Behinder webshell. You signed in with another tab or window.

Behinder webshell py: Minimal client for Behinder PHP webshell (shell. A South Korean medical establishment’s Windows IIS server with a Picture Archiving and Communication System (PACS) has been attacked, as identified by AhnLab Security Contribute to cns1rius/webshell_pcap_decode development by creating an account on GitHub. A web shell is a malicious script, acting as a backdoor, that can be uploaded to a web server to enable remote Contribute to leezp/webshell development by creating an account on GitHub. 收集JSP Webshell的各种姿势 - threedr3am/JSP-WebShells The second-stage webshell is Behinder[6], a famous open-source webshell in Chinese threat actors. IOException: Class not found at org. Curate this topic Webshell is a malicious program that might result in data theft, file modification, or other damaging behaviors once uploaded to a server. 0 stars 0 fork 0 watcher. The actor heavily relies on the Godzilla webshell, uploading several variations of the open-source webshell to the compromised server over the course of the operation. jar 启动报错： java. python generator. Sign in Product Actions. rebeyond has 9 repositories available. decodeBuffer(uploadString))). On March 25, Digging deeper, the researchers found that the attacker was using the Behinder framework, This is a webshell open source project. Behinder webshell clients. Contribute to AV1080p/WebShell-1 development by creating an account on GitHub. Open Superhero-zero opened this issue Sep 13, 2023 · 11 comments Open Behinder_v4. The threat actor utilized the WebLogic vulnerability CVE-2020-14882 to upload a JSP webshell on the vulnerable system, enabling persistence and control over the system. Exception,不再支持源选项7。 请使用8或更高版本 #308 opened Nov 26, 2024 by JuJu0225 Collect JSP webshell of various implementation methods. Security Cybersecurity InformationNational Agency Detect and Prevent Web Shell Malware Summary Cyber actors have increased the use of web shell malware for computer network exploitation [1][2][3][4]. - pen4uin/java-memshell-generator 二开冰蝎. Find and fix vulnerabilities Codespaces. php -d string -d Behinder(Be) | Godzilla(God) -e string xor aes 128 only Behinder and Godzilla -h help -l string -l spring tomacat resin jdk -p string -p password (default "noway") -s string -s php Looking at the block above, we first have the name of the function, the regex used to match, data capture regex (sometimes you may want to tweak what to capture vs what matches) and PreDecodeActions. objectweb. Contribute to xiecat/wsm development by creating an account on GitHub. Contribute to hosch3n/msmap development by creating an account on GitHub. 一. Contribute to zzwTVT/Behinder_webshell development by creating an account on GitHub. They exploited this access sporadically over a period of 51 days to retrieve additional information from backend database servers, which led to an increase in network activity and their subsequent discovery. exe written in . Reload to refresh your session. 1. We believe this software was # Behinder Webshell Clients ## php_cmd. Moreover, none of these webshells were detected by anti-malware products. Compatible with various Containers, Components, Behinder. Type default_aes | Inject Tomcat Valve. 冰蝎 哥斯拉 WebShell bypass. (Click image for larger size. Find and fix vulnerabilities Actions. doFinal(new sun. 冰蝎 是一款基于 Java开发 的动态加密通信流量的新型 Webshell 客户端，由于通信流量被加密，传统的WAF、IDS 设备 难以 检测，给威胁狩猎带来较大挑战。 冰蝎其最大特点就是对交互流量进行对称加密，且加密密钥是 A webshell for multiple web languages (asp/aspx, jsp/jspx, php), openly distributed through Github. 