In computer security, a computer program or process that mimics the legitimate behavior of a normal system feature ( or other apparently useful function ), but performs malicious activities once invoked by the user.

• 在计算机保安技术中,一种计算机程序或进程,当用户调用它时,它模仿一个普通的系统特性(或一些其它有用的功能)的正常行为,但却执行着恶性的行动。