Computer virus

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By Shaharyar Khan
shaharyar.khan555@gmail.com

 Computer viruses are small software programs that are
designed to spread from one computer to another and to
interfere with computer operation.
 The term "virus" is also commonly, but erroneously, used to
refer to other types of malware, including but not limited to
adware and spyware programs that do not have a
reproductive ability.
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 Brain is the industry standard name for a computer virus
that was released in its first form in January 1986
 It is considered to be the first computer virus for MS-DOS. It
infects the boot sector of storage media formatted with the
DOS File Allocation Table (FAT) file system
 Brain was written by two brothers, Basit Farooq Alvi and
Amjad Farooq Alvi from Lahore, Pakistan
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 Malware includes computer viruses, computer worms,
ransomware, trojan horses, keyloggers, most rootkits,
spyware, dishonest adware, malicious BHOs and other
malicious software
 The majority of active malware threats are usually trojans or
worms rather than viruses
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Some most common electronic infections are:
Viruses: A virus is a small piece of software that piggybacks
on real programs. For example, a virus might attach itself to a
program such as a spreadsheet program. Each time the
spreadsheet program runs, the virus runs, too, and it has the
chance to reproduce (by attaching to other programs) or wreak
havoc.
E-mail viruses: An e-mail virus travels as an attachment to e-
mail messages, and usually replicates itself by automatically
mailing itself to dozens of people in the victim's e-mail address
book. Some e-mail viruses don't even require a double-click --
they launch when you view the infected message in the
preview pane of your e-mail software
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 Trojan horses: A Trojan horse is simply a computer
program. The program claims to do one thing (it may claim
to be a game) but instead does damage when you run it (it
may erase your hard disk). Trojan horses have no way to
replicate automatically.
 Worms: A worm is a small piece of software that uses
computer networks and security holes to replicate itself. A
copy of the worm scans the network for another machine
that has a specific security hole. It copies itself to the new
machine using the security hole, and then starts replicating
from there, as well.
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 Malware such as trojan horses and worms is sometimes
confused with viruses, which are technically different
 a worm can exploit security vulnerabilities to spread itself
automatically to other computers through networks, while a
trojan horse is a program that appears harmless but hides
malicious functions. Worms and trojan horses, like viruses,
may harm a computer system's data or performance.
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 Here now I will create a fake virus in Java for demo
 For creating this demo , you need to install jdk , jre and any
java editor like eclipse or netbeans
 Even you can write this in notepad and compile it from
command propmt
 Let have some fun 
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 Robot class gives us functionality to control over mouse.
 I will create a virus in which a mouse can get mad :p
 Robot class have a function mouseMove(x,y) which needs x
and y location (screen coordinates) and then it move the
mouse at that location.
 We will just write a infinite loop which will continuously
changes the location of mouse and our control on mouse will
not remain
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 Here is the function
public void mentalMouse() throws Exception{
Robot r = new Robot();
Random randomGenerator = new Random();
Random randomGenerator1 = new Random();
for(double a=0;a<100000;a++){
int x = randomGenerator.nextInt(1000);
int y = randomGenerator1.nextInt(1000);
r.mouseMove(x,y);
}
I limit this loop to 100000, so it get stop after few seconds. If you
are naughty enough then You can replace this by while(1)
:D :D :D 10

 In that function
I have created a Robot class object
Then generate two random numbers
And then set the location of the mouse with these two
numbers by r.mouseMove(x,y);
 In next slide you will find the whole class
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import java.awt.Robot;
import java.util.Random;
public class Ewien {
public void mentalMouse() throws Exception {
Robot r = new Robot();
Random randomGenerator = new Random();
Random randomGenerator1 = new Random();
for (double a = 0; a < 100000; a++) {
int x = randomGenerator.nextInt(1000);
int y = randomGenerator1.nextInt(1000);
r.mouseMove(x, y);
}
}
public static void main(String[] args) {
try {
new Ewien().mentalMouse();
} catch (Exception e) {
e.printStackTrace();
}
}
}

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