0）、蚁剑（AntSword）、哥斯拉（Godzilla Shell管理工具）。 “冰蝎”是一个动态二进制加密网站管理客户端，由于基于流量加密的webshell变得越来越多，"冰蝎"在此应运而生。 Msmap is a Memory WebShell Generator. None. Its source shown as below: So, I wrote a webshell via defineClass just like Behinder, webshell_detect. lang. Automate any workflow Codespaces Bypass EDR(Endpoint Detection and Response) environment to write Behinder jsp webshell onto webserver. Contribute to h0nayuzu/WebshellBypass development by creating an account on GitHub. NET-Memshell-Scanner Decoder / Decryptor / Hasher Decoder Base64 Hex XOR 自建 WebShell 流量数据集. behinder. To review, open the file in an editor that reveals hidden Unicode 冰蝎Behinder V4. E. webshell memshell behinder-memshell jetty-memshell tomcat-memshell weblogic-memshell jboss-memshell websphere-memshell spring-memshell Updated Nov 6, 2020 Java 简介 冰蝎Behinder是一款支持多种语言的WebShell管理工具，其功能多样、支持多种语言、支持流量加密等功能为这款强大的WebShell工具立下了不错的口碑。冰蝎WebShell现在支持的语言包含：PHP、JSP、JSPX、ASP、ASHX、ASPX。 传输协议详解：冰蝎v4. It features AES encryption, random keys, and long connections, posing challenges for This indicates an attempt to use Behinder web shell. Contribute to mikesxrs/Open-Source-YARA-rules development by creating an account on GitHub. Figure 8. 问题： 冰蝎连接shell失败 报错：[ERROP]连接失败：java. newInstance(). 在攻防中，behinder被大范围使用，其加密性和隐蔽性均得到认可，但是同样也被各大杀毒厂商标记，本文从behinder的webshell到原理进行一个简单的解析。 Behinder 冰蝎源码阅读与去特征浅析 - FreeBuf网络安全行业门户 用于解密Behinder（冰蝎）webshell流量的Python工具。它能够分析pcap文件，解密并格式化Behinder的HTTP请求和响应数据。 - ba0gu0/behinder-decryptor Saved searches Use saved searches to filter your results more quickly 二开冰蝎. 记录自己研究的一些的免杀一句话webshell（根据免杀的引擎分别记录）. Currently, there are six versions. Contribute to Suki1i1i/Bypass_Webshell development by creating an 本段内容是希望在分享在攻防对抗的过程中webshell木马的变化，来给大家提供一些对于免杀方法的一个思路。如果有不全面的地方，多多指教。 理论上webshell木马的绕过，分为两类。第一类是webshell木马上传时的绕过，此类绕过方法的核心是关键函数的隐藏。 This is a webshell collection project. ### Appendix I: Malware Table Below malware table summarize the malware used in attacks related to CVE-2023-26360. This is a webshell open source project. ClassReader 一款支持自定义的 Java 内存马生成工具｜A customizable Java in-memory webshell generation tool. Latest version updata Behinder_v4. ClassReader. 冰蝎简介 什么是冰蝎 “冰蝎”是一个动态二进制加密网站管理客户端。 在实战中一代webshell管理工具“菜刀”的流量特征非常明显，很容易就被安全设备检测到。 基于流量加密的webshell变得越来越多，“冰蝎”在此应运而生。 sid类型： 0~1000000 Sourcefire VRT 保留 2000001~2999999 EMerging Threats(ET) 3000000~3999999 公用 网络扫描 3000000～3000999 暴力破解 3001000～3001999 漏洞利用 3002000～3002999 后门链接 3003000～3003999 WebShell 3004000～3004999 病毒木马 3005000～3005999 间谍软件 3006000～3006999 安全认证 3007000～3007999 代码执行 This is a webshell open source project. Contribute to m0cun/Encode_Decode_webshell development by creating an account on GitHub. Normal Exact Match CVE Lookup ID Lookup Windows IIS Servers often host critical web applications and services that provide a gateway to sensitive data and systems due to which hackers attack Windows IIS servers. 25-b02, mixed mode) 使用命令:java -jar Behinder. The heap data led Volexity to Java programming language’s strings. The crafted ZIP archive used a Zip Slip attack to exploit CVE-2021-20022, which caused the web shell to be written to the web-accessible Apache Tomcat directory \Apache Software Foundation\Tomcat Behinder source code. Due to the low volume of access to the webshell, Veloxity assessed that it appeared to have been used as a secondary means of access. equals(pageContext);%> WebShell CMD / SH AntSword JSPJS Behinder Godzilla No need for modularity Proxy: Neo-reGeorg, wsproxy Killer: java-memshell-scanner, ASP. After deploying Behinder, the actors deployed a “custom file upload shell” and the China Chopper webshell. 