Mr. Parimal Panchal
 FYMCA, Student

Malware, comes from the words malicious and software, is software designed to infiltrate or damage a computer system without the owner's informed. The expression is a general term used by computer professionals to mean a variety of forms of hostile, intrusive, or annoying software or program code. The term "computer virus" is include all types of malware, including true viruses.

Types of Malware:

1. Virus
2. Worm
3. Trojan Horse
4. Root Kit
5. Spyware

1. Virus:

The term virus (vital information resource under size) is used for a program written by a computer programmer which has infected some executable software and which causes that software, when run, to spread the virus to other executable software. Viruses may also contain a payload which performs other actions, often malicious.The purpose of virus is the writer's need for bandwidth, CPU control, data and remote access.Basic virus purpose is to only destroy the data.

2. Worm:

Worm is also a virus but automatically transmits itself over a network to infect other computers. It too may carry a payload. Worm is more powerful and harmful and worm automatically infects system software. The main purpose to write worm is to use bandwidth and CPU and hang network services.

3. Trojan Horse:

Trojan horse is also a type of virus which is used to control remote machine without system owner knowledge. Trojan has two parts: 1. Server 2. Client.
Server handles all infected remote computers' connections and client is used to infect victim computer system. Every Trojan has its associated port number for communication over internet or LAN.

4. Root Kit:

Root kit is also a virus like Trojan for remote access of any system. Root kit is very powerful as compared to Trojan because root kit implements on kernel level of any operating system, which is hard to detect and delete. Root kit is invisible in task manager as it hides itself.

5. Spyware:

Spyware is computer software that is installed surreptitiously on a personal computer to collect information about a user, their computer or browsing habits without the user's informed consent. While the term spyware suggests software that secretly monitors the user's behavior, the functions of spyware extend well beyond simple monitoring. Spyware programs can collect various types of personal information, such as Internet surfing habits and sites that have been visited, but can also interfere with user control of the computer in other ways, such as installing additional software and redirecting Web browser activity.

Book Reference:
=>The Secret of Hacking