Download Viruses Revealed by C. David Harley PDF
By C. David Harley
Protect your process opposed to the genuine possibility of desktop viruses with aid from this accomplished source. Up-do-date and informative, this e-book provides a full-scale research on trojan horse security. via use of case reports depicting genuine virus infestations, this advisor presents either the technical wisdom and functional options essential to shield opposed to the expanding possibility of virus assaults.
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Extra resources for Viruses Revealed
Example text
This is not the case. A polymorphic remains the same virus but cannot be detected by looking for a characteristic scan string within the possibly infected file (or other infectable object). The code remains essentially the same, but the expression is different, so that the same program is represented by a different sequence of bytes. This by no means indicates, however, that polymorphic viruses are undetectable, though the first examples contributed to the disappearance of a number of early anti-virus products published by vendors who couldn’t handle the problem.
Yet, we’re willing to bet that you’ve been told some unbelievable things about viruses—we certainly have. Please be patient while we challenge some of those common and misplaced assumptions. Definitions A major problem with viruses, as we shall try to make clear in this and the next chapter, lies in the fact they are not automatically identifiable. Viruses, or any kind of self-reproducing programs, only use functions that are used by other programs and that are necessary for other operations.
This does not mean that the vendors are purposely misleading you, by the way (at least, not always). It simply means that the problem is too complex to be served well in the context of this introduction. If you want to know more right now, you’ll have to skip ahead to Chapter 3 (on virus epidemiology in general) and Chapter 8 (on information gathering and risk assessment). So let’s go back to the question we asked at the beginning of this section. How many viruses are there? Answer: tens of thousands, by almost anyone’s reckoning.