2022-11 A curated collection of webshells for various platforms, including PHP, ASP, JSP, and more. Its source shown as below: So, I wrote a webshell via defineClass just like Behinder, 冰蝎介绍 Webshell管理工具，动态二进制加密网站客户端。流量动态加密，攻击特征安全设备（WAF、WebIDS）难以检测。 冰蝎通信过程中使用AES（高级加密算法，对称加密，微信小程序使用此种方法）进行加 This key is also the default value when you generate a shell template using the Behinder or derivative Godzilla webshell frameworks. Type default_xor_base64 Msmap is a Memory WebShell Generator. Contribute to webraybtl/webshell_detect development by creating an account on GitHub. beta10下也能浮现该问题，报错： java. Contribute to tennc/webshell development by creating an account on GitHub. Born at : Sept. jar到服务器用来承载webshell功能； 冰蝎服务端调用Java API将 new U(this. Write Behinder_webshell to target using CVE-2022-39952 - shiyeshu/CVE-2022-39952_webshell The file was a well-known copy of the JSP variant of the China Chopper webshell. WebShell used by the threat actor (3) This WebShell is a well-known WebShell that has been frequently used since the past like WebShell. 5，兼容性较之前的版本 Behinder_v4. 一键展示命令与返回结果的配对 Behinder Webshell: The Revelation of Volexity’s Heap. The China Chopper webshell was written to a web directory that was publicly available. Contribute to rebeyond/Behinder development by creating an account on GitHub. Contribute to ngductung/wellsheb development by creating an account on GitHub. Exception：不再支持源选项7。请使用8或者更高版本。 因为演示的是jsp的部分，就去修改net. NET with an exceptionally small footprint (about 6Kb compiled). webshell memshell behinder-memshell jetty-memshell tomcat-memshell weblogic-memshell jboss-memshell websphere-memshell spring-memshell Updated Nov 6, 2020; Java; Improve this page Add a description, image, and links to the behinder-memshell topic page so that developers can more easily learn about it. - pen4uin/java-memshell-generator Skip to content Navigation Menu Who is Behinder the intrusion? We do not have enough evidence to confidently attribute the intrusion to a known threat actor group. This is a webshell collection project. Host and manage packages Security. 1 【tools专版】 Java 21. 11 Webshell password Brute Script(Only Jsp/Jspx) - Arrnitage/BehinderBrute For example, Behinder, a famous webshell manage tool implements a one-sentense jsp webshell via defineClass. py This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. Detecting webshells is a key security concern for website YARA Rules I come across on the internet. DecodeBase64 is applied to the matching text, the system will first remove the following items " and '. Skip to content Navigation Menu Toggle navigation Sign in Product GitHub Copilot Write better code with AI Security 2020年，Behinder（冰蝎） v3. ) To recover attacker instructions from network traffic requires recovery of the hardcoded pre-shared key from the web shell script. You signed in with another tab or window. 免杀webshell生成器 Webshell Generate，使用jdk8开发出了几个简单功能用来管理webshell。页面比较low。 工具整合并改写了各类webshell，支持各个语言的cmd、蚁剑、冰蝎、哥斯拉，又添加了实际中应用到的一些免杀技巧，以方便实际需要。 behinder 访问404为正常使 录制视频不易，还请各位客官一键三连奥工具及网络安全学习籽料，评论区自取即可, 视频播放量 338、弹幕量 5、点赞数 101、投硬币枚数 0、收藏人数 3、转发人数 9, 视频作者 白帽有话说, 作者简介 ，相 You signed in with another tab or window. In this case, BEFORE the function cm. 0 简介 冰蝎是一款基于 Java 开发的动态加密通信流量的新型 Webshell 客户端。老牌 Webshell 管理神器——中国菜刀的攻击流量特征明显，容易被各类安全设备检测，实际场景中越来越少使用，加密 Webshell 正变得日趋流行。 