While version 0.0.4 is quite old (dating back to 2016), you can find it and more recent releases on the Official ysoserial GitHub Repository . ysoserial-0.0.4-all.jar

Because pre-compiled JAR files (especially older versions like 0.0.4) found on third-party sites can be backdoored or tampered with, the "helpful" way to obtain it is by building it yourself or using the official release. Official Repository : The project is maintained on GitHub by frohoff/ysoserial Building from Source : This is the safest method. You will need installed: Clone the repo: git clone https://github.com Navigate to the folder: cd ysoserial Compile the "all" JAR: mvn clean package -DskipTests The file will be located in the directory as ysoserial-[version]-all.jar Common Usage Syntax

: Includes gadget chains for Apache Commons Collections (3.x and 4.x), Spring Beans/Core (4.x), and Groovy (2.3.x).

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java -jar ysoserial-0.0.4-all.jar CommonsCollections1 'calc.exe' > payload.bin Use code with caution.

To download the ysoserial-0.0.4-all.jar file, you should typically obtain it from the official GitHub repository or build it from source to ensure security and integrity. What is ysoserial?

: Supports a wide array of libraries (e.g., CommonsCollections, Groovy, Spring) to create serialized objects that execute arbitrary commands.

Because this tool can be used for both and malicious activity , it is important to understand what it is and how to handle it safely. What is ysoserial?