1. 蠕虫：
蠕虫类似于病毒，但它不会修改程序。它越来越多地自我复制，导致计算机系统变慢。蠕虫可以通过远程控制。蠕虫的主要目标是吃系统资源。
2. 间谍软件：
间谍软件是一种恶意软件，可以执行某些工作，包括监视和跟踪用户操作以及收集个人数据。间谍软件程序通常将自己安装在系统上，并在未经系统用户同意的情况下通过收集系统用户的数据向第三方提供利润。恶意间谍软件还试图通过在系统后台运行来捕获用户的密码和个人信息。
蠕虫和间谍软件的区别：
| WORMS | SPYWARE |
|---|---|
| A Worm is a form of malware that replicates itself and can spread to different computers via Network. | Spyware is a form of malware designed to collect your personal information. |
| The main objective of worms to eat the system resources. | The main objective of the spyware is to monitor the activity of the system. |
| Worms can be detected and removed by the Antivirus and firewall. | Spyware can be detected and removed by the anti-spyware program. |
| It doesn’t need a host to replicate from one computer to another. | It require host is needed for spreading. |
| It can give unauthorized access and control of the system to the hackers. | It provides profit to the third party by collecting data of user without his awareness. |
| It is less harmful as compared. | It is more harmful as compared. |
| Morris Worm, Storm Worm and SQL Slammer are some of the examples of worms. | Bonzibuddy, Cydore and Downloadware are some examples of spyware. |