Performing Regex Searches Against DNSDB MTBL Files

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1. Introduction

When searching DNSDB using the DNSDB API or DNSDB web interface, DNSDB allows you to search for domain names three different ways:

  • Exact matches (www.example.com),
  • Simple left-hand-side wildcard matches (*.example.com), or
  • Simple right-hand-side wildcard matches (www.example.*).

There are some other search queries that will NOT currently work. For example:

  • You CAN’T search for a pattern that needs to have a wildcard on both the left- and the right-hand sides simultaneously (\*foobar\*),
  • You also CAN’T search for midstring wildcards (foo\*bar),
  • Nor can you successfully do “partial-label” [1] searches (for example, searching for www.stsa\* will not match www.stsauver.com in DNSDB)

In some circumstances, such as when you’re searching for potentially infringing domain names, this can be potentially frustrating. What you’d really like is the ability to do arbitrary regular expression (regex) searches, just as you could with the Unix grep command.

Regrettably, you CAN’T currently do most grep-like searches if you’re using DNSDB API or the DNSDB web interface.

2. Well, What About Doing Regex Searches If I’m Using DNSDB EXPORT?

DNSDB Export normally works just like DNSDB API, except that a copy of the DNSDB database is run locally on the customer’s premises. Because DNSDB is running on a local customer server:

  • Query latency can be dramatically reduced,
  • The local site can have total control over server provisioning and operations,
  • DNSDB can be used in totally offline environments, and
  • Because queries and responses never leave the customer’s premises, query privacy is assured.
  • Particularly relevant to today’s post, having a local copy of DNSDB’s MTBL database files expands the range of queries you can perform.

If you’re a DNSDB Export customer and would like to be able to run an expanded range of queries directly against the DNSDB MTBL files you’ve downloaded, contact your Farsight account executive to discuss an amendment to your DNS Export contract that will protect your rights and ours. For the remainder of this article, we’ll assume you’ve already done so.

Let’s look at a practical example of what this new capability can mean.

Citigroup is the fourth-largest bank in the United States. As such, it’s unsurprising that Citibank and its customers are often targeted for phishing attacks.

Many phishing attacks rely on domain names that embed a target’s brand in an effort to gain credibility while intentionally misleading users, thereby setting them up so they’re willing to disclose their username and password. Because this type of attack is so common, most cyber security teams pay close attention to new domain names that use their company’s service marks without authorization.

But how to find those potential infringing domains? DNSDB Export makes it easy.

For the purposes of this example, we’ll check one day’s MTBL files for any domains that contain the literal string “citibank”.

Naturally, there will likely be some legitimate citibank-related domains that include that literal, but we’re not concerned about those. What we’re concerned about is any “citibank” domains that are NOT under the control of Citibank.

Let’s check and see if we can find those in DNSDB MTBL files.

The first thing you need is access to the MTBL files. If you’ve licensed DNSDB Export, the MTBL files may be located right on the server you’re using, or, perhaps those files may be NFS mounted over the network, as ours are.

The MTBL file naming scheme is pretty self-descriptive for the most part:

- dns.* NON-DNSSEC records only
- dnssec.* DNSSEC records only

- YYYYMMDD[.HHMM] this is the date/UTC time that the data collection began

- m: this is a minutely file
- X: this is a decaminutely ("every ten minutes") file
- H: this is an hourly file
- D: this is a daily file
- M: this is a monthly file
- Y: this is a yearly file

For example, the MTBL daily files for February 5th, 2017 have names that look like:

$ cd /export/dnstable/mtbl
$ ls -l dns*.20170205.D.mtbl 
-rw-r--r-- 1 root root 22,066,723,025 Feb  6 02:39 dns.20170205.D.mtbl
-rw-r--r-- 1 root root  5,169,352,578 Feb  6 00:13 dnssec.20170205.D.mtbl
[commas added for readability]

For the purposes of this article, we’re going to focus on just the roughly 22 gigabyte dns.20170205.D.mtbl file, and ignore the DNSSEC resource records from that same date.

dns.20170205.D.mtbl is stored in MTBL binary format so we’ll need to begin by decoding it into a more readily accessible format. We’ll do that with the dnstable_dump command (which will normally be installed as part of your DNSDB Export installation, however you can also review that code here).

