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- From: bontchev@fbihh.informatik.uni-hamburg.de (Vesselin Bontchev)
- Newsgroups: comp.virus
- Subject: Re: Virus Simulator MtE Suppliment (PC)
- Message-ID: <0012.9301062041.AA14693@barnabas.cert.org>
- Date: 5 Jan 93 18:39:30 GMT
- Sender: virus-l@lehigh.edu
- Lines: 66
- Approved: news@netnews.cc.lehigh.edu
-
- as194@cleveland.Freenet.Edu (Doren Rosenthal) writes:
-
- > Thank you for your comments on my Virus Simulator MtE Supplement. I'll be
- > mailing the first copies january 1, so I hope your opinion is mistakenly
- > based on my original Virus Simulator and not your technical review of a
- > program you could not possibly have examined yet. Readers of this forum may
- > recall the considerable controversy and strong opinion you expressed
- > beginning two weeks before my release of that program as well.
-
- Well, Frisk's comments about your Virus Simulator turned out to be
- right even after it appeared, so I would guess that he understands the
- principles behind such "test" tools even better than you do...
-
- > pattern to avoid recognition. A few examples of viruses that employ this
- > same MtE engine are:
- >
- > Pogue, Dame, MtE, Gotcha, 7S, Mut, Dedicated, Fear, Groove, Coffee Shop,
- > MtE-Spawn, Questo, Crypto Lab, Encroach.
-
- Corrections: By "7S" you probably mean "Seventh_Son" ("7S" is how SCAN
- calls it) and it is NOT based on MtE. "Dame" is not a virus, it is
- just how SCAN call -all- MtE-based viruses. Gotcha is NOT an MtE-based
- virus. Dunno what you are calling "Mut" but I know about no such
- MtE-based virus. The CARO name for "MtE-Spawn" is "Insufficient". The
- correct spelling of the last two names is "CryptLab" and "Encroacher".
- "MtE" is not a virus; it is a tool for building polymorphic viruses.
-
- When looking at the names you quoted, I am getting the impression that
- you knowledge about the names of the existing MtE-based viruses is
- based on the reports generated by SCAN, since it sometimes reports the
- unencrypted variants of Pogue as "Gotcha" (which is correct - Pogue is
- actually a Gotcha variant with MtE polymorphism added), and one of the
- older versions of SCAN reported "7S" in some unencrypted variants of
- one of the other MtE-based viruses (not certain about that; have to
- check).
-
- > Although the MtE simulations produced by my program are safe and
- > controlled, they are real viruses, capable of infecting their special dummy
- > host programs.
-
- So, you are not only distributing malicious software (MtE) but also
- real viruses, hmm? Anyway, Frisk's comment is still valid. The ability
- of a scanner to detect "your" viruses may or may not be related to its
- ability to detect -real- MtE-based viruses.
-
- > Vigilant anti-virus programs that are capable of reliably
- > detecting the MtE mutation engine should report these simulations as being
- > infected.
-
- Usually, yes, but not necessarily. It depends on how your viruses
- infect their victims, how often they are generating unencrypted
- replicants, how exactly the particular scanner works, and so on. As I
- said, it may or it may not be connected with the actual ability of the
- scanner to detect the existing MtE-based viruses... But if a scanner
- - -doesn't- detect some of "your" viruses, this is a serious reason for
- further investigation. It does not necessarily mean that that
- particular scanner will also miss a real MtE-based virus, but it is
- worth checking why it misses your virus...
-
- 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
-