Malicious Invaders

All organisations and home users need to protect their networks from different types of threats. Some common threats are listed below.

Malicious invaders
There are two different types of attacks to your network; commonly defined as ‘targeted’ and ‘untargeted attacks’. A targeted attacked is when someone is specifically intending to invade a specific network where as an untargeted attack can be someone intending to attack any network or server.

Common types of attacks may include:

Virus’ - malicious code infecting the whole network but cannot spread without user intervention ( the code downloaded via another source)

Worms - similar to a virus except they can spread once initially downloaded without human intervention.

Trojans - may look like a useful piece of software but has an illegal function.

Can be downloaded as Malware that may lie dormant until user activated and then can destroy files, resources or provide access to resources from attacker.
A firewall may not defend against the above but can used in conjunction with other software (virus-scanning).

Denial of Service (DOS)

DOS attack causes the server to crash by sending unknown data that the host doesn’t know how to deal thus causing the server to be unable to deal with legitimate data. DOS attacks can be prevented if the appropriate firewall rules are applied.

Zombies – systems that have been previously attacked and controlled by attackers.

More information about malicious invaders and network security risks can be found here [http://vx.netlux.org/lib/mja01.html#c1]
(Aycock, J. 2006)

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