We can then pipe the output from dnstable_dump through grep.

To get a sense of how long it will take to dump that MTBL file and grep it, we’ve bracketed those commands with Unix “date” commands to show the starting and stopping timestamps:

$ date; dnstable_dump --rrset_names --json dns.20170205.D.mtbl | grep citibank > ~/citibank.txt ; date 
Mon Feb  6 22:04:26 UTC 2017
Mon Feb  6 22:07:45 UTC 2017

As you can see from the reported timestamps, that process took only a few minutes, even when dumping and brute force grep’ing 22 gigabytes of data from an NFS-mounted disk on a relatively-low-powered blade server.

Going to the directory where the output from that search was written, we can see that our search found 1290 “hits” that contained the literal string “citibank”:

$ wc -l citibank.txt
1290 citibank.txt

The first 20 lines of that output file looks like:

$ head -20 citibank.txt
{"rrset_name":"a.mx.emailmessage2.citibank.com."}
{"rrset_name":"a.mx.serviceemail2.citibank.com."}
{"rrset_name":"a.ns.email.citibank.co.uk."}
{"rrset_name":"a.ns.emailmessage2.citibank.com."}
{"rrset_name":"a.ns.serviceemail2.citibank.com."}
{"rrset_name":"b.mx.serviceemail2.citibank.com."}
{"rrset_name":"b.ns.email.citibank.co.uk."}
{"rrset_name":"b.ns.emailmessage2.citibank.com."}
{"rrset_name":"b.ns.serviceemail2.citibank.com."}
{"rrset_name":"c.ns.email.citibank.co.uk."}
{"rrset_name":"c.ns.emailmessage2.citibank.com."}
{"rrset_name":"c.ns.serviceemail2.citibank.com."}
{"rrset_name":"d.ns.email.citibank.co.uk."}
{"rrset_name":"d.ns.emailmessage2.citibank.com."}
{"rrset_name":"d.ns.serviceemail2.citibank.com."}
{"rrset_name":"e.ns.email.citibank.co.uk."}
{"rrset_name":"e.ns.emailmessage2.citibank.com."}
{"rrset_name":"e.ns.serviceemail2.citibank.com."}
{"rrset_name":"f.ns.email.citibank.co.uk."}
{"rrset_name":"f.ns.emailmessage2.citibank.com."}
[etc]

You’ll notice that those records are in “JSON Lines” (newline-delimited JSON) format. We can further process those records with jq so that we’re left with just the domain names themselves; we’ll then use the reverse-domain-names script [2] and the Unix sort command to prepare those domains for analyst review:

$ jq -r .rrset_name < citibank.txt | reverse-domain-names | sort -u > citibank2.txt

The 1290 matching domains (in reversed format) can be seen in Appendix I.

PLEASE NOTE: we strongly recommend AGAINST casually visiting any potentially-infringing domain since, while some are legitimate, other domains may attempt to drop malware on anyone who visits them. Let’s be careful out there!

4. Sorting the “Sheep” From the “Goats” With Domain Whois

Normally, a brand owner will have a list of the domain names that are part of their domain name portfolio. Comparing that list against the list you’ve found in DNSDB can easily be done with grep -v or with brief Perl code such as the “weedout” script below [3].

However, in our case, we don’t have access to Citibank’s own list of domains, so we’ll need to improvise a little.

There are many approaches you could try, but just to show one approach, let’s try DomainTool’s nifty Bulk Parsed Whois tool, a very popular for-fee Whois service.

We’ll prepare our list of effective-2nd-level domains [4] that need checking by saying:

$ jq -r .rrset_name < citibank.txt | 2nd-level-dom | sort -u > citibank3.txt
$ wc -l citibank3.txt 
716 citibank3.txt

716 effective-2nd-level domains to check is a perfect number of domains to work with given that the DomainTools Bulk Parsed Whois tool can work with up to 2,000 entries per submission.

