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Typosquatting: Awareness and Hunting, (Sat, May 20th)

Typosquatting has been used for years to lure victims You receive an email or visit an URL with a domain name which looks like the official one. Typosquatting is the art of swapping, replacing, adding or omitting some letters to make a domain looking like the official one. The problem is that the human brain will correct automatically what you see and you think that you visit the right site. I remember that the oldest example of typosquatting that I saw was mircosoft.com. Be honest, at the first time, you read microsoft.com right? This domain was registered in 1997 butit has been taken back by Microsoft for a while. Longer is your domain name, more you have available combinations of letters to generate fake domains. Sometimes its difficult to detect rogue domains due to the font used to display them. Anl looks like a 1 or a 0 looks like an O.

Yesterday, I found a nice phishing email related to DHL (the worldwide courier company). The message was classic: DHL claims that somebody passed by your home and nobody was present. But this time, it was not a simple phishing page trying to collect credentials, there was a link to a ZIP file. The archive contained a malicious HTA file that downloaded a PE file[1] and executed it. Lets put the malware aside and focus on the domain name that was used: dhll.com(with a double L).

A quick check reveals that this domain is hopefully owned by DHL (not DHL Express but the Deutsche Post DHL padding:5px 10px”>
Domain Name: dhll.com
Registry Domain ID: 123181256_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.markmonitor.com
Registrar URL: http://www.markmonitor.com
Updated Date: 2016-09-23T04:00:10-0700
Creation Date: 2004-06-22T00:00:00-0700
Registrar Registration Expiration Date: 2017-06-22T00:00:00-0700
Registrar: MarkMonitor, Inc.
Registrar IANA ID: 292
Registrar Abuse Contact Email: abusecomplaints@markmonitor.com
Registrar Abuse Contact Phone: +1.2083895740
Domain Status: clientUpdateProhibited (https://www.icann.org/epp#clientUpdateProhibited)
Domain Status: clientTransferProhibited (https://www.icann.org/epp#clientTransferProhibited)
Domain Status: clientDeleteProhibited (https://www.icann.org/epp#clientDeleteProhibited)
Registry Registrant ID:
Registrant Name: Deutsche Post AG
Registrant Organization: Deutsche Post AG
Registrant Street: Charles-de-Gaulle-Strasse 20
Registrant City: Bonn
Registrant State/Province: –
Registrant Postal Code: 53113
Registrant Country: DE
Registrant Phone: +49.22818296701
Registrant Phone Ext:
Registrant Fax: +49.22818296798
Registrant Fax Ext:
Registrant Email: domains@deutschepost.de
Registry Admin ID:Admin Name: Domain Administrator
Admin Organization: Deutsche Post AG
Admin Street: Charles-de-Gaulle-Strasse 20
Admin City: Bon
Admin State/Province: –
Admin Postal Code: 53113
Admin Country: DE
Admin Phone: +49.22818296701Admin Phone Ext:
Admin Fax: +49.22818296798
Admin Fax Ext:
Admin Email: admincontact.domain@deutschepost.de
Registry Tech ID:
Tech Name: Technical Administrator
Tech Organization: DHL
Tech Street: 8701 East Hartford Drive
Tech City: Scottsdale
Tech State/Province: AZ
Tech Postal Code: 85255
Tech Country: US
Tech Phone: +1.4089616666
Tech Phone Ext:
Tech Fax: –
Tech Fax Ext:
Tech Email: netmaster@dhl.com
Name Server: ns4.dhl.com
Name Server: ns6.dhl.com
DNSSEC: unsigned

The zone dhll.com is also hosted on the DHL name servers. Thats a good point that DHL registered potentially malicious domains but… if you do this, dont only park the domain, go further and really use it! Its not because the domain has been registered by the official company that bad guys cannot abuse it to send spoofed emails.

First point: dhll.com or www.dhll.com donot resolve to an IP address. If you register such domains, create a website and make them pointto it and log whos visiting the fake page. You can display an awareness message or just redirect to the official site. This will also prevent your customers to land on a potentially malicious site and improve their experience with you.

