Category Archives: DNS

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 detection by never writing itself to disk. The panelist’s answer was insightful; he stated that malware still needs to communicate with […]

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, Cloudmark’s Threat Report for 2015 Q1 covers the latest in the cyber threat landscape. We normally imagine that most spam sent […]

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 deeper look at the highest volume spam campaign to reach Apple iMessage users to date, and delve into the a […]

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

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 of an attack on the customer’s DNS infrastructure; however, the point of these requests was initially […]

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 certainly participating in a world wide racketeering campaign specifically targeting online gambling sites, many of which operate out of China […]

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 unintended use of DNS that can be exploited for a wide range of purposes: DNS tunneling. These purposes can range from benign […]

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