To check the 716 domains we found with DNSDB Export, we copy and paste that list of domains into the DomainTools web form. See Figure 1.

Figure 1.

After we copy and paste in our domains and submit that form, DomainTools will return a CSV file with our results.

Opening that file with Microsoft Excel, sorting by column D (the administrative contact organization), and shrinking columns B and C which we don’t particularly need right now, we can see some of the domains that are listed as having a CitiBank N.A. administative contact. See the excerpt from the CSV file in Figure 2.

Figure 2.

This simple step allows us to stop worrying about at least 320 of the 716 effective 2nd-level domains we’ve found. Many others may be able to be eliminated by simple inspection. For example, citibankaaadvantagemiles.com appears to be a co-branded payment card offered in conjunction with American Airlines, Inc. That’s hardly a domain that should make a fraud analyst’s eyebrow go up.

Having eliminated the domains that belong directly to Citibank, and the domains that are in use by legitimate partners (such as American Airlines), the security analyst can then do a deep dive on the remaining effective-2nd-level domains that may still be of unknown provenance.

5. Real-Time Brand Protection

If you’re interested in brand protection, but you need something automated that works in real-time, Farsight also has this use case covered. By leveraging our Brand Sentry product, an organization can monitor in real-time its brands for unauthorized or uncharacteristic usage. To learn more about Brand Sentry, please contact Farsight Security, Inc., sales at https://www.farsightsecurity.com/order-services/.

6. Conclusion

We’ve seen how searching for a simple midstring wildcard (like “citibank”) in MTBL files can open up productive new areas for brand protection investigators. However, in looking at that example, we’ve barely scratched the surface. Imagine searching DNSDB for any sort of regular expression you could write in grep!

What arbitrary matching expressions will you try against your on-premises DNSDB Export database?

If you need information about how to license DNSDB Export for your company, please contact Farsight Security, Inc., sales at https://www.farsightsecurity.com/order-services/.

Notes:

[1] A label can be thought of as a “chunk” of a domain name as delimited by dots. For instance, www.example.com has three labels: www, example, and com.

[2] reverse-domain-names is just a simple perl script:

#!/usr/bin/perl
my @lines = <>;
chomp @lines;
@lines =
    map { join ".", reverse split /\./ }
    sort
    @lines;
print "$_\n" for @lines;

[3] The little Perl weedout script is pretty simple, too:

#!/usr/bin/perl
while (<>) {
        $weed{$_}=1;
}
while (<>) {
        print unless $weed{$_};
}

[4] For background on effective 2nd-level-domains, please check out The Public Suffix List.

If you want a copy of the 2nd-level-dom script, it looks like:

#!/usr/bin/perl
use strict;
use warnings;
use IO::Socket::SSL::PublicSuffix;

my $pslfile = '/your\_path\_here/public\_suffix\_list.dat';
my $ps = IO::Socket::SSL::PublicSuffix->from\_file($pslfile);

my $line;

foreach $line (<>) {
        chomp($line);
        my $root_domain = $ps->public_suffix($line,1);
        printf( "%s\n", $root_domain );
}

Appendix I. “citibank” domains (in reversed format)

NOTE: Potentially Malicious Domains! While some of these domains are legitimate domains, others may attempt to phish you or drop malware on you if you visit them. Because of this risk, please do NOT visit any listed domain unless you know those domains are safe, or you’re a trained professional cyber security analyst and you’ve taken appropriate precautions.

