Malware is defined as a software designed to perform an unwanted illegal act via the computer network. It could be also defined as software with malicious intent.
Malware can be classified based on how they get executed, how they spread, and/or what they do. Some of them are discussed below.
- Virus: A program that can infect other programs by modifying them to include a possible evolved copy of itself.
- Worms: Disseminated through computer networks, unlike viruses, computer worms are malicious programs that copy themselves from system to system, rather than infiltrating legitimate files.
- Trojans: Trojan or trojan horse is a program that generally impairs the security of a system. Trojans are used to create back-doors (a program that allows outside access into a secure network) on computers belonging to a secure network so that a hacker can have access to the secure network.
- Hoax: An e-mail that warns the user of a certain system that is harming the computer. The message thereafter instructs the user to run a procedure (most often in the form of a download) to correct the harming system. When this program is run, it invades the system and deletes an important file.
- Spyware: Invades a computer and, as its name implies, monitors a user’s activities without consent. Spywares are usually forwarded through unsuspecting e-mails with bonafide e-mail i.ds. Spyware continues to infect millions of computers globally.