chayao2015's repositories
access
Access without a real handle
Algorithm
《剑指Offer》，《程序员代码面试指南》，Leetcode等算法题目集合。基于.net core的控制台程序，C#实现，包含每道题目的完整描述，多种解法AC代码，以及解题思路，所有题目均可直接运行以查看输出结果。常用算法汇总中每个算法同样有测试用例，可运行。
AutoHotkey
AutoHotkey is a powerful and easy to use scripting language for desktop automation on Windows.
Box2DSharp
A C# port of Box2D
CSpider
A scalable and convenient crawler framework in C:).
dlua
类似gdb的lua调试器。Lua debugger like gdb
EGamePlay
一个基于Entity-Component模式的灵活、通用的战斗（技能）框架，配置使用基于Odin的ScriptableObject，async-await使用ETTask
Game-Cheating-Tutorial
热门网络游戏辅助开发教程
haywire
Haywire is an asynchronous HTTP server framework written in C that's built using the event loop based libuv platform layer that node.js is built on top of.
huoqugorgonx-gorgonjiamisuanfa
抖音协议抖音爬虫获取 init_gorgon()、x-gorgon加密算法
jd_seckill
京东秒杀商品抢购，目前只支持茅台抢购，不支持其他商品！
lua-lockbox
A collection of cryptographic primitives written in pure Lua
memory-db
内存数据库，采用B+树加速查找
MissingReferencesUnity
A Unity editor extension for finding missing object references
modern-cpp-tutorial
📚 Modern C++ Tutorial: C++11/14/17/20 On the Fly
moon
A cross-platform,lightweight,scalable game server framework written in C++, and support Lua Script
NewProxy
调用netfilter2驱动实现指定进程的代理，也可作为游戏加速器。可以自己添加代理IP，支持代理任何进程，支持完整的IPv4和IPv6，支持SOCKS5、Shadowsocks代理ip，支持TCP、UDP协议。兼容全部Windows系统 XP/2003/2008/2012/Vista/7/8/10 x86/x64&VMware、VirtualBox、Hyper-V，同时兼容各种安卓模拟器。
Nice-Lua
基于xlua的MVVM框架，支持Addressables, 统一渲染管线等Unity新特性
Nice-TS
基于puerts的Unity游戏框架，集成fairygui，protobufjs并采用addressables管理资源
origin
A game server framework in Go (golang).
PVZ
植物大战僵尸Qt版
r0capture
安卓应用层抓包通杀脚本
ransomware
Project Summary This project was developed for the Computer Security course at my academic degree. Basically, it will encrypt your files in background using AES-256-CTR, a strong encryption algorithm, using RSA-4096 to secure the exchange with the server, optionally using the Tor SOCKS5 Proxy. The base functionality is what you see in the famous ransomware Cryptolocker. The project is composed by three parts, the server, the malware and the unlocker. The server store the victim's identification key along with the encryption key used by the malware. The malware encrypt with a RSA-4096 (RSA-OAEP-4096 + SHA256) public key any payload before send then to the server. This approach with the optional Tor Proxy and a .onion domain allow you to hide almost completely your server. Features Run in Background (or not) Encrypt files using AES-256-CTR(Counter Mode) with random IV for each file. Multithreaded. RSA-4096 to secure the client/server communication. Includes an Unlocker. Optional TOR Proxy support. Use an AES CTR Cypher with stream encryption to avoid load an entire file into memory. Walk all drives by default. Docker image for compilation. Building the binaries DON'T RUN ransomware.exe IN YOUR PERSONAL MACHINE, EXECUTE ONLY IN A TEST ENVIRONMENT! I'm not resposible if you acidentally encrypt all of your disks! First of all download the project outside your $GOPATH: git clone github.com/mauri870/ransomware cd ransomware If you have Docker skip to the next section. You need Go at least 1.11.2 with the $GOPATH/bin in your $PATH and $GOROOT pointing to your Go installation folder. For me: export GOPATH=~/gopath export PATH=$PATH:$GOPATH/bin export GOROOT=/usr/local/go Build the project require a lot of steps, like the RSA key generation, build three binaries, embed manifest files, so, let's leave make do your job: make deps make You can build the server for windows with make -e GOOS=windows. Docker ./build-docker.sh make Config Parameters You can change some of the configs during compilation. Instead of run only make, you can use the following variables: HIDDEN='-H windowsgui' # optional. If present the malware will run in background USE_TOR=true # optional. If present the malware will download the Tor proxy and use it to contact the server SERVER_HOST=mydomain.com # the domain used to connect to your server. localhost, 0.0.0.0, 127.0.0.1 works too if you run the server on the same machine as the malware SERVER_PORT=8080 # the server port, if using a domain you can set this to 80 GOOS=linux # the target os to compile the server. Eg: darwin, linux, windows Example: make -e USE_TOR=true SERVER_HOST=mydomain.com SERVER_PORT=80 GOOS=darwin The SERVER_ variables above only apply to the malware. The server has a flag --port that you can use to change the port that it will listen on. DON'T RUN ransomware.exe IN YOUR PERSONAL MACHINE, EXECUTE ONLY IN A TEST ENVIRONMENT! I'm not resposible if you acidentally encrypt all of your disks! Step by Step Demo and How it Works For this demo I'll use two machines, my personal linux machine and a windows 10 VM. For the sake of simplicity, I