adult.citibank
ae.citibank
ae.citibank.alertingservicesuat
ae.citibank.clay
ae.citibank.mart
ae.citibank.mobile
ae.citibank.online
ae.citibank.tram
ae.citibank.www
ar.com.citibank
ar.com.citibank.empresas
ar.com.citibank.www
asia.citibank
au.com.citibank
au.com.citibank.bulb
au.com.citibank.chat
au.com.citibankdining
au.com.citibankdining.www
au.com.citibank.email
au.com.citibank.email.image
au.com.citibank.lendersystemuat
au.com.citibank.mobile
au.com.citibank.mortgagebroker.uat
au.com.citibank.pat.mobile
au.com.citibank.plant
au.com.citibank.strings
au.com.citibank.www
au.com.citibank.www2
au.com.citigroup.wlb.au.citibank
au.com.thepositivityproject.dhqapdeqiz.com.citibank.online
au.com.thepositivityproject.ot8sbd1gw2.com.citibank.online
be.citibank
be.citibank.citibankonline
be.citibank.www
bet.citibank
bg.citibank
bh.com.citibank
bh.com.citibank.alternate
bh.com.citibank.chat
bh.com.citibank.production
bh.com.citibank.production.www
bh.com.citibank.www
bid.citibankcard
biz.citibanking
biz.citibankonline
biz.citibanksa
biz.citibankwings
black.citibank
blog.citibank
blue.citibank
br.b.citibank
br.b.citibank.www
br.com.bancocitibank
br.com.citibank
br.com.citibank.ajuda
br.com.citibankblack
br.com.citibankblackcard
br.com.citibankcards
br.com.citibank.cardsonline
br.com.citibank.cardsonline.www
br.com.citibank.chat
br.com.citibankcuentatransfer
br.com.citibankhall
br.com.citibank.privilegio
br.com.citibankseguros
br.com.citibanktitaniumcard
br.com.citibanktransfer
br.com.citibank.troco
br.com.citibank.www
br.com.cuentatransfercitibank
br.com.hktreina.qmtfm.com.citibank.online
br.com.prestum.citibank
br.net.ahera.citibank.www
broker.citibank
buzz.citibank
ca.citibank
ca.citibank.www
cat.citibank
center.citibank
ceo.citibank
ch.citibank
click.citibank
cloud.citibank
cloud.citibanks
cl.sindicatocitibank
cl.sindicatocitibank.www
club.citibank
cm.citibank
cn.citibank
cn.citibank.www
cn.com.citibank
cn.com.citibank.chair
cn.com.citibank.grand
cn.com.citibank.mobile
cn.com.citibank.slice
cn.com.citibank.uat1.globalcommonbuild
cn.com.citibank.uat2.globalcommon.cnmobile
cn.com.citibank.www
cn.zj.citibank
co.citibank
co.com.citibank
co.com.citibank.fila
co.com.citibank.m
co.com.citibank.puente
co.com.citibank.solapa
co.com.citibank.www
com.2dayshippingbycitibank
com.aacitibank
com.accountupdate-citibank
com.acitibank
com.advancecashvacation.card.travel.government.citibank.www
com.agari.rua._dmarc._report.com.citibank
com.anticitibank
com.apaccitibank
com.appstudios.tmhwm8ocht.com.citibank.online
com.argentinacitibank
com.bancocitibank
com.banklocationmaps.citibank
com.betomultimarcas.my.com.citibank.www
com.brasil-citibankbr
com.career.citibank
com.cariyuk.ayamtulanglunakhayamwuruk.www.atmcitibank.furnitureworkshopwangi
com.cariyuk.cake.sugarandegg.atmcitibank.ristra
com.cariyuk.com.cetakdong.jerseybola.citibank
com.cariyuk.hongtang.www.atmcitibank.ristra
com.cariyuk.hongtang.www.citibank.ambienteitalianrestaurant
com.cariyuk.hongtang.www.citibank.americangrill
com.cariyuk.hongtang.www.citibank.brigitafastfood
com.cariyuk.hongtang.www.citibank.nyx
com.cariyuk.hongtang.www.wacoal.atmcitibank
com.cariyuk.yoshinoya.pokesushi.atmcitibank.daisho
com.cariyuk.yoshinoya.pokesushi.atmcitibank.gaudi
com.cariyuk.yoshinoya.pokesushi.atmcitibank.osella
com.cashedge.ft.citibankui
com.ccitibank
com.citibank
com.citibank1
com.citibank666
