Joanna Rutkowska writes: "At the beginning of this year, at Black Hat Federal Conference, I proposed a simple taxonomy that could be used to classify stealth malware according to how it interacts with the operating system. Since that time I have often referred to this classification as I think it is very useful in designing system integrity verification tools and talking about malware in general. Now I decided to explain this classification a bit more as well as extend it of a new type of malware - the type III malware."
Before I start describing various types of malware, I would like to first define what I understand by the term malware: Malware is a piece of code which changes the behavior of either the operating system kernel or some security sensitive applications, without a user consent and in such a way that it is then impossible to detect those changes using a documented features of the operating system or the application (e.g. API).
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