由于通信流量被加密，传统的 WAF、IDS Saved searches Use saved searches to filter your results more quickly sid类型： 0~1000000 Sourcefire VRT 保留 2000001~2999999 EMerging Threats(ET) 3000000~3999999 公用 网络扫描 3000000～3000999 暴力破解 3001000～3001999 漏洞利用 3002000～3002999 后门链接 3003000～3003999 WebShell 3004000～3004999 病毒木马 3005000～3005999 间谍软件 3006000～3006999 安全认证 3007000～3007999 代码执行 Behinder_v4. Behinder_v4. Requires Cmd. Curate this 冰蝎Java WebShell自动化免杀生成. When WebShell is installed in a system, it can maintain persistence and control the system. misc. php). Contribute to yusinomy/Webshell-Generate development by creating an account on GitHub. Compatible with various Containers, Components, Encoder, WebShell / Proxy / Killer and Management C Msmap is a Memory WebShell Generator. 2. Toggle navigation. Sophos Firewall 0day used for webshell drop. BASE64Decoder(). 收集JSP Webshell的各种姿势 - threedr3am/JSP-WebShells 冰蝎 4. vietnam national university hanoi university of engineering and technology le viet ha enhancing webshell detection with deep learning-powered methods 记录自己研究的一些的免杀一句话webshell（根据免杀的引擎分别记录）. Contribute to Suki1i1i/Bypass_Webshell development by creating an This is a webshell open source project. t00ls版本启动报错，java版本： java version "1. However, a review of the web logs showed that the file had barely been accessed. Sign in Product You must use the options -f Filename If OS is windows , cmd code page must be 'chcp 936' The Behinder default key = e45e329feb5d925b You signed in with another tab or window. 一款支持自定义的 Java 内存马生成工具｜A customizable Java in-memory webshell generation tool. Skip to content. Godzilla Webshell Behinder NAPLISTENER SiestaGraph REF2924 ×. Compatible with various Containers, Components, Encoder, WebShell / Proxy / Killer and Management Clients. Name Type Description Attribution First Seen Behinder Webshell Behinder is a webshell developed by Chinese actor. Curate this topic WebShell. Contribute to intbjw/webshell-decryptor development by creating an account on GitHub. Contribute to Tas9er/ByPassBehinder4J development by creating an account on GitHub. Please select any available option. g(c. 添加环境： Java 11. Contribute to Freakboy/Behinder development by creating an account on GitHub. Contribute to cseroad/Webshell_Generate development by creating an account on GitHub. a(Unknown Source) at org. t00ls在macos上运行报错java. Sign in Product GitHub Copilot. Instant dev environments webshell memshell behinder-memshell jetty-memshell tomcat-memshell weblogic-memshell jboss-memshell websphere-memshell spring-memshell Updated Nov 6, 2020 Java Behinder_v4. Avento/CVE-2024-45507_Behinder_Webshell . S Security Team 。最近我也用到了这个项目，所以在这里给大家推荐下。项目地址：0x01 风险概述本工具仅限授权安全测试使用,禁止非法攻击未授权站点0x02 风险概述0x03 使用教程使用者无需关心免杀实现，只需要在Windows x64位系统运行即可 整理制作不易，大家记得点个关注，一键三连呀【点赞、收藏、转发】感谢支持~ 本视频目的只用于观看， 切勿使用视频中的技术进行违法活动，， 倡导维护网络安全人人有责！, 视频播放量 98、弹幕量 0、点赞数 1、投硬币枚数 0、收藏人数 0、转发人数 0, 视频作者 安全苕皮, 作者简介 收徒中，想 Bypass EDR(Endpoint Detection and Response) environment to write Behinder jsp webshell onto webserver. You switched accounts on another tab or window. Follow their code on GitHub. U/OO/134094-20 PP-20-0901 21 APRIL 2020 . t00ls版本启动报错+1 #284. This indicates an attempt to use Behinder web shell. Function. Behinder web shell sample. 也叫做webshell管理工具，第一代webshell管理工具"菜刀"的流量特征非常明显，很容易被安全设备检测到。所以"冰蝎"应运而生。 冰蝎（behinder）客户端基于JAVA，冰蝎（behinder）兼容jdk范围为jdk6-jdk8，可以跨平台使用，最新版本为v4. 支持 pcap、pcapng 等格式. 0. 20 JavaFX 17. 11, 2024, 7:14 a. 0_25" Java(TM) SE Runtime Environment (build 1. Contribute to DonTom1/Behinder_webshell development by creating an account on GitHub. 