Kaspersky Security Bulletin. Spam and phishing in 2015

In 2015, the proportion of spam in email traffic decreased by 11.48 percentage points and accounted for 55.28%. The largest decline was observed in the first quarter; from April the fluctuations stabilized and were within a few percentage points. This reduction was caused by the migration of advertising for legal goods and services from spam flows to more convenient and legal platforms, as well as by the expansion of the “gray” zone in mass mailings. Read Full Article

Hidden tear and its spin offs

A while ago Turkish security group Otku Sen created the hidden tear ransomware and published the source code online. Idea behind it was to “teach” security researchers how ransomware works. Right from the beginning the reaction of various security professionals was negative. And we were right, it didn’t take long before the first ransomware variants arrived based on the hidden tear source code. Read Full Article

From Linux to Windows – New Family of Cross-Platform Desktop Backdoors Discovered

Recently we came across a new family of cross-platform backdoors for desktop environments. First we got the Linux variant, and with information extracted from its binary, we were able to find the variant for Windows desktops, too. Not only that, but the Windows version was additionally equipped with a valid code signing signature. Let´s have a look at both of them. Read Full Article

Malware on the Smart TV?

In a comment on Reddit this week, user “moeburn” raised the possibility of new malware circulating for Smart TVs. We immediately got to work trying to figure out if this threat was targeting connected televisions specifically or whether this was an accidental infection. Read Full Article