WORM
A type of virus that does not need a host program. It has the ability to self-replicate and often will use email and the internet to spread.
BACKDOOR
a means of access to a computer program that bypasses security mechanisms. A programmer may sometimes install a back door so that the program can be accessed for troubleshooting or other purposes, but an attacker may exploit or use a back door to get unauthorized access to information or install spyware.
IRC_BOT
Connects to an IRC (Internet Relay Chat) server and recieves commands from an external source. Can allow unwanted access to a user's system.
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