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- Newsgroups: comp.compression
- Path: sparky!uunet!mcsun!Germany.EU.net!rzsun2.informatik.uni-hamburg.de!fbihh!bontchev
- From: bontchev@fbihh.informatik.uni-hamburg.de (Vesselin Bontchev)
- Subject: Re: PKZ204C.EXE *NOT* INFECTED, or ...???
- Message-ID: <bontchev.726336153@fbihh>
- Sender: news@informatik.uni-hamburg.de (Mr. News)
- Reply-To: bontchev@fbihh.informatik.uni-hamburg.de
- Organization: Virus Test Center, University of Hamburg
- References: <bontchev.726270248@fbihh> <1750@ictser.UUCP>
- Date: 6 Jan 93 16:02:33 GMT
- Lines: 47
-
- weegink@ictser.UUCP (Han Weegink) writes:
-
- > Isn't it true, that all one can prove is ***presence*** of viri,
- > not ***absence*** ?
-
- It is so when you are using a known-virus scanner. I analyzed the
- files manually with a debugger.
-
- > The fact that the virusscanners didn't all identify a virus
- > merely proves that the virus they are looking for is not
- > present. But what about new viri ???
-
- I am in the field since more than four years and I -am- able to
- recognize a virus (even if it is new) when I see one... Sometimes it
- might take me some time to decide whether a suspiciously-looking code
- is a virus or not. And, as I wrote even in my original message, I did
- not limit myself to the usage of scanners, like most of you seem to
- have done. I analyzed the executables manually. I GUARANTEE THAT THEY
- ARE NOT INFECTED! In the worst case they could be trojan horses made
- to drop viruses - and this could be made only by the person who has
- written the program - a program that actually works and -is- an
- archiver and -is- a better archiver than the currently known version
- 1.93. Any common sense should tell you that the probability that
- somebody spends so much time just to produce a virus dropper that will
- be discovered almost at once when it first drops the virus is
- effectively zero. Note that I am speaking about the probability of the
- files being trojan horses; the probability of them being infected IS
- ZERO, BECAUSE THEY ARE NOT.
-
- > BTW, I used to use PKZIP a lot until I found out that it sometimes
- > has serious problems unzipping archives (making me loose some
- > valuable work in the proces :-(
-
- I am not saying that the program is bug-free; just that it is NOT
- INFECTED.
-
- > Now I use ARJ230, which has worked without a flaw, thisfar.
-
- Same with me, BTW, but this is irrelevant to the discussion.
-
- 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
-