[EXTERNAL] Re: Retalitory DDoS

Mon Feb 8 18:06:13 UTC 2021

FYI, that looks like a Web Services Dynamic Discovery UDP amplification DDoS attack.  https://blogs.akamai.com/sitr/2019/09/new-ddos-vector-observed-in-the-wild-wsd-attacks-hitting-35gbps.html  Very easily executed by a booter service.
You may want to have your hosting provider block all inbound traffic from reaching your server IP except TCP port 443 (or 80 or whatever port you actually use) somewhere upstream.  This can help reduce the impact of DDoS attacks on your server.

-Rich

From: NANOG <nanog-bounces+rich.compton=charter.com at nanog.org> on behalf of Mike Hammett <nanog at ics-il.net>
Date: Monday, February 8, 2021 at 10:58 AM
To: Jean St-Laurent <jean at ddostest.me>
Cc: NANOG list <nanog at nanog.org>
Subject: [EXTERNAL] Re: Retalitory DDoS

CAUTION: The e-mail below is from an external source. Please exercise caution before opening attachments, clicking links, or following guidance.
I don't have RTBH, no. It's just a web server.

Now how my hosting provider handled it, I'm not sure. I don't know if they just dropped me internally, or if they used RTBH with their upstreams and peers. Only being 2.5 gigs, that should be well within their ability to handle internally, but I guess why would you if you didn't have to?

-----
Mike Hammett
Intelligent Computing Solutions<http://www.ics-il.com/>
[Image removed by sender.]<https://www.facebook.com/ICSIL>[Image removed by sender.]<https://plus.google.com/+IntelligentComputingSolutionsDeKalb>[Image removed by sender.]<https://www.linkedin.com/company/intelligent-computing-solutions>[Image removed by sender.]<https://twitter.com/ICSIL>
Midwest Internet Exchange<http://www.midwest-ix.com/>
[Image removed by sender.]<https://www.facebook.com/mdwestix>[Image removed by sender.]<https://www.linkedin.com/company/midwest-internet-exchange>[Image removed by sender.]<https://twitter.com/mdwestix>
The Brothers WISP<http://www.thebrotherswisp.com/>
[Image removed by sender.]<https://www.facebook.com/thebrotherswisp>[Image removed by sender.]<https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg>
________________________________
From: "Jean St-Laurent" <jean at ddostest.me>
To: "Mike Hammett" <nanog at ics-il.net>
Cc: "NANOG list" <nanog at nanog.org>
Sent: Monday, February 8, 2021 11:53:43 AM
Subject: RE: Retalitory DDoS
You got RTBH?

From: Mike Hammett <nanog at ics-il.net>
Sent: February 8, 2021 12:50 PM
To: Jean St-Laurent <jean at ddostest.me>
Cc: NANOG list <nanog at nanog.org>
Subject: Re: Retalitory DDoS

In my case, it was against a server not on my own network, so my impact was a blackhole for an hour at 4 AM local time. I likely wouldn't have even noticed it, had I not received the threat email, nor the ticket my web host's NOC opened.

-----
Mike Hammett
Intelligent Computing Solutions<http://www.ics-il.com/>
[Image removed by sender.]<https://www.facebook.com/ICSIL>[Image removed by sender.]<https://plus.google.com/+IntelligentComputingSolutionsDeKalb>[Image removed by sender.]<https://www.linkedin.com/company/intelligent-computing-solutions>[Image removed by sender.]<https://twitter.com/ICSIL>
Midwest Internet Exchange<http://www.midwest-ix.com/>
[Image removed by sender.]<https://www.facebook.com/mdwestix>[Image removed by sender.]<https://www.linkedin.com/company/midwest-internet-exchange>[Image removed by sender.]<https://twitter.com/mdwestix>
The Brothers WISP<http://www.thebrotherswisp.com/>
[Image removed by sender.]<https://www.facebook.com/thebrotherswisp>[Image removed by sender.]<https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg>
________________________________
From: "Jean St-Laurent" <jean at ddostest.me>
To: "Mike Hammett" <nanog at ics-il.net>, "NANOG list" <nanog at nanog.org>
Sent: Monday, February 8, 2021 11:42:12 AM
Subject: RE: Retalitory DDoS
Nice report,

If you would have to pick up just one vector out of this “multi-vector” attack, which one seems to be the one that had the bigger effect on your network or service?

Was it degraded or total service interruption?

Jean

From: NANOG <nanog-bounces+jean=ddostest.me at nanog.org> On Behalf Of Mike Hammett
Sent: February 8, 2021 8:43 AM
To: NANOG list <nanog at nanog.org>
Subject: Re: Retalitory DDoS

Mike,

I've attached the full information we got from our DDOS protection system below.

We had a large number of ping loss and data loss tickets begin opening up for devices sharing the cabinet chi18-313. The high traffic and interference was determined to be caused by incoming traffic to the ip address [Not hard to find, but redacted anyway]. Our network engineers will be back in after 9am until 5pm CST. They have greater access to the network and may be able to give you more details.

