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Trojan is a malware, no doubt. But is it a virus? While googled, got the following,

A Trojan horse may also be referred to as a Trojan horse virus, but that is technically incorrect. Unlike a computer virus, a Trojan horse is not able to replicate itself, nor can it propagate without an end user's assistance. Ref.

But in the book of Matt Bishop, "Computer Security: Art and Science", It says

Trojan horses can make copy of themselves

  • which means it is a virus.

Is is it a matter of debate or a matter of state (i.e. depends on the specific Trojan on how it behaves, can replicate or not).

Mohammad
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  • Thanks a lot. But, in fact, I found the difference between the Trojan and the virus. But the Trojan acts differently in different cases. It may reproduce itself (characteristics of virus) or may not have that capability. I need to clear this in a theoretical level for the purpose of my study. I hope it helps me to clear my perspective. Thanks again. – Mohammad Apr 21 '18 at 18:23
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    IMO both terms just emphasize an aspect of behavior of a piece of malware. (Trojans deceive, viruses replicate.) Beyond that, definitions can vary and overlap. – Arminius Apr 21 '18 at 18:31

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