com.citibankaa
com.citibankaaadvantagemiles
com.citibankaadvantage
com.citibankaa.ww2
com.citibankaccount
com.citibankaccountonline
com.citibank.accountonline
com.citibank.accountonline.www
com.citibankadvantage
com.citibankaffiliate
com.citibankalbania
com.citibankalum
com.citibankaol
com.citibank.apac.chat
com.citibank.apac.secureauthentication
com.citibank.apac.verifysecureenrollment
com.citibank.ap.connecttr1
com.citibankarena
com.citibankargentina
com.citibank.argentina.campo
com.citibank.argentina.chat
com.citibank.argentina.red
com.citibank.argentina.stocks
com.citibank.argentina.tarjeta
com.citibank.argentina.www
com.citibank.asia.www
com.citibankatwork
com.citibankatwork.www
com.citibankauto
com.citibankautofinance
com.citibankautofinanee
com.citibankautoloan
com.citibankautoloans
com.citibankauto.ww12
com.citibankbahrain
com.citibankbanamex
com.citibankbanamexusa
com.citibank-banamexusa
com.citibankbanamexusa.www
com.citibankbangladesh
com.citibankbank
com.citibank.banking
com.citibankbanksters
com.citibankbank.ww1
com.citibankbelgium
com.citibankberhad
com.citibankbillmanager
com.citibankbitcoin
com.citibankblack
com.citibankblackcard
com.citibank.brasil.www
com.citibankbrazil
com.citibank.brazil.corporate
com.citibank-brgcb
com.citibankbroker
com.citibankbrokerage
com.citibankbulgaria
com.citibankbusiness
com.citibank.businessaccess
com.citibankbusinesscard
com.citibankbusinessonline
com.citibankbusinessonline.www
com.citibankc
com.citibank.calculators
com.citibank.campus.www
com.citibankcanada
com.citibankcard
com.citibank-card
com.citibankcards
com.citibankcardservices
com.citibankcards.info
com.citibankcards.mail
com.citibankcards.www
com.citibankcard.www
com.citibankcareer
com.citibankcareers
com.citibank.careers
com.citibank.careers.www
com.citibankcashreturn
com.citibankcashreturncard
com.citibankcashreturns
com.citibankcashreturnscard
com.citibankcd
com.citibankcds
com.citibank.ceemea.www
com.citibankcentertickets
com.citibankcerditcard
com.citibankchecking
com.citibankcheckingaccount
com.citibankchecks
com.citibankchile
com.citibankchina
com.citibank.citiconnecteu
com.citibank.citidirectonline.www
com.citibank.citigold.argentina.www
com.citibank.citirewards
com.citibankclassaction
com.citibankcloud
com.citibank.cobrosonline.www
com.citibankcolombia
com.citibank.columbia.www
com.citibankcom
com.citibank-com
com.citibankcom.ww25
com.citibankcrdeitcard
com.citibankcredicard
com.citibank-credicard
com.citibankcredit
com.citibankcreditcard
com.citibankcreditcardmastertrust
com.citibankcreditcardonline
com.citibankcreditcards
com.citibankcreditcards.www
com.citibankcreditmonitoring
com.citibankcreditmonitoringservice
com.citibankcreditmonitoring.ww4
com.citibankcreditreport
com.citibankcredits
com.citibankcreitcard
com.citibankcuentatransfer
com.citibankcustomer
com.citibankcustomerservice
com.citibankd
com.citibank.daqa-us.olb-armtu1web1
com.citibank.daqa-us.olb-armtu1web1-cg
com.citibank.da-us.citibusinessonline
com.citibank.da-us.olb-usmtprweb3
com.citibank.da-us.web
com.citibank.da-us.web-ao
com.citibankdebt
com.citibankdenmark
com.citibank.dev2.citiwallet
com.citibank.dev.citiwallet
com.citibankdiamond
com.citibankdining
com.citibank.dir
com.citibankdirect
com.citibank.direct
com.citibankdirectaccess
com.citibankdiversity
com.citibankdividend
com.citibank._dmarc
com.citibank._domainkey._adsp
