thesamesam

FAQ on the xz-utils backdoor (CVE-2024-3094)

This is a living document. Everything in this document is made in good faith of being accurate, but like I just said; we don't yet know everything about what's going on.

Background

On March 29th, 2024, a backdoor was discovered in xz-utils, a suite of software that

two06

#!/usr/bin/python3
import requests
import sys
import uuid
from requests.packages.urllib3.exceptions import InsecureRequestWarning

#Disable annoying warnings about using burp proxy. 
requests.packages.urllib3.disable_warnings(InsecureRequestWarning)

http_proxy  = "http://127.0.0.1:8080"

adamsvoboda

%windir%\system32\WerFaultSecure.exe
%windir%\system32\mrt.exe
%windir%\system32\svchost.exe
%windir%\system32\NETSTAT.EXE
%windir%\system32\wbem\WmiPrvSE.exe
%windir%\system32\DriverStore\FileRepository\*\NVWMI\nvWmi64.exe
%programfiles(x86)%\Microsoft Intune Management Extension\ClientHealthEval.exe
%programfiles(x86)%\Microsoft Intune Management Extension\SensorLogonTask.exe
%programfiles(x86)%\Microsoft Intune Management Extension\Microsoft.Management.Services.IntuneWindowsAgent.exe
%programdata%\Microsoft\Windows Defender Advanced Threat Protection\DataCollection\*\OpenHandleCollector.exe

mvelazc0

general:
  cloud_provider: aws
  attack_range_password: AW^@#^%&^#@##
  use_prebuilt_images_with_packer: '0'
  key_name: yourkey-001423
  ip_whitelist: 8.8.8.8 #your public ip address
  attack_range_name: test-range
aws:
  private_key_path: /Users/your/key-001423.key
  region: us-west-2

X-C3LL

// Obtain teams token - you can reuse it for GoMapEnum for example
// Author: Juan Manuel Fernandez (@TheXC3LL)

const puppeteer = require('puppeteer');

(async () => {
    console.log("\t\tMS Teams Token Generator - @TheXC3LL\n\n");
    const username = process.argv[2];
    const password = process.argv[3];
    console.log("[*] Using credentials: %s:%s", username, password);

ThunderGunExpress

//All credit goes to Ysoserial.net and the great @tiraniddo
//Snippets copied from ysoserial.net
//https://thewover.github.io/Mixed-Assemblies/ - Great read!
//https://bishopfox.com/blog/cve-2019-18935-remote-code-execution-in-telerik-ui - Another great read
using System;
using System.Collections.Generic;
using System.Runtime.Serialization.Formatters.Binary;
using System.IO;
using System.Reflection;

X-C3LL

' Proof of Concept: retrieving SSN for syscalling in VBA
' Author: Juan Manuel Fernandez (@TheXC3LL)


'Based on:
'https://www.mdsec.co.uk/2020/12/bypassing-user-mode-hooks-and-direct-invocation-of-system-calls-for-red-teams/
'https://www.crummie5.club/freshycalls/


Private Type LARGE_INTEGER

wdormann

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Associations]
"HighRiskFileTypes"=".appinstaller;.application;.appx;.appxbundle;.diagcab;.diagpkg;.diagcfg;.fluid;.fxb;.glb;.gltf;.library-ms;.loop;.msix;.partial;.perfmoncfg;.pko;.ply;.ppkg;.qds;.rat;.resmoncfg;.search-ms;.searchConnector-ms;.settingcontent-ms;.stl;.symlink;.theme;.themepack;.UDL;.url;.wab;.wbcat;.wcx;.website;.whiteboard;.xbap;.ZFSendToTarget;"

rqu1

from hashlib import md5, sha1
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
from base64 import b64encode, b64decode
import sys, time
import requests

DEFAULT_MASTERKEY=b'p1a2l3o4a5l6t7o8'

class PanCrypt():

Cracked5pider

BOOL TransportSend( LPVOID Data, SIZE_T Size, PVOID* RecvData, PSIZE_T RecvSize )
{
#ifdef TRANSPORT_HTTP
    HANDLE  hConnect        = NULL;
    HANDLE  hSession        = NULL;
    HANDLE  hRequest        = NULL;
    
    DWORD   HttpFlags       = 0;

    LPVOID  RespBuffer      = NULL;