendly dialect. IRQL encapsulates query logic in repeatable chunks, hides cluster/database locations and join keys, and projects disparate source schemas into a single, predictable schema. In addition, it represents query logic as their semantic intent via function naming. These functions were created by Saar Ron, John Lambert, and Diana Damenova.

These functions were authored alongside the Lift to Graph functions (Lift_To_Graph, Graph_Render_View, Graph_Fold_By_Property) and are designed to compose with them. Many of the IRQL primitives have a tabular form and a graph-lifted form, so the same logic drives both relational hunts and visual graph investigations.

Why IRQL?

KQL is a phenomenal tool for analyzing large quantities of data, but queries can get verbose quickly:

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PSGet Code Signing

This is to try and document the behaviour around PowerShellGet/PSResourceGet code signing publisher behaviour.

Setup

The following code can be used to set up this scenario. This must be run as an administrator in Windows PowerShell.

Note: PowerShell uses implicit remoting for the New-SelfSignedCertificate which breaks the constains serialization. You must run this on Windows PowerShell.

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PSGet Code Signing

This is to try and document the behaviour around PowerShellGet/PSResourceGet code signing publisher behaviour.

Setup

The following code can be used to set up this scenario. This must be run as an administrator in Windows PowerShell.

Note: PowerShell uses implicit remoting for the New-SelfSignedCertificate which breaks the constains serialization. You must run this on Windows PowerShell.

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filter ThrowStdOutErrors($messageFilter,[Parameter(ValueFromPipeline)]$obj) {
  if ($obj -is [Management.Automation.ErrorRecord]) {
    if ($obj -match $messageFilter) {
      throw $obj
    } else {
      Write-Error $obj
      return
    }
  }
  $obj

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using namespace System.Management.Automation
using namespace Microsoft.PowerShell.Commands
function Write-FunctionError {
<#
.SYNOPSIS
Writes an error within the context of the containing CmdletBinding() function. Makes error displays prettier
.NOTES
ScriptStackTrace will still show Write-FunctionError, so its not completely transparent. There's no way to "edit" or "replace" this stacktrace that I can find.
.EXAMPLE
function test {

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MS-MSDT 0-day Office RCE

MS Office docx files may contain external OLE Object references as HTML files. There is an HTML sceme "ms-msdt:" which invokes the msdt diagnostic tool, what is capable of executing arbitrary code (specified in parameters).

The result is a terrifying attack vector for getting RCE through opening malicious docx files (without using macros).

Here are the steps to build a Proof-of-Concept docx:

1. Open Word (used up-to-date 2019 Pro, 16.0.10386.20017), create a dummy document, insert an (OLE) object (as a Bitmap Image), save it in docx.

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#requires -version 7
#You can load this script with $(iwr https://tinyurl.com/TraceAICommand | iex)
using namespace Microsoft.ApplicationInsights
using namespace Microsoft.ApplicationInsights.Extensibility
using namespace Microsoft.ApplicationInsights.DataContracts
using namespace System.Management.Automation
using namespace System.Collections.Generic
using namespace System.Net

#Reference: https://docs.microsoft.com/en-us/azure/azure-monitor/app/console

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# Taken from : https://github.com/EmpireProject/Empire/blob/master/lib/modules/powershell/collection/WebcamRecorder.py
function Start-WebcamRecorder
{
  <#
  .SYNOPSIS
  This function utilizes the DirectX and DShowNET assemblies to record video from the host's webcam.
  Author: Chris Ross (@xorrior)
  License: BSD 3-Clause
  .DESCRIPTION
  This function will capture video output from the hosts webcamera. Note that if compression is available, there isn't 

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using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices;

namespace ByteArrayExec
{

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$WMI = @{
    Query = "SELECT * FROM __InstanceModificationEvent WITHIN 5 WHERE TargetInstance ISA 'MSFT_MpPreference' AND TargetInstance.DisableRealtimeMonitoring=True"
    Action = {
	      #$Global:Data = $Event
        Write-Host "Defender Configuration change - DisableRealtimeMonitoring:"$Event.SourceEventArgs.NewEvent.TargetInstance.DisableRealtimeMonitoring"(Old Value:"$Event.SourceEventArgs.NewEvent.PreviousInstance.DisableRealtimeMonitoring")"
    }
	Namespace = 'root\microsoft\windows\defender'
    SourceIdentifier = "Defender.DisableRealtimeMonitoring"
}
$Null = Register-WMIEvent @WMI