The second point is related to the MX records. No MX records were defined for the dhll.com domain. Like with the web traffic, build a spam trap to collect all messages that are sent to *@dhll.com.By doing this, you will capturetraffic potentially interesting and you will be able to detect if the domain is used in a campaign (ex: you will catchall the non-delivery receipts in the spam trap.

Finally, addan SPF[2] record for the domain. This will reduce the amount of spam and phishing campaigns.

To conclude, registering domain names derived from your companys name is the first step but dont just park them and use them for hunting and awareness!

A quick reminder about the tool dnstwist[3] which is helpful padding:5px 10px”>
# docker run -it –rm jrottenberg/dnstwist –ssdeep –mxcheck –geoip dhl.com
_ _ _ _
__| |_ __ ___| |___ _(_)___| |_
/ _` | _ / __| __ / / / / __| __|
| (_| | | | __ |_ V V /| __ |_
__,_|_| |_|___/__| _/_/ |_|___/__| {1.01}

Fetching content from: http://dhl.com … 200 OK (396.3 Kbytes)
Processing 56 domain variants ……………. 48 hits (85%)

Original* dhl.com 199.40.253.33/United States NS:ns4.dhl.com MX:mx1.dhl.iphmx.com SSDEEP:100%
Bitsquatting ehl.com 45.33.14.247 NS:pdns03.domaincontrol.com MX:smtp.secureserver.net
Bitsquatting fhl.com –
Bitsquatting lhl.com –
Bitsquatting thl.com 50.57.5.162/United States NS:dns1.name-services.com MX:us-smtp-inbound-1.mimecast.com
Bitsquatting dil.com 72.52.4.119/United States NS:ns1.sedoparking.com MX:localhost
Bitsquatting djl.com 117.18.11.145/Hong Kong NS:ns1.monikerdns.net
Bitsquatting dll.com 68.178.254.85/United States NS:ns43.domaincontrol.com MX:smtp.secureserver.net
Bitsquatting dxl.com 69.74.234.98/United States NS:ns59.worldnic.com SPYING-MX:dxl-com.mail.protection.outlook.com
Bitsquatting dhm.com 192.241.215.84/United States NS:ns19.worldnic.com MX:dhm.com
Bitsquatting dhn.com 62.129.139.241/Netherlands NS:pdns07.domaincontrol.com MX:smtp.secureserver.net
Bitsquatting dhh.com 103.241.230.134/India NS:dns1.iidns.com
Bitsquatting dhd.com NS:ns-west.cerf.net MX:dhd-com.mail.protection.outlook.com
Homoglyph bhl.com 206.188.192.219/United States NS:ns79.worldnic.com SPYING-MX:bhl-com.mail.protection.outlook.com
Homoglyph dhi.com 199.36.188.56/United States NS:ns10.dnsmadeeasy.com
Homoglyph clhl.com 209.61.212.154/United States NS:ns1.dnsnameservice.com MX:smtp.getontheweb.com
Homoglyph dlhl.com 209.61.212.154/United States NS:ns1.dnsnameservice.com MX:smtp.getontheweb.com
Homoglyph dihl.com 209.61.212.154/United States NS:ns1.dnsnameservice.com MX:smtp.getontheweb.com
Homoglyph dh1.com 208.91.197.27/Virgin Islands NS:ns43.worldnic.com SPYING-MX:p.webcom.ctmail.com
Hyphenation d-hl.com 104.24.124.134/United States 2400:cb00:2048:1::6818:7c86 NS:fiona.ns.cloudflare.com MX:mx1.emailowl.com
Hyphenation dh-l.com 72.52.4.119/United States NS:ns1.sedoparking.com MX:localhost
Insertion duhl.com 209.61.212.154/United States NS:ns1.dnsnameservice.com MX:smtp.getontheweb.com
