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Types of Malware
- Virus – A piece of code that replicates itself by attaching itself to another object. These objects can be files, like program files or documents, but they can be disk or file system structures as well, like the boot sector from a hard disk. Fun fact: the plural of virus is viruses, not virii.
- Worm – An independent program that replicates itself by copying itself from computer to computer, usually over a network or email attachments. Lately most outbreaks are worm related.
- Trojan horse – As the name implies a Trojan horse is a program that executes instructions that the user did not intend when (s)he opened it. These programs may arrive as an email attachment or website download and are usually disguised as a joke program or software utility like a screensaver.
- Blended threat – A new class of software that combines characteristics from viruses, trojans and worms to create extra-strong attacks. These attacks spread by targeting web servers and networks to get itself spread rapidly and cause extensive damage.