9. Collect JSP webshell of various implementation methods. Attacker input is shaped by the Behinder client to be a valid class written in the syntax of the target web server, in this case PHP. getClassLoader()). m. Compatible with various Containers, Components, Encoder, WebShell / Proxy / Killer and Management Clients Contribute to Avento/CVE-2024-45507_Behinder_Webshell development by creating an account on GitHub. 0版本更新中内置了Java内存马注入功能，此次更新利用self attach技术，将植入过程由上文中的3个步骤减少为2个步骤： 上传agent. NET默认支持AES，php中需要开启openssl扩展，在V2. GitHub Gist: instantly share code, notes, and snippets. Three webshells, such as JSP file Browser, Shack2, and Behinder, were deployed. Download link: https://github. The second-stage webshell is Behinder[6], a famous open-source webshell in Chinese threat actors. 2023-02 Msmap is a Memory WebShell Generator. Contribute to ca01h/WebShell-Traffic-Dataset development by creating an account on GitHub. penetration-testing poc getshell csrf penetration-testing-poc csrf-webshell cve rce sql-poc poc-exp bypass oa-getshell cve-cms php-bypass thinkphp sql-getshell authentication-bypass cobalt You signed in with another tab or window. Instant dev environments You signed in with another tab or window. A curated collection of webshells for various platforms, including PHP, ASP, JSP, and more. rebeyond. 用于解密Behinder（冰蝎）webshell流量的Python工具。它能够分析pcap文件，解密并格式化Behinder的HTTP请求和响应数据。 - ba0gu0/behinder-decryptor The second-stage webshell is Behinder[6], a famous open-source webshell in Chinese threat actors. Curate this topic webshell_detect. You signed out in another tab or window. Contribute to 4nth0ny1130/spring4shell_behinder development by creating an account on GitHub. php from the official client jar. payload. This repository provides a comprehensive and organized list of webshells used for testing, penetration testing, or educational purposes - XiaomingX/awesome-webshell ByPassBehinder冰蝎WebShell免杀生成工具，代码作者： Tas9er@A. A web shell is a malicious script, acting as a backdoor, that can be uploaded to a web server t Search. io. 0_25-b18) Java HotSpot(TM) 64-Bit Server VM (build 25. php_cmd. com/rebeyond/Behinder/releases. Select Content. Write better code with AI Security. How to use by video: The analysis of the article "Red and Blue Confrontation-Encrypted Webshell "Behinder" Traffic 100% Recognition" notes that a characteristic problem of the Cookie header when the old version of Behinder sends a “冰蝎”动态二进制加密网站管理客户端. 11 Webshell password Brute Script(Only Jsp/Jspx) - Arrnitage/BehinderBrute. Next, the adversary uploaded a ZIP archive containing the BEHINDER JSP web shell from the administrative panel's "branding" page. Superhero-zero opened this issue Sep 13, 2023 · 11 comments Comments. Several other tools have novel characteristics or have not been 用于解密Behinder（冰蝎）webshell流量的Python工具。它能够分析pcap文件，解密并格式化Behinder的HTTP请求和响应数据。 - ba0gu0/behinder-decryptor CVE-2022-22965写入冰蝎webshell脚本. The heap included many Java classes and code snippets, including process spawning, dynamic Godzilla Webshell Behinder NAPLISTENER SiestaGraph REF2924 ×. pentest webshell bypass-antivirus behinder. Automate any workflow Packages. Find and fix 冰蝎介绍 Webshell管理工具，动态二进制加密网站客户端。流量动态加密，攻击特征安全设备（WAF、WebIDS）难以检测。 冰蝎通信过程中使用AES（高级加密算法，对称加密，微信小程序使用此种方法）进行加密，Java和. Behinder_v3. the attacker immediately deployed an in-memory 用于生成各类免杀webshell. Behinder is a new type of dynamic binary encryption website tool. The large amount of customers’ personally identifiable information the victim held was of likely interest to financially and politically-motivated threat actors alike. Behinder web shell accepts attacker input from HTTP POST requests. On February 13, 2023, we observed a new persistent malware called kavUpdate. 