Microsoft MDASH AI Uncovers 16 Windows Flaws — Patch Advisory & Verification Guide

---
title: Potential Windows Kernel Exploitation via Suspicious Driver Load
id: 8a4c32b1-1f2e-4a3b-9c1d-5e8f6a7b8c9d
status: experimental
description: Detects the loading of drivers with known suspicious characteristics or from unusual paths, often indicative of kernel-mode exploit attempt or rootkit deployment targeting recently patched vulnerabilities.
references:
  - https://attack.mitre.org/techniques/T1543/003/
author: Security Arsenal
date: 2026/05/13
tags:
  - attack.privilege_escalation
  - attack.t1543.003
logsource:
  category: driver_load
  product: windows
detection:
  selection:
    Signed: 'false'
  condition: selection
falsepositives:
  - Legacy hardware drivers in development environments
level: high
---
title: Windows Update Service Tampering
id: b2d4e6f8-9a1c-4d5e-8f7a-6b5c4d3e2f1a
status: experimental
description: Detects attempts to stop or disable the Windows Update service (wuauserv), which may indicate an attempt to prevent patching of the MDASH-identified vulnerabilities.
references:
  - https://attack.mitre.org/techniques/T1562/001/
author: Security Arsenal
date: 2026/05/13
tags:
  - attack.defense_evasion
  - attack.t1562.001
logsource:
  category: process_creation
  product: windows
detection:
  selection:
    Image|endswith:
      - '\sc.exe'
      - '\net.exe'
      - '\net1.exe'
      - '\powershell.exe'
      - '\cmd.exe'
    CommandLine|contains:
      - ' stop wuauserv'
      - ' disable wuauserv'
      - 'Stop-Service -Name wuauserv'
      - 'Set-Service -Name wuauserv -StartupType Disabled'
  condition: selection
falsepositives:
  - Legitimate administrative maintenance (rare)
level: medium

// Hunt for systems that may have missed the recent Patch Tuesday updates
// Correlate OS version with known update rollout
let PatchTuesdayDate = datetime(2026-05-12);
DeviceProcessEvents
| where Timestamp > PatchTuesdayDate
| where ProcessName in ("wuauclt.exe", "usoclient.exe", "musnotificationux.exe")
| where ProcessCommandLine contains "UpdateAgent" or ProcessCommandLine contains "ScanInstallWait"
| summarize arg_max(Timestamp, *) by DeviceId, DeviceName
| project DeviceId, DeviceName, Timestamp, ProcessCommandLine, InitiatingProcessAccountName
| extend UpdateStatus = "Update Process Initiated"
| join kind=leftouter (
    DeviceInfo
    | where OSVersion !contains ("2026-05" or "May2026") // Simplified string check for KB article context
    | project DeviceId, OSVersion, LastSeen
) on DeviceId
| where isempty(OSVersion) // Potential missed update systems

-- Hunt for unsigned or improperly signed drivers loaded into the kernel
-- This is a common post-exploitation step for kernel bugs
SELECT Sys.BootTime, Name, ImagePath, Signed, Signer
FROM glob(globs="/*", root=sys.Syscall.ListModules())
WHERE NOT Signed
   OR Signer =~ "Microsoft Windows" OR Signer =~ "Microsoft Corporation"
ORDER BY Sys.BootTime DESC

<#
.SYNOPSIS
    Verifies installation of the May 2026 Security Updates (Patch Tuesday).
    This script checks for the presence of the OS Build revision associated with the MDASH fixes.
#>

$ExpectedBuildMonth = "05"
$ExpectedBuildYear = "2026"
$CurrentOSInfo = Get-ComputerInfo
$CurrentBuild = $CurrentOSInfo.OsVersion
$CurrentUptime = (Get-Date) - $CurrentOSInfo.OsUptime

Write-Host "[+] Checking System Patch Status..." -ForegroundColor Cyan
Write-Host "    Current OS Build: $CurrentBuild"

# Determine if the system has been updated recently (since the Patch Tuesday release)
# Note: Adjust the logic based on specific KB numbers once released by Microsoft vendor advisories.
$Hotfixes = Get-HotFix | Where-Object { $_.InstalledOn -gt (Get-Date).AddDays(-7) }

if ($Hotfixes) {
    Write-Host "[+] Recent Security Updates Found:" -ForegroundColor Green
    $Hotfixes | Format-Table HotFixID, InstalledOn, Description -AutoSize
} else {
    Write-Host "[!] WARNING: No recent updates found in the last 7 days." -ForegroundColor Red
    Write-Host "    This system may be vulnerable to the MDASH-discovered flaws." -ForegroundColor Red
    Write-Host "    ACTION REQUIRED: Run Windows Update immediately."
}

# Check for Windows Update Service Health
$WuaService = Get-Service -Name wuauserv
if ($WuaService.Status -ne "Running") {
    Write-Host "[!] WARNING: Windows Update Service is not running." -ForegroundColor Yellow
    Write-Host "    Attempting to start service..."
    Start-Service -Name wuauserv -ErrorAction SilentlyContinue
}