Expert content, for researchers by researchers


Win32/KanKan – Chinese drama

In this blog post, we will describe software detected by ESET products as Win32/Kankan, and explain why its discovery shocked many Chinese users, then we will provide an in-depth analysis of its functionalities - and discuss the evidence that Xunlei Networking Technologies is implicated.

Filecoder: Holding your data to ransom

Trojans that encrypt user files and try to extort a ransom from the victim in exchange for a decryptor utility are nothing new. We’ve noted a significant increase in Filecoder activity over the past few summer months - in this blog post we address the questions we’re getting about this issue.

Hesperbot – Technical analysis part 1/2

Win32/Spy.Hesperbot is a new banking trojan that has been targeting online banking users in Turkey, the Czech Republic, Portugal and the United Kingdom. For more information about its malware spreading campaigns and victims, refer to our first blog post. In this post we’ll cover the technical details of the malware, including the overall architecture, as well as the mobile component.

Nymaim – obfuscation chronicles

We look at malware delivered by a campaign that has infected thousands of websites around the world - and the various control flow obfuscation techniques that make its analysis as interesting as it is challenging.

Versatile and infectious: Win64/Expiro is a cross-platform file infector

Recently, our anti-virus laboratory discovered an interesting new modification of a file virus known as Expiro which targets 64-bit files for infection. File-infecting viruses are well known and have been studied comprehensively over the years, but malicious code of this type almost invariably aimed to modify 32-bit files. One such family of file viruses, called