Insertion dhul.com 82.194.88.4/Spain NS:ns1.dominioabsoluto.com
Insertion djhl.com 47.89.24.50/Canada NS:f1g1ns1.dnspod.net
Insertion dhjl.com –
Insertion dnhl.com 209.61.212.154/United States NS:ns1.dnsnameservice.com MX:smtp.getontheweb.com
Insertion dhnl.com 209.61.212.154/United States NS:ns1.dnsnameservice.com MX:smtp.getontheweb.com
Insertion dbhl.com 209.61.212.154/United States NS:ns1.dnsnameservice.com MX:smtp.getontheweb.com
Insertion dhbl.com 209.61.212.154/United States NS:ns1.dnsnameservice.com MX:smtp.getontheweb.com
Insertion dghl.com 209.61.212.154/United States NS:ns1.dnsnameservice.com MX:smtp.getontheweb.com
Insertion dhgl.com 209.61.212.161/United States NS:ns1.dnsnameservice.com MX:smtp.getontheweb.com
Insertion dyhl.com NS:dns17.hichina.com MX:mxbiz1.qq.com
Insertion dhyl.com –
Omission dl.com 104.247.212.218 NS:ns1.gridhost.com SPYING-MX:mail.b-io.co
Omission dh.com 54.204.28.210/United States NS:a5-67.akam.net SPYING-MX:mx1.dhltd.iphmx.com
Omission hl.com 107.154.105.117/United States NS:ns57.domaincontrol.com MX:mail0.hl.com
Repetition ddhl.com 180.149.253.156/Hong Kong NS:ns11.domaincontrol.com SPYING-MX:ddhl-com.mail.protection.outlook.com
Repetition dhll.com –
Repetition dhhl.com 209.61.212.154/United States NS:ns1.dnsnameservice.com MX:smtp.getontheweb.com
Replacement rhl.com 107.161.31.165/United States NS:ns1.hungerhost.com MX:mx.spamexperts.com
Replacement chl.com 216.222.148.100 NS:nameserver.ttec.com MX:smtp2.mx.ttec.com
Replacement xhl.com 69.172.201.153/United States NS:ns1.uniregistrymarket.link
Replacement shl.com 69.171.27.23/United States NS:eu-sdns-01.shl.com SPYING-MX:mxa-0016ba01.gslb.pphosted.com
Replacement dul.com 62.129.139.241/Netherlands NS:pdns01.domaincontrol.com MX:smtp.secureserver.net
Replacement dnl.com –
Replacement dbl.com 198.173.111.6/United States NS:ns53.worldnic.com SPYING-MX:p.webcom.ctmail.com
Replacement dgl.com 216.107.145.5 NS:ns62.downtownhost.com MX:dgl.com
Replacement dyl.com 99.198.109.164/United States NS:ns-1768.awsdns-29.co.uk MX:mail.dyl.com
Replacement dhk.com 98.191.212.87/United States NS:ns1.dhk.com MX:dhk.com.us.emailservice.io
Replacement dho.com 75.126.101.248/United States NS:ns1bqx.name.com
Replacement dhp.com 199.4.150.5/United States NS:dhp.com MX:mailhub.dhp.com
Subdomain d.hl.com –
Subdomain dh.l.com –
Transposition hdl.com 216.51.232.170/United States NS:ns1.systemdns.com MX:aspmx.l.google.com
Transposition dlh.com 212.130.57.148/Denmark NS:ns1.ascio.net SPYING-MX:mail.dlh.com
Various wwwdhl.com 199.41.238.47/United States NS:ns.deutschepost.de

[1]https://www.virustotal.com/en/file/f438ba968d6f086183f3ca86c3c1330b4c933d97134cb53996eb41e4eceecf53/analysis/
[2]https://support.google.com/a/answer/33786?hl=en
[3]https://github.com/elceef/dnstwist

Xavier Mertens (@xme)
ISC Handler – Freelance Security Consultant
PGP Key

(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.

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