The output is saved to payload.bin , which you can then send to the vulnerable parameter or network stream of the target application. Common Payload Types and Gadget Chains
Use an open-source library like SerialKiller or Java's native ObjectInputFilter to validate classes before they are deserialized. download ysoserial.jar
To generate a payload that opens a calculator application on a vulnerable Windows target, use: The output is saved to payload
If you are auditing an application and want to check for a deserialization vulnerability without crashing the system or running dangerous commands, use the gadget chain. It forces the target server to perform a DNS lookup to a domain you control (such as a Burp Suite Collaborator client). java -jar ysoserial.jar URLDNS "oastify.com" > dns_test.bin Use code with caution. How to Mitigate Java Deserialization Risks It forces the target server to perform a
The absolute best place to is directly from the official ysoserial GitHub Repository releases page . Because this tool generates active exploits, downloading pre-compiled binaries from unofficial, third-party mirrors poses a massive security risk, as they frequently contain malware or backdoors designed to compromise your machine. What is Ysoserial?