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- VIRUS-L Digest Thursday, 7 Dec 1989 Volume 2 : Issue 255
-
- VIRUS-L is a moderated, digested mail forum for discussing computer
- virus issues; comp.virus is a non-digested Usenet counterpart.
- Discussions are not limited to any one hardware/software platform -
- diversity is welcomed. Contributions should be relevant, concise,
- polite, etc., and sent to VIRUS-L@IBM1.CC.LEHIGH.EDU (that's
- LEHIIBM1.BITNET for BITNET folks). Information on accessing
- anti-virus, document, and back-issue archives is distributed
- periodically on the list. Administrative mail (comments, suggestions,
- and so forth) should be sent to me at: krvw@SEI.CMU.EDU.
- - Ken van Wyk
-
- Today's Topics:
-
- Differences... (PC)
- Re: scan problems (PC)
- I need a copy of m-jruslm.arc (PC)
- SCAN Versions (PC)
- Strange video - VIRUS SOLVED (PC)
-
- ---------------------------------------------------------------------------
-
- Date: Wed, 06 Dec 89 14:26:50 +0000
- From: frisk@rhi.hi.is (Fridrik Skulason)
- Subject: Differences... (PC)
-
- The question "How many different PC viruses are known ?" is a hard one.
- The two main reasons why it is so:
-
- 1) Some viruses have been reported, but not made available for research,
- so nobody has been able to compare them to existing viruses. In some
- cases there are even doubts that the viruses in question exist at all.
- The viruses in this group are "4096", "Nichols", "Missouri", "Agiplan",
- "Retro" and "Screen".
-
- 2) Even when the viruses are available for study, it is often hard to
- determine if two viruses are different or not.
-
- Consider the following possibilities:
-
- I Binary identical. No problem here - the viruses are identical.
-
- II Code is identical on the binary level - text strings changed.
- Some of the variants of "Brain" are a good example.
-
- III Identical on assembly language level. One example includes viruses
- created by typing in a disassembly and then assembling it, using an
- assembler different from the one originally used. Different
- assemblers will in many cases create different opcodes for the same
- instruction. (the POP/PUSH instructions for example). An example
- is the two variants of the "South African" virus that I have. One
- is an original, the other is created using the disassembly by Jim
- Goodwin.
-
- IV Minor changes to code, extra NOP instructions added or other changes
- made that have no effects on the function of the virus, but may
- invalidate search strings. The "Lisbon" virus is a good example
- of this.
-
- V Minor changes to code, different lengths, bug corrections, different
- activation dates and similar changes. Most of the 1701/1704 variants
- fall in this category, but also "Saratoga", "2930","Mix1-B" etc.
-
- VI Identical replication code, different functions. The "Sunday" virus
- is a good example of this. Also "Ghost", "1704-Format", "Typo" and
- "Advent".
-
- VII Partially identical code - very different functions. "Fu Manchu"
- is the best example.
-
- VIII Different code - identical functions. Example: The "ping-pong"
- effect in the MIX-1 virus.
-
- IX Different code, Functionally identical replication and/or infection
- mechanism. Different functions. No problem - different viruses.
-
- So, what do we do ? We need to define when we consider two viruses to be...
-
- ...different viruses
- ...different strains of the same virus
- ...not to be considered different
-
- Of course we can proceed from a different angle - select a few identification
- strings for each virus and then classify new viruses as follows:
-
- ... contains all the identfication strings of the old one -> same
-
- ... contains some of the identification strings -> new variant
-
- ... contains none of the identification strings -> new virus
-
-
- Or maybe use this method:
-
- ... the new virus can be removed by using the same program that was
- used to remove the old one -> identical
-
- ... only a single constant or two need to be changed to make it
- possible to use the same program to disinfect -> new variant
-
- ... new disinfection program/routine must be written -> new virus.
-
- My opinion is that those two suggestions are practically useless, since two
- different people working on the same virus may not reach the same conclusion.
-
- comments/suggestions ?