com.citibank._domainkey.maila
com.citibankdubai
com.citibankeasydeals
com.citibankeasydeals.ww25
com.citibankebilling
com.citibank-ebilling
com.citibank-e-business
com.citibankegypt
com.citibankegypt.production
com.citibankegypt.www
com.citibank.emailmessage2
com.citibank.emailmessage2.l
com.citibank.emailmessage2.mx.a
com.citibank.emailmessage2.ns.a
com.citibank.emailmessage2.ns.b
com.citibank.emailmessage2.ns.c
com.citibank.emailmessage2.ns.d
com.citibank.emailmessage2.ns.e
com.citibank.emailmessage2.ns.f
com.citibank.emailmessage2.x
com.citibankemployment
com.citibank-entertainer
com.citibankequity
com.citibankesavings
com.citibank-escucha
com.citibankespanol
com.citibank.feedback
com.citibankfinance
com.citibankfinancial
com.citibankfinancialservices
com.citibankfinland
com.citibankforeigncurrency
com.citibankforeignexchange
com.citibankfrance
com.citibankfreeshipping
com.citibankfsb
com.citibankfundtransfer
com.citibankfx
com.citibankfxlink
com.citibankgermany
com.citibank.globalcommonbuild.thgcb.uat1
com.citibankgold
com.citibankgoldcard
com.citibankgold.ww12
com.citibankgreece
com.citibankgroup
com.citibankgroups
com.citibankgroupsplc
com.citibankgroups.www
com.citibankguam
com.citibankguide
com.citibankhandlowy
com.citibankhelp
com.citibankhilton
com.citibankhiltoncard
com.citibankhiltonhhonors
com.citibankhiltonhonors
com.citibankhomeequity
com.citibankhomeequityloan
com.citibankhongkong
com.citibankhotel
com.citibank.hsa.secure
com.citibankhungary
com.citibanki
com.citibank-icard
com.citibankindia
com.citibank.india.remoteaccesstest.marketuat
com.citibank.india.remoteaccesstest.www
com.citibankindia.www
com.citibankindonesia
com.citibank.info
com.citibank.info3
com.citibank.info3._domainkey.default
com.citibank.info9
com.citibank.info9.click
com.citibank.info9.image
com.citibank.info9.view
com.citibank.info._dmarc
com.citibank.info._domainkey.ei
com.citibank.info.mail2
com.citibanking
com.citibankingcareers
com.citibankingonline
com.citibankinsurance
com.citibankinterestrates
com.citibank.interinstitutiontransfers
com.citibankinternational
com.citibankinternetbanking
com.citibankintl
com.citibankinvestments
com.citibankiran
com.citibankiraq
com.citibankireland
com.citibankitaly
com.citibanki.www
com.citibankj
com.citibankjamaica
com.citibankjapan
com.citibankjobs
com.citibankjobs.ww38
com.citibankjordan
com.citibankk
com.citibankkenya
com.citibankkonline
com.citibankkorea
com.citibankkuwait
com.citibankl
com.citibank.latam.www
com.citibank.latinamerica.www
com.citibanklending
com.citibank-listens-my
com.citibankloan
com.citibankloanhelp
com.citibankloans
com.citibanklocation
com.citibank.locations
com.citibanklocation.www
com.citibanklogin
com.citibanklogin.ww2
com.citibanklogin.www
com.citibanklondon
com.citibank-london
com.citibankmagazines
com.citibank-maghreb
com.citibankmalaysia
com.citibankmaldives
com.citibankmastercard
com.citibank-mead-alumni
com.citibankmerchantservices
com.citibank.metrics
com.citibank.metrics1
com.citibankmobile
com.citibank.mobile.sit04
com.citibank.mobile.sit10
com.citibank.mobile.uat01
com.citibank.mobile.uat04
com.citibank.mobile.uat05
com.citibank.mobile.uat09
com.citibankmongolia
com.citibankmonitoring
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– Joe St Sauver, Ph.D. is a Scientist with Farsight Security, Inc.

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