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DNS Tunneling (Ab)Uses

Abuse of global DNS infrastructure for the purpose of distributed denial-of-service (DDoS) attacks on various Internet services has been a hot topic in the news for some time now. But there is another...

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DNS Gang Wars of the Wild Wild East

What does running the DNS infrastructure of a major ISP have in common with operating an online gambling site based in China? If you are running DNS operations of any scale then you are almost...

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A DNS cache-busting technique for DDOS-style attacks against Authoritative...

During the course of a recent analysis of DNS traffic at a customer site, I noticed a high volume of requests had been made for a relatively small set of domains. As it turned out, the traffic was part...

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Cloudmark’s 2014 Annual Security Threat Report

It’s been a hot year for messaging security. In our 2014 Annual Security Threat Report we take a look at, among many other topics, findings of DNS resource exhaustion/water boarding at a major ISP, a...

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People Who Could Really Break The Internet

Among the many security failures of the past few months there has been one notable success. The Internet proved that it was robust enough to withstand Papermag.com’s Break the Internet edition. It’s...

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Cloudmark’s 2015 Q1 Global Threat Report

With articles on the rise and fall of a major spammer, the pros and cons of DNSSEC, Canada’s Anti Spam Law, ransoming your data, home router compromises, and casino advertising that went too far,...

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Using DNS for “Local” Threat Intelligence

In a session I attended at the RSA Conference in San Francisco, one of the panelists was asked a question in the Q&A section about detecting malware that stays entirely in memory, i.e. Avoiding...

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DANE and Email Security

The forthcoming Cloudmark Security Platform for Email 5.2 will include support for DNS-Based Authentication of Named Entities (DANE), a new protocol that enables increased security for email...

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