An Introduction to malwares

Malware is a short form for malicious software. It consists of programming code designed to disrupt or deny operation, gather information that leads to loss of privacy, gain unauthorized access to system resources etc. Simply it is a software program that does many malicious things.
These Malwares include virus,worm,trojan,RAT,keyloggers etc.

Virus:
A computer virus is a computer program that can replicate itself and spread from one computer to another.  A true virus can spread from one computer to another when its host is taken to the target computer. For instance because a user carried it on a removable medium such as a USB drive.

Worm:
A computer worm is a self-replicating malware, which uses a computer network to send copies of itself to other computers on the network. It doesnt need any user intervention.A worm does not need to attach itself to an existing program. Worms always cause at least some harm to the network, even if only by consuming bandwidth.

Trojan Horse:
Trojan are used to get remote access to a target computer system. Once a Trojan has been installed on a target computer system,we may have access to the computer remotely and perform various operations, limited by user privileges on the target computer system and the design of the Trojan.

RAT:
A Remote Administration Tool (a RAT) is a piece of software that allows an operator to control a system as if he has physical access to that system. The operator controls the RAT through a network connection. It is very similar to trojans.

Keyloggers:
keyloggers are softwares which record every key stroke pressed by the user of a computer. They can perform many other things like taking screenshots,monitoring the system etc.

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