Writing virus

Hi,
In our curriculam we studied about the various types of virus and the method Theoretically.But I want to know the coding part is there any tutorials/guides study about virus... I DONT WANT REAL VIRUS. A SIMPLE HARM LESS VIRUS. just explaing the replication / infection... /macro virus....

Thanks in advance,
-lok.

Virii can replicate many different ways. Look these up:

Mass mailers: Netsky and Bagle
Network aware: Sasser and Blaster
Server: Scob
Boot Sector: Diablo

For Trojans: Sub7, Diablo, Netcat

Other than that:
http://www.symantec.com/search/

If you wanna study the source code of some viruses to see the mthods used and the code used, here is a nice website with source codes !

http://www.62nds.co.nz/cgi-bin/x/e4015.html

Look on www.astalavista.com theres a few disassemblys of the major viruses to hit use all last year, there of course in ASM but If you clear your mind ASM becomes understandable.... I think someone reversed the blaster binary and produced a C representation of it, excluding the transmission code...I think

Since llot of the in-famous viruses are written in ASM, you might find if useful to disassemble some that u perhaps receive, I dunno whether your like me but I get sent the "sven" virus in my email all the time, so you could perhaps start with that, BUT DO IT ON A TEST COMPUTER THATS NOT CONNECTED TO THE INTERENET, THAT YOU DONT MIND FSCKING UP!

i2c