First of all ,Thanks for missing me .Now here's a post on viruses/virii


VIRUS......... stands for Virus [edit: Vital] Information Resources Under Seize
A typical virus takes control of the OS and when the infected sys. comes in contact with another ,the virus passes on .

the very first commercial application of viruses was floated in '85 when two pakistani bros.introduced the brain virus to keep track of software piracy of some software they used to sell at Lahore.

Types of viruses/virii

>Boot sector virus

>file virus

>logic bombs

>time bombs

>trojans

The boot sector virus

resides in the boot sector(0th sector of 0th trackof the disk where your system files reside ).they will enter through an infected disk while booting and then damage directory structures , fat , and the hard disk partition table .Ever heard of marijuna??

File virus

this will attach itself to .com ,.exe,.sysoe ovl files . thereby changing host file commands and increse the file size during each operation untill you get "Program too big to fit in memory" lol .
they may also change dos fxns. Just imagine you write a copy thing and the dos will delete something . raindrops? happy birthday 30th?

Worms

this is an independent program threads through comp. memory and n/w , altering data records and programs .And guess what you cant award negs to get it banned
whorms have been known to damage and infect entire LANs. they will occupy hosts memory and slow down the system , the affected program still continues runin' with potentially very dangerous effects .

logic and time bombs

are modifications made to some existing program generally by malicious employees and are activated or exploded by some particular conditions .
malfunction the program .


Trojans

i posted one on trojans earlier .