Threat Intelligence

Taking Back the DNS

Most new domain names are malicious. I am stunned by the simplicity and truth of that observation. Every day lots of new names are added to the global DNS, and most of them belong to scammers, spammers, e-criminals, and speculators. The DNS industry has a lot of highly capable and competitive registrars and registries who have made it possible to reserve or create a new name in just seconds, and to create millions of them per day. Domains are cheap, domains are plentiful, and as a result most of them are dreck or worse. more

Port 25 Blocking, or Fix SMTP and Leave Port 25 Alone for the Sake of Spam?

Larry Seltzer wrote an interesting article for eWeek, on port 25 blocking, the reasons why it was being advocated, and how it would stop spam. This quoted an excellent paper by Joe St.Sauver, that raised several technically valid and true corollaries that have to be kept in mind when blocking port 25 -- "cough syrup for lung cancer" would be a key phrase... Now, George Ou has just posted an article on ZDNET that disagrees with Larry's article, makes several points that are commonly cited when criticizing port 25 blocking, but then puts forward the astonishing, and completely wrong, suggestion, that worldwide SPF records are going to be a cure all for this problem. Here is my reply to him... more

DNS Changer

One fine night in November 2011 I got an opportunity to get my hands dirty, working on a project for the United States Federal Bureau of Investigation (FBI). They were planning to seize a bunch of computing assets in New York City that were being used as part of a criminal empire that we called "DNS Changer" since that was the name of the software this gang used to infect a half million or so computers. more

Sender Address Verification: Solving the Spam Crisis

There are many companies in the spam-fighting business and most, if not all, claim to be hugely successful. Yet spam is exponentially more prevalent today than it was just 2 years ago. How can one conclude that today's anti spam solutions are working? This year spammers will use machine-generated programs to send trillions of unsolicited email. Thankfully, a new anti-spam technology has made its way into the market. more

How to Stop Spam

I got a letter the other day from AOL postmaster Carl Hutzler, about how the Internet community could get rid of spam, if it really wanted to. With his permission, here are some excerpts. "Spam is a completely solvable problem. And it does not take finding every Richter, Jaynes, Bridger, etc to do it (although it certainly is part of the solution). In fact it does not take email identity technologies either (although these are certainly needed and part of the solution)." more

Not a Guessing Game

On Tuesday July 8, CERT/CC published advisory #800113 referring to a DNS cache poisoning vulnerability discovered by Dan Kaminsky that will be fully disclosed on August 7 at the Black Hat conference. While the long term fix for this attack and all attacks like it is Secure DNS, we know we can't get the root zone signed, or the .COM zone signed, or the registrar / registry system to carry zone keys, soon enough. So, as a temporary workaround, the affected vendors are recommending that Dan Bernstein's UDP port randomization technique be universally deployed. Reactions have been mixed, but overall, negative. As the coordinator of the combined vendor response, I've heard plenty of complaints, and I've watched as Dan Kaminsky has been called an idiot for how he managed the disclosure. Let me try to respond a little here, without verging into taking any of this personally... more

Adult-Related TLDs Considered Dangerous

In an RFC prepared by Donald E. Eastlake 3rd and Declan McCullagh, an analysis is offered for proposals to mandate the use of a special top level name or an IP address bit to flag "adult" or "unsafe" material or the like. This document explains why these ideas are ill considered from legal, philosophical, and technical points of view: "Besides technical impossibility, such a mandate would be an illegal forcing of speech in some jurisdictions, as well as cause severe linguistic problems for domain or other character string names." more

Fake Bank Site, Fake Registrar

In our continuing review of Rogue Registrars we have stumbled upon on a very elaborate fake banking site for "Swiss Bank" or "Bank of Switzerland". To the casual Internet consumer this site probably appears legitimate, but a number of clues tip off the fraud. Phishing sites are everywhere so this does not immediately raise eyebrows until you review the Thick WHOIS record for the domain. more

Bug Reveals the Snooper in VeriSign’s Site Finder

Here's another interesting angle on the Verisign Site Finder Web site. VeriSign has hired a company called Omniture to snoop on people who make domain name typos. I found this Omniture Web bug on a VeriSign Site Finder Web page... more

IDN and Homographs Spoofing

There is a published spoofing attack using homographs IDN. By using a Cyrillic SMALL LETTER A (U+430), Securnia is able to pretend to be http://www.paypal.com/. Actually this is well-documented in RFC 3490 under the Security Consideration: "To help prevent confusion between characters that are visually similar, it is suggested that implementations provide visual indications where a domain name contains multiple scripts. Such mechanisms can also be used to show when a name contains a mixture of simplified and traditional Chinese characters, or to distinguish zero and one from O and l..." more

Who Is Blocking WHOIS? Part 2

We have just returned from the Brussels, Belgium ICANN meeting where we released our Registrar audit, the Internet "Doomsday Book." There are many topics covered in the report, but we wanted to follow up specifically on the issue of WHOIS access and add data to our previous column Who Is Blocking WHOIS? which covered Registrar denial of their contracted obligation to support Port 43 WHOIS access. more

When Registrars Look the Other Way, Drug-Dealers Get Paid

Since November of last year we have been discussing the problem of illicit and illegal online pharmacy support by ICANN-accredited Registrars. In several articles and direct contact with the Registrars we have tirelessly tried to convey the seriousness of this problem, many listened, some did not... With the background information already known, the case presented here is much more specific and concerns EvaPharmacy, which was until recently, the world's largest online criminal pharmacy network. more

On Mandated Content Blocking in the Domain Name System

COICA (Combating Online Infringement and Counterfeits Act) is a legislative bill introduced in the United States Senate during 2010 that has been the topic of considerable debate. After my name was mentioned during some testimony before a Senate committee last year I dug into the details and I am alarmed. I wrote recently about interactions between DNS blocking and Secure DNS and in this article I will expand on the reasons why COICA as proposed last year should not be pursued further in any similar form. more

The Anti-Phishing Consumer Protection Act of 2008

Last week Sen. Snowe filed bill S.2661, the Anti-Phishing Consumer Protection Act of 2008, or APCPA. While its goals are laudable, I have my doubts about some of the details. The first substantive section of the bill, Section 3, makes various phishy activities more illegal than they are now in its first two subsections. It makes it specifically illegal to solicit identifying information from a computer under false pretenses, and to use a domain name that is deceptively similar to someone else's brand or name on the web in e-mail or IM to mislead people... more

Internet Security Marketing: Buyer Beware

As security breaches increasingly make headlines, thousands of Internet security companies are chasing tens of billions of dollars in potential revenue. While we, the authors, are employees of Internet security companies and are happy for the opportunity to sell more products and services, we are alarmed at the kind of subversive untruths that vendor "spin doctors" are using to draw well-intentioned customers to their doors. Constructive criticism is sometimes necessarily harsh, and some might find the following just that, harsh. But we think it's important that organizations take a "buyers beware" approach to securing their business. more