Location : Chicago
Event Time : 2021-02-08 04:17:38 CST (-0600)
Destination IP: [Not hard to find, but redacted anyway]
Traffic : 2520 Mbps 382880 pps
Fragmentation : 11%
Top Transport Protocol:
. 99% Protocol # 17 (UDP)
TCP Flag: SYN: 100% ACK: 0% RST: 0% FIN: 0%
Top Source Port:
. 61% Port # 3702
. 38% Port # 0
Top Destination Port:
. 38% Port # 0
. 14% Port # 45934
. 9% Port # 23680
. 8% Port # 35023
. 7% Port # 25966
Top Source IP:
. 0% 112.164.127.17
Number of unique IP: 7110
Total Bytes : 1259961437<callto:1259961437>
Total Packets : 1531559
Duration : 4s
Report Run Time : 151.3ms

The 30 day null route count is: 0
Number of hours to null route : 1

Location : Chicago
Event Time : 2021-02-08 04:02:38 CST (-0600)
Destination IP: [Not hard to find, but redacted anyway]
Traffic : 1817 Mbps 275483 pps
Fragmentation : 13%
Top Transport Protocol:
. 99% Protocol # 17 (UDP)
TCP Flag: SYN: 99% ACK: 0% RST: 0% FIN: 0%
Top Source Port:
. 56% Port # 3702
. 43% Port # 0
Top Destination Port:
. 43% Port # 0
. 19% Port # 25966
. 19% Port # 35023
. 17% Port # 23680
Top Source IP:
. 0% 90.49.167.239
Number of unique IP: 3577
Total Bytes : 953894831
Total Packets : 1157017
Duration : 4.199s
Report Run Time : 306.8ms

The 30 day null route count is: 0
Number of hours to null route : 1

Liam Doring
Systems Administrator

-----
Mike Hammett
Intelligent Computing Solutions<http://www.ics-il.com/>
[Image removed by sender.]<https://www.facebook.com/ICSIL>[Image removed by sender.]<https://plus.google.com/+IntelligentComputingSolutionsDeKalb>[Image removed by sender.]<https://www.linkedin.com/company/intelligent-computing-solutions>[Image removed by sender.]<https://twitter.com/ICSIL>
Midwest Internet Exchange<http://www.midwest-ix.com/>
[Image removed by sender.]<https://www.facebook.com/mdwestix>[Image removed by sender.]<https://www.linkedin.com/company/midwest-internet-exchange>[Image removed by sender.]<https://twitter.com/mdwestix>
The Brothers WISP<http://www.thebrotherswisp.com/>
[Image removed by sender.]<https://www.facebook.com/thebrotherswisp>[Image removed by sender.]<https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg>
________________________________
From: "Mike Hammett" <nanog at ics-il.net>
To: "NANOG list" <nanog at nanog.org>
Sent: Monday, February 8, 2021 5:46:26 AM
Subject: Retalitory DDoS
Is there a club for people that have been DDoSed? If so, count me in.

This one was directed at me (as opposed to one of my customers) because I got an e-mail explaining why I was getting DDoSed. Is that aspect common?

There were also some racial and sexual accusations that were made that clearly aren't true and just speak to the intelligence of people like this.

Is it safe to assume that they completely anonymized the email they sent to me?

Is there anyone I should be reporting this to?

I thought my site was running in Cloudflare, but my individual server was still attacked, so I gotta figure out where I screwed that up.

https://www.dropbox.com/s/rrrx90jvy09h26s/ICS%20DDoS.png?dl=0

-----
Mike Hammett
Intelligent Computing Solutions<http://www.ics-il.com/>
[Image removed by sender.]<https://www.facebook.com/ICSIL>[Image removed by sender.]<https://plus.google.com/+IntelligentComputingSolutionsDeKalb>[Image removed by sender.]<https://www.linkedin.com/company/intelligent-computing-solutions>[Image removed by sender.]<https://twitter.com/ICSIL>
Midwest Internet Exchange<http://www.midwest-ix.com/>
[Image removed by sender.]<https://www.facebook.com/mdwestix>[Image removed by sender.]<https://www.linkedin.com/company/midwest-internet-exchange>[Image removed by sender.]<https://twitter.com/mdwestix>
The Brothers WISP<http://www.thebrotherswisp.com/>
[Image removed by sender.]<https://www.facebook.com/thebrotherswisp>[Image removed by sender.]<https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg>

E-MAIL CONFIDENTIALITY NOTICE: 
The contents of this e-mail message and any attachments are intended solely for the addressee(s) and may contain confidential and/or legally privileged information. If you are not the intended recipient of this message or if this message has been addressed to you in error, please immediately alert the sender by reply e-mail and then delete this message and any attachments. If you are not the intended recipient, you are notified that any use, dissemination, distribution, copying, or storage of this message or any attachment is strictly prohibited.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.nanog.org/pipermail/nanog/attachments/20210208/d2022941/attachment-0001.html>