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- From: mcafee@netcom.com (McAfee Associates)
- Newsgroups: comp.virus
- Subject: Re: SCAN 95b doesn't find MtE in EXE files (PC)
- Message-ID: <0003.9211191448.AA21875@barnabas.cert.org>
- Date: 17 Nov 92 07:32:33 GMT
- Sender: virus-l@lehigh.edu
- Lines: 110
- Approved: news@netnews.cc.lehigh.edu
-
- Hello Vesselin,
-
- you write
- [a ">>" means I write]
-
- [...part about SCAN 97 missing representative samples from each set
- of your MtE-based viruses deleted for brevity...]
-
- > Unless, of course, you mean my previous
- >message, in which I stated that SCAN 95b does NOT detect the MtE-based
- >viruses in ANY infected EXE files AT ALL, which is also true.
-
- Correct. SCAN 95-B was released before we had any samples of
- MtE-based viruses which infected .EXE files. Detection was added in
- V97 (the V96 release was skipped due to a Trojan horse).
-
- >Regardless which of my messages you meant, they are both true and I
- >have facts that prove both of them. If you consider my message about
- >those facts to be alarmist, you are free to think so. Try to explain
-
- Okay.
-
- >it to your users. But please, don't object the facts. The facts are
-
- I have been :-). I don't believe I was objecting to your results.
-
- >that SCAN is still unable to detect reliably ANY of the MtE-based
- >viruses. It was my duty to warn its users about this.
-
- [... my comments about MtE-based virus spread deleted...]
-
- >I am not arguing about how widespread the MtE-based viruses are. They
- >are not. What I am arguing about is that SCAN 97 is not able to detect
- >reliably ANY of them. For a known virus, there is no such thing as
- >99.8% detection. You either can detect it, or you cannot. Try
-
- Are you sure? I can see two opposing schools of thought forming here:
- One of "all or nothing" detection (the binary operation school of
- thought), and one of "percentages" of detecting (the analog school of
- thought)? Without getting too far off track, here, I believe that
- there will be more "percentage" reports in the future, especially as
- more complex forms of viral code emerge.
-
- >explaining your users that they should not be alarmed, because SCAN
- >misses "only" about one infected file in every 50. Besides, 319 missed
- >samples of 15,994 is 98% (not 99.8%), i.e. one missed sample in every
- ^^^^^^^^^^^^^^^
- My mistake. Sorry about that.
-
- >50.
-
- [...my suggestion for wording of reports deleted...]
-
- >OK, I'll use this wording the next time. But I will not miss to say
- >that "SCAN version xx missed X out of Y samples of the Z virus, which
- >means that this version of SCAN is NOT able to detect the Z virus
- >reliably. I've notified McAfee Associates of the problem and they will
- >(hopefully) fix it shortly."
-
- <GRIN> Beautiful.
-
- >> >an article posted somewhere (maybe even here), which described how
- >> >McAfee Associates sponsored a particular set of anti-virus product
- >> >evaluations and insisted that only old versions of the scanners of
- >> >their main competitors were tested.
- >
- >> McAfee Associates has sponsored (that is, paid for) anti-virus product
- >> testing by a number of independent organizations, using then-available
- >> versions of competitors' anti-viral programs. To do otherwise would be
- >> worthless.
- >
- >More exactly, the article said that McAfee insisted that OLD versions
-
- The article (I wish I knew which one) could have have said that. It
- does not mean that it is true, though.
-
- >of the competitive scanners were used in those tests and that he was
- >quoted saying that he wants his competitors to show worse results in
- >such tests. To do otherwise might be worthless from the economical
-
- I think its fairly easy to guess that John McAfee would like his programs
- to do better then anyone else's in a test. I'm sure that is hardly
- unique, though.
-
- >point of view, but it would be honest from the human point of view...
-
- [...deleted...]
- >I hope so. This is one of the reasons for posting my message. Just
- >have in mind that the bugs in security-related software (like
- >anti-virus programs) are more dangerous. I'll do my best to continue
- >reporting them.
-
- If possible, would you mind sending me a copy of any such reports? (Only
- on McAfee Associates software, that is). Thank you.
-
- Regards,
-
- Aryeh Goretsky
- Technical Support
-
- PS: SCAN V99 should be available about the time you read this. I'd
- be very interested in hearing how it does--the MtE-based virus
- detector was rewritten. AG
- - --
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