home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!think.com!yale.edu!jvnc.net!netnews.upenn.edu!netnews.cc.lehigh.edu!news
- From: grweiss@phoenix.princeton.edu (Gregory Robert Weiss)
- Newsgroups: comp.virus
- Subject: Re: Good use of (possible bad) viruses
- Message-ID: <0020.9301071651.AA16031@barnabas.cert.org>
- Date: 6 Jan 93 16:50:11 GMT
- Sender: virus-l@lehigh.edu
- Lines: 84
- Approved: news@netnews.cc.lehigh.edu
-
- celustka@sun.felk.cvut.cs (Celustkova-k336-doktorand(Richta)) writes:
- >Hi boys and girls, (a day of inspiration,huh ?)
- >
- >Just one of those days...Two examples of good use of (possible bad)
- >viruses come to my mind :
- >
- >1. Viruses written to improve an A-V product
- >
- >The logic is simple. It is better that I write virus which can do this
- >or that and have prepared solution to implement in my A-V product than
- >wait that such virus arises in wild and then react. That means if I
- >know that today exist viruses which could be stealthy, tunneling or
- >polymorfic why shouldn't I write virus which is all that and design my
- >A-V product to recognize such virus before it really appears in wild.
- >(Well, maybe it is not commercial, I don't know).
-
- Developing solutions for anticipated problems is quite reasonable; however,
- the following statement isn't:
-
- >If such virus *by
- >accident* escape from my lab I already have a response and there is no
- >ethical problem at all.
-
- No problems if it "accidently escapes"...
- - unless of course you developed the virus and it "escaped by accident"
- before you had your A-V program properly detecting it.
- - unless you think about the fact that most people will not use *your* A-V
- program, they'll use someone else's, or maybe even no protection at all.
- - unless you consider that and you will create a lot of work for
- other A-V writers, and damage to others in the meantime.
-
- These problems are both technical and ethical problems that you must
- confront before doing this kind of work, IMHO.
-
- >2. Viruses built in an A-V product (it's just an idea, don't blame me if it
- >is not applicable in reality)
- >
- >Suppose that we have an A-V product which in regular intervals or
- >randomly send a virus in system. Virus (fast infector) infects only
- >programs which checksum doesn't correspond to previously calculated
- >values. If no such program is found virus deletes itself or removes
- >from memory. If changed program found virus activates scanner to check
- >if there is any known virus. If known virus is found message is sent
- >to the user. If program is changed and no known virus is found the
- >message is sent to the user to make decision.
-
- This sounds fine and good for a strictly contained system owned by an
- A-V writer (note the dangers mentioned in my previous comment above),
- but will be *absolutely, fundamentally worthless* in an A-V product
- as you describe, because you are describing a system in which the
- virus is discovered (and hopefully removed) only *after* files have been
- damaged. The point of having A-V products is to prevent the damage in
- the first place.
-
- So now my financial records which I hadn't backed up for a
- month or two (or more...) are damaged: my A-V virus says the checksum has
- changed. Well, I'm glad that I caught that virus, even though it destroyed
- the data file I was trying to protect! :-)
-
- The reason why many A-V products are TSRs is to catch viruses *as* they
- enter the system, not *after* they enter the system. Your A-V virus
- seems to fall short in this regard.
-
- > If decision is to leave
- >program as is, virus cuts itself from the program. The whole process
- >(except messages) takes place in background. There is no need for all
- >A-V program (which is combination of I-checker and scanner) to be TSR,
- >only virus is occasionally TSR. There is slight similarity in this
- >idea with reaction of human immunity system. Anyone has ethical
- >problem with her/his own immunity system ?
-
- I understand your comparison is tongue-in-cheek, but you really are comparing
- apples and oranges here. In the immune system, a few cells can die, but
- your body can still function properly. Computer data files and programs
- are much less forgiving of a few errors.
-
- >Cheeeers,
- >
- >Suzana
-
- Happy New Year everyone!
-
- --Greg
- grweiss@phoenix.princeton.edu
-