-
- - -frisk
-
- ------------------------------
-
- Date: Wed, 06 Dec 89 10:44:52 -0400
- From: Ken Bell <SYKLB@NASAGISS.BITNET>
- Subject: Re: scan problems (PC)
-
- > I just downloaded and uudecoded Scanv49.arc and Scanrs49.arc from
- > Simtel. The trouble is that when I try to execute either of them the
- > pc I'm using hangs!
-
- From the combination of this and the next quote, I'd guess that he's
- trying to execute the .ARC files directly instead of unarcing them
- first.
-
- > know I have a virus stalking around here and somehow attached to all
- > labelled disks which makes me believe it infected Label.com. Not only
- > that, I recently bought both Pctools 5.1 and Turbo C 2 & Assembler and
- > on doing executing simply Dir to check the contents of the diskettes
- > they all reported one hidden file with size 0 bytes! They couldn't
- > have left Central Points and Borland already infected! I've just found
- > out to my discomfort that practically all pc's here are infected.
-
- Yeah. It's the disk label (hidden file, 0 bytes).
- Acknowledge-To: <SYKLB@NASAGISS>
-
- ------------------------------
-
- Date: 06 Dec 89 23:01:47 +0000
- From: boulder!tramp!baileyc@ncar.UCAR.EDU (BAILEY CHRISTOPHER R)
- Subject: I need a copy of m-jruslm.arc (PC)
-
- I need someone to MAIL me a copy of m-jruslm.arc (avail most ftp
- places) because for some reason whenever I download from an ftp site,
- and then download it to my machine, these archives don't work. I'm
- not sure whats wrong at this moment. So if someone could mail me the
- Jeruselum/ 1813 virus disinfector I'd really appreciate it! I need it
- soon, have a computer program due tomorrow.
-
- Chris Bailey :: baileyc@tramp.Colorado.EDU
- One Agro Mountain Biker - Dialed in for ultra gonzo badness!
- "No his mind is not for rent, to any god or government" - RUSH
- Member of Team Buck Naked of Buckingham Palace
-
- ------------------------------
-
- Date: Wed, 06 Dec 89 13:28:31 -0800
- From: Alan_J_Roberts@cup.portal.com
- Subject: SCAN Versions (PC)
-
- This is a forward from John McAfee:
-
- The latest version of SCAN is SCANV50. While version 51 will be
- released on December 10, the currently reported V51, unless a re-numbered
- version of an earlier release, is not legitimate. If anyone has a copy
- of this file, please upload it to HomeBase at 408 988 4004.
- On another issue: Bob Gowan, Erik Sherk and others have inquired
- about disinfectors (programs that can remove viruses and repair infected
- files) for the various viruses. The individual disinfectors on HomeBase
- (M-JRUSLM for the Jerusalem, M-DAV for Dark Avenger, etc.) have been and
- still are available for public download. These individual disinfectors
- exist for the more common viruses, and SCAN version 50 and above contains
- a list of each virus and the required shareware disinfector.
- In addition, a program called VIRUS CLEAN is available for emergency
- access on HomeBase. This program disinfects all of the known PC viruses.
- It is not a shareware product, but free access is provided for emergency
- situations. For emergency access, call voice at 408 988 3832 for
- instructions.
-
- John McAfee
-
- ------------------------------
-
- Date: 07 Dec 89 07:15:58 +0000
- From: boulder!tramp!baileyc@ncar.UCAR.EDU (BAILEY CHRISTOPHER R)
- Subject: Strange video - VIRUS SOLVED (PC)
-
- Well, the strange video problems I was having were on account of the
- 1813 or Jeruselem (A I think) virus. I was able to remedy it by
- deleteing all the infected files and replacing them with safe backups.
- I used IBM's VIRSCAN program to detect it. I had been infected in 717
- places (about 60 files worth), and some floppies. I then tried
- VIRSCAN on my roommates disks, and found he had the Bouncing Ball
- virus! Sheesh! OUr network is submerged! Thanks, I no longer need a
- remedy/disinfectant!
-
- Chris Bailey :: baileyc@tramp.Colorado.EDU
- One Agro Mountain Biker - Dialed in for ultra gonzo badness!
- "No his mind is not for rent, to any god or government" - RUSH
- Member of Team Buck Naked of Buckingham Palace
-
- ------------------------------
-
- End of VIRUS-L Digest
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