March 15, 2014
How to Create a Virus to Block Websites
Most
of us are familiar with the virus that used to block Orkut and Youtube
websites. If you are curious about creating such a virus on your own,
here is how it can be done.
As usual I am using my favorite programming language ‘C’ to create this website blocking virus. I will give a brief introduction about this virus before I jump into the technical jargon.
This virus has been exclusively created in ‘C’.
So, anyone with a basic knowledge of ‘C’ will be able to understand the
working of this virus program. When this program is executed, it will
block all those websites that are listed in the source code. In the
following example, the sites that are listed in the source code are
Google, Yahoo and Youtube. When you download the source code of this
program, you have a choice to include your own list of sites that you
want this virus to block.
I have just removed the source code of
this program from this post as it is lengthy and makes the post look
messy. You can still download the source code of this virus program from
the following link:
How Virus Program Works?
The Windows operating system maintains a
special file called HOSTS which can be used to block any given hostname
or domain name (website) by adding new entries onto it. This program
works by modifying the HOSTS file by adding new entries of those sites
that are intended to be blocked. The HOSTS file is located at:
%windir%\system32\drivers\etc (Usually: C:\windows\system32\drivers\etc)
So, when you execute this program, all
it does is add the entries of the list of those sites (mentioned in the
source code) to this HOSTS file. Once this is done, the site will be
blocked from your computer. So, none of the browsers would be able to
load those sites on your computer.
For more information on HOSTS file, I recommend reading my other post on How to use HOSTS file to block websites.
Now, as far as the technical part of
this program is concerned, people who have a working knowledge of ‘C’
should be easily able to understand the working of this virus program.
However, for those who are new to ‘C’ programming, here is the algorithm
of this program:
- Determine the Root drive. ie: Find the drive (C:, D:, E: or F:) on which the Windows is installed.
- Navigate to: %windir%\system32\drivers\etc
- Open/Load the HOSTS file.
- Copy a list of those websites that are mentioned in the ARRAY to the END of the file.
- Save the file and Exit.
How to Compile the Source Code?
For a step-by-step compilation guide, refer my post: How to compile C Programs?
Testing the Virus:
-
To test, run the compiled module. It will block the sites that are listed in the source code.
-
Once you run the file block_Site.exe, restart your browser program. Then, type the URL of the blocked site and you’ll see the browser showing error “Page cannot displayed“.
-
To remove the virus type the following command in the Run.%windir%\system32\drivers\etc
-
There, open the file named “hosts” using the notepad. At the bottom of the opened file you’ll see something like this:127.0.0.1 google.com
-
Delete all such entries which contain the names of blocked sites.
