Mearman

A collection of snippets

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.

CCob

#ifndef PATCHLESS_AMSI_H
#define PATCHLESS_AMSI_H

#include <windows.h>

static const int AMSI_RESULT_CLEAN = 0;

PVOID g_amsiScanBufferPtr = nullptr;

unsigned long long setBits(unsigned long long dw, int lowBit, int bits, unsigned long long newValue) {

MidSpike

CVE-2022-23812

---

RIAEvangelist/node-ipc is malware / protestware

The RIAEvangelist/node-ipc module contains protestware peacenotwar.

Excerpt from RIAEvangelist/node-ipc:

as of v11.0.0 & v9.2.2 this module uses the peacenotwar module.

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

notareverser

#!/usr/bin/env python3

# yes, this is crappy code
# yes, it generally gets the job done


import sys

def countRules(data): return data.count('rule ')

bugbountynights

${ctx:loginId}
${map:type}
${filename}
${date:MM-dd-yyyy}
${docker:containerId}
${docker:containerName}
${docker:imageName}
${env:USER}
${event:Marker}
${mdc:UserId}

SwitHak

Security Advisories / Bulletins / vendors Responses linked to Log4Shell (CVE-2021-44228)

Errors, typos, something to say ?

• If you want to add a link, comment or send it to me
• Feel free to report any mistake directly below in the comment or in DM on Twitter @SwitHak

Other great resources

• Royce Williams list sorted by vendors responses Royce List
• Very detailed list NCSC-NL
• The list maintained by U.S. Cybersecurity and Infrastructure Security Agency: CISA List

mgraeber-rc

filter Send-AmsiContent {
<#
.SYNOPSIS

Supplies the AmsiScanBuffer function with a buffer to be scanned by an AMSI provider.

Author: Matt Graeber
Company: Red Canary

.DESCRIPTION

byt3bl33d3r

{
        # This instructs Caddy to hit the LetsEncrypt staging endpoint, in production you should remove this.
        acme_ca https://acme-staging-v02.api.letsencrypt.org/directory
}

(proxy_upstream) {
        # Enable access logging to STDOUT
        log
        
        # This is our list of naughty client User Agents that we don't want accessing our C2