SEI Insights


Vulnerability Insights

Hi, this is Vijay Sarvepalli, Security Solutions Engineer in the CERT Division again. In my earlier blog post, I offered some ideas for applying set theory in your SOC (Security Operations Center). This time I introduce you to statistics, specifically standard deviation. Mathematical terms such as standard deviation can seem mysterious for daily security operations. However, I've provided some simple examples to help you analyze network security data using this measurement.

Hello, Jonathan Foote here. In this post I'll explain how to use information from databases in stock Ubuntu systems to gather the parameters needed to perform corpus distillation (gathering of seed inputs) and fuzzing against the installed default file type handlers in Ubuntu Desktop 12.04. This technique applies to most modern versions of Ubuntu.

Hello, this is Jonathan Spring. I've been investigating the usage of domains that are typos of other domains. For example, is a typo of, and it's a common one since 'f' is next to 'g' on the standard keyboard. The existing hypothesis has been that typo domains would be used for malicious purposes. Users would commonly mistype the domain they are going to, and some of the less scrupulous domain owners could take advantage of this to trick them or infect their computers.

Hello, this is Leigh Metcalf and Jonathan Spring. In this post, we first examine some of the usage patterns in the .tv top-level DNS zone via passive DNS. In the second half of the post, we explore the economic importance of the .tv domain to its owner, the small South Pacific island nation of Tuvalu. Combining these two analyses, it seems that suspicious domain names could be one of Tuvalu's more valuable exports.