How To Make Undetectable Virus

Bash Scripts are NOT viruses.
those are 'no-skill-need' tools for script kiddies.
virus-making is a little higher task.
only the people who interested in, can accomplish virus-making.
here is the very basic "helloworld" virus for example. 
so here is the trick to make a undetectable virus.
 
WARNING: Educational purposes only. 
[Also Read: How To Remove New Folder Virus]
 

###code starts here###
.model tiny
.code

ORG 100H

HOST:

mov ah,9 ;prepare to display message
mov dx,OFFSET HI ;address of message
int 21H ;display it with DOS

HI DB 'You have just released a virus, Have a nice day ;)$'

END HOST

###end of code section###

this is just writing 'You have just released a virus, have a nice day' to the screen and does nothing else.
Simply, this is how a computer virus looks like.
you will need an assembler for being able to assemble&link this code.
unfortunately its not a simple .bat file 
any usage is under users responsibility.

[Also Read: How To Remove Trojan Viruses]

Read More