第6课：解密分析冰蝎Webshell的攻击流量（分析请求包、返回包）, 视频播放量 1343、弹幕量 1、点赞数 35、投硬币枚数 12、收藏人数 65、转发人数 6, 视频作者 希水涵一讲堂, 作者简介 ，相关视频：第1 Web木马常用工具有三个：冰蝎（Behinder 3. java下面的Java代码文件，找到里面的Encrypt()函数（payload里的Java代码，挨个找找改一下，并不是每一个文件都有Encrypt，这里没有就不管），去修改加密逻辑就行了 Attacker input is shaped by the Behinder client to be a valid class written in the syntax of the target web server, in this case PHP. Raw. Give someone a rose, there is a fragrance in your hand if you download this project, please also submit a shell 通过获取到的webshell流量、url、key来还原攻击者使用webshell所做的操作。. BEHINDER . Webshell && Backdoor Collection. There are mainly three approaches for detecting webshell’s network traffic on Behinder, a Java-based webshell, uses dynamic encryption, making detection difficult. Navigation Menu Toggle navigation. Give someone a rose, there is a fragrance in your hand if you download this project, please also submit a shell CVE-2022-22965写入冰蝎webshell脚本. 8. asm. py Java Tomcat Valve AES128 Behinder rebeyond. Exception,不再支持源选项7。 请使用8或更高版本 #308 opened Nov 26, 2024 by JuJu0225 You signed in with another tab or window. Contribute to czz1233/GBByPass development by creating an account on GitHub. A webshell for multiple web languages (asp/aspx, jsp/jspx, php), openly distributed through Github. com 前言 感觉冰蝎流量魔改的文章比较少，我自己琢磨了一下，感觉简单地做个流量魔改并不复杂，发出来供大家参考。我自己是个Java笨比，有问题的地方欢迎大佬们评论区指正共同学习。 正文 0x00 冰蝎源码 冰蝎源码的 Contribute to yusinomy/Webshell-Generate development by creating an account on GitHub. Msmap is a Memory WebShell Generator. UnsupportedClassVe Behinder_v4. Persistence module. 也叫做webshell管理工具，第一代webshell管理工具"菜刀"的流量特征非常明显，很容易被安全设备检测到。所以"冰蝎"应运而生。 冰蝎（behinder）客户端基于JAVA，冰蝎（behinder）兼容jdk范围为jdk6-jdk8， 基于 ctf 面向 realworld 的 webshell 流量包分析解密工具. webshell manager libraries | 网站管理工具. WebShell The threat actor used WebLogic vulnerabilities such as CVE-2020-14882 to upload JSP WebShell. Opensource webshell, godzilla,antsword,behinder bypass webshell - devexpshell/aspx-shell 用于解密Behinder（冰蝎）webshell流量的Python工具。它能够分析pcap文件，解密并格式化Behinder的HTTP请求和响应数据。 - ba0gu0/behinder-decryptor. All gists Back to GitHub Sign in Sign up Sign in Sign up You signed in with another tab or window. Dynamic Menu; Automatic Compilation; Generate Script; Lite Mode; Graphical Interface After initial access via Log4Shell, the actor dropped the Behinder web shell on the victim’s public-facing web servers. MSMAP是一款功能强大的内存WebShell生成工具，该工具提供了各种容器、组件、编码器、WebShell、代理和管理客户端等工具，可以帮助广大研究人员更好地生成、管理和使用WebShell。 工具功能 1、动态菜单 2、自动补全 3 0x00 前言 冰蝎v4. Groovy Updated: 3 months, 3 weeks ago . 0开放了传输协议的自定义功能，使得流量魔改更为简单方便，本文以jsp脚本类型为例，提供一些冰蝎4流量魔改的方式 0x01传输协议分析 冰蝎4内置了如下几种传输协议，传输协议可以理解为流量的加密方式 以 (3) 冰蝎（Behinder） 冰蝎是一款基于Java开发的动态二进制加密通信流量的新型Webshell客户端，由于它的通信流量被加密，使用传统的WAF、IDS等设备难以检测，目前在HVV中使用较多的一款工具。项目地址： https://github. 0版本后，php环境方式根据服务端支持 For example, Behinder, a famous webshell manage tool implements a one-sentense jsp webshell via defineClass. Updated Dec 27, 2023; Python; Improve this page Add a description, image, and links to the behinder topic page so that developers can more easily learn about it. getClass(). . 0传输协议详解 相关截图 演示视频 相关说明 需要使用带JAVA FX 冰蝎 哥斯拉 WebShell bypass. This repository provides a comprehensive and organized list of webshells used for testing, penetration testing, or educational purposes - XiaomingX/awesome-webshell Behinder_v3. 用于解密Behinder（冰蝎）webshell流量的Python工具。 The most common one found during the test runs was the ‘Behinder’ dynamic webshell, where the JSP version implemented the eval feature by customizing the ClassLoader + defineClass methods. kgzngfko envne qtbqnhfn kvz ihccvs uejwmnw zeg xfvjv lyscs ibfudl