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- From: bontchev@fbihh.informatik.uni-hamburg.de (Vesselin Bontchev)
- Newsgroups: comp.virus
- Subject: Re: Viral Based Distribution System
- Message-ID: <0018.9301062041.AA14693@barnabas.cert.org>
- Date: 5 Jan 93 22:40:49 GMT
- Sender: virus-l@lehigh.edu
- Lines: 54
- Approved: news@netnews.cc.lehigh.edu
-
- ygoland@edison.SEAS.UCLA.EDU (The Jester) writes:
-
- > Yes.. I understand. And may I say I STRONGLY disagree with Dr.
- > Cohen's definition.
-
- Any human-language definition will be inexact. For an exact definition
- you should check his mathematical definition that involves Turing
- machines... I think it is explained in his paper "Computational
- Aspects of Computer Viruses", published in "Computers & Security". It
- is also explained in his Ph.D. thesis (although the paper is better)
- and is mentioned (without any explanation, which is rather confusing)
- in his booklet "A Short Course on Computer Viruses".
-
- > A program in the login script that checks if you
- > have been updated and then updates you is NOT a virus. The program in
- > the loader does NOT reproduce itself it reproduces another program
- > which is itself NOT a virus.
-
- No, you still do not understand. The "virus" is not just the login
- script - it is the whole package. The login script is just the active
- segment that seeks for "infectable" machines and transfers the rest of
- the "virus code". It is actually a worm, but Cohen's definition does
- not seem to make a difference between a virus and a worm.
-
- > loader installs an infected program =) For me the acid test of a virus
- > is:Can it reproduce itself?
-
- Correct. So, the copy of the anti-virus package on the server
- reproduces itself on each workstation when this workstation tries to
- log in. Automatic update. Reproduction. Virus-like behavior.
-
- > Is the login script programming trying to
- > run around and find other login scripts or executable files to infect?
-
- Another misunderstanding comes from the fact that most people
- distinguish between a "virus" (i.e., something that modifies
- executable files) and a "worm" (i.e., something that copies itself as
- a whole). While it is useful to make such a distinguishment for
- practical reasons, there is no real theoretical difference (e.g., what
- "files" do the boot sector viruses infect? How about the companion
- viruses? They do not modify anything...).
-
- > No. It doesn't infect anyone! 'Damnit Jim, its not alive!'
-
- Yup, it does. It "infects" the workstation with a copy of the
- "virus/worm" - the anti-virus package.
-
- Regards,
- Vesselin
- - --
- Vesselin Vladimirov Bontchev Virus Test Center, University of Hamburg
- Tel.:+49-40-54715-224, Fax: +49-40-54715-226 Fachbereich Informatik - AGN
- < PGP 2.1 public key available on request. > Vogt-Koelln-Strasse 30, rm. 107 C
- e-mail: bontchev@fbihh.informatik.uni-hamburg.de D-2000 Hamburg 54, Germany
-