have a folder mapped to the VM, so I can compile from my linux and copy to the vm. In this demo we will use the Ngrok tool, this will allow us to expose our server using a domain, but you can use your own domain or ip address if you want. We are also going to enable the Tor transport, so .onion domains will work without problems. First of all lets start our external domain: ngrok http 8080 This command will give us a url like http://2af7161c.ngrok.io. Keep this command running otherwise the malware won't reach our server. Let's compile the binaries (remember to replace the domain): make -e SERVER_HOST=2af7161c.ngrok.io SERVER_PORT=80 USE_TOR=true The SERVER_PORT needs to be 80 in this case, since ngrok redirects 2af7161c.ngrok.io:80 to your local server port 8080. After build, a binary called ransomware.exe, and unlocker.exe along with a folder called server will be generated in the bin folder. The execution of ransomware.exe and unlocker.exe (even if you use a diferent GOOS variable during compilation) is locked to windows machines only. Enter the server directory from another terminal and start it: cd bin/server && ./server --port 8080 To make sure that all is working correctly, make a http request to http://2af7161c.ngrok.io: curl http://2af7161c.ngrok.io If you see a OK and some logs in the server output you are ready to go. Now move the ransomware.exe and unlocker.exe to the VM along with some dummy files to test the malware. You can take a look at cmd/common.go to see some configuration options like file extensions to match, directories to scan, skipped folders, max size to match a file among others. Then simply run the ransomware.exe and see the magic happens 😄. The window that you see can be hidden using the HIDDEN option described in the compilation section. After download, extract and start the Tor proxy, the malware waits until the tor bootstrapping is done and then proceed with the key exchange with the server. The client/server handshake takes place and the client payload, encrypted with an RSA-4096 public key must be correctly decrypted on the server. The victim identification and encryption keys are stored in a Golang embedded database called BoltDB (it also persists on disk). When completed we get into the find, match and encrypt phase, up to N-cores workers start to encrypt files matched by the patterns defined. This proccess is really quick and in seconds all of your files will be gone. The encryption key exchanged with the server was used to encrypt all of your files. Each file has a random primitive called IV, generated individually and saved as the first 16 bytes of the encrypted content. The algorithm used is AES-256-CTR, a good AES cypher with streaming mode of operation such that the file size is left intact. The only two sources of information available about what just happen are the READ_TO_DECRYPT.html and FILES_ENCRYPTED.html in the Desktop. In theory, to decrypt your files you need to send an amount of BTC to the attacker's wallet, followed by a contact sending your ID(located on the file created on desktop). If the attacker can confirm your payment it will possibly(or maybe not) return your encryption key and the unlocker.exe and you can use then to recover your files. This exchange can be accomplished in several ways and WILL NOT be implemented in this project for obvious reasons. Let's suppose you get your encryption key back. To recover the correct key point to the following url: curl -k http://2af7161c.ngrok.io/api/keys/:id Where :id is your identification stored in the file on desktop. After, run the unlocker.exe by double click and follow the instructions. That's it, got your files back 😄 The server has only two endpoints: POST api/keys/add - Used by the malware to persist new keys. Some verifications are made, like the verification of the RSA autenticity. Returns 204 (empty content) in case of success or a json error. GET api/keys/:id - Id is a 32 characters parameter, representing an Id already persisted. Returns a json containing the encryption key or a json error The end As you can see, building a functional ransomware, with some of the best existing algorithms is not difficult, anyone with some programming skills can build that in any programming language.
SceneKeeper
A simple tool that keeps your scene state (Hierarchy/Selection) exactly as you left in between switching scenes on editor or play mode.
ScreenCapture
A DirectX hardware video + audio capture with mixing capabilities and Media Foundation file encoding (Windows 8+)
Titan
Titan framework meant for dissecting various games that I like.
tpl
tpl - a small binary serialization library for C
VirtualApp
Virtual Engine for Android(Support 11.0 in business version)