home *** CD-ROM | disk | FTP | other *** search
- VIRUS-L Digest Tuesday, 20 Dec 1988 Volume 1 : Issue 53
-
- Today's Topics:
- Viruses in Commercial Software; Write-Tabs
- Thwarting the Brain... (PC)
- Cold boot vs. warm boot... (PC)
- Virus file and the nets
-
- ---------------------------------------------------------------------------
-
- Date: Mon, 19 Dec 88 18:19:42 EST
- From: Steve <XRAYSROK@SBCCVM.BITNET>
- Subject: Viruses in Commercial Software; Write-Tabs
-
- In regard to Homer Smith's letter about his risks from unintentional
- virus contamination of the commercial disks he produces:
-
- 1) Disks containing only source code are *not* absolutely safe, but
- they would be much safer, in my opinion, if carefully examined. There
- is nothing to prevent a virus or some such thing from writing hidden
- files or storing things in "bad" sectors where the average person
- doing a DIR wouldn't see them. Furthermore, a virus could write the
- essential part of itself onto the boot sector (like brain does) and
- wait for someone to boot their system with the disk in place, at which
- time it could become active.
-
- 2) I would recommend that you periodically examine your disks for
- known viruses (like looking at the boot sector with Norton utilities
- or the like) and running detection programs for known viruses. It
- should not be necessary to examine every single disk --- only a small
- representative sample, assuming that potential viruses will always
- infect a disk if presented (except that one can imagine a virus that
- only attacks on Tuesdays). For example, periodically inspect some of
- the most recent disks and also whenever you have introduced something
- from outside your system (e.g. a new program or somebody else's disk).
- If you don't have the time or perhaps expertise, I would think it
- would be well worth your while to get someone to do it for you (at
- least find out which programs you should be using to look for
- viruses). Does anybody know of anyone who specializes in examining
- other people's disks for viruses (like for $)?
-
- 3) If you keep the system used to produce your product well
- isolated, then your risks should be lessened considerably.
-
- 4) Maybe consulting a lawyer would help, but couldn't you state in
- the fine print in the literature distributed with your disks that you
- have taken great pains to isolate your system (and product) from
- potential sources of viral contamination, and that you regularly check
- your system and disks for common, known viruses... BUT (here comes
- the disclaimer) you assume no responsibility for anything harmful that
- might be on any of your disks, and that the buyer in buying the
- product acknowledges this and uses it at his own risk? That is, you
- state that you have taken every reasonable measure to protect the
- consumer, but for legal reasons wash your hands of any liability --- a
- licensing agreement.
-
- 5) About a virus writing on a disk inspite of a write-protect tab,
- I don't believe it. I think there must be a misunderstanding
- somewhere. I suppose the details of enforcing a write-lock vary, but
- they all rely on hardware that disables the write-mode of the disk
- drive. There is no way software can circumvent this protection,
- unless your drive is defective and the write-lock-tab feature isn't
- working properly.
-
- Steven C. Woronick | Disclaimer: I'm just a physicist. These are
- Physics Dept. | entirely my own opinions and not necessarily
- SUNY | anybody else's and may not even be right...
- Stony Brook, NY 11794 |
- Acknowledge-To: <XRAYSROK@SBCCVM>
-
- ------------------------------
-
- Date: Mon, 19 Dec 88 17:43 EST
- From: <MATHAIMT@VTCC1.BITNET>
- Subject: Thwarting the Brain... (PC)
-
- Reading all the comments about the brain virus one thing becomes
- clear: It can be detected because it announces itself in the Boot
- record with messages like "Welcome to the dungeon", "BRAIN COMPUTER
- SERVICES" etc etc etc... I can't help but wonder what would happen if
- some wily person decided to create his or her own strain with
- absolutely no messages (including not modifying the volume label). I
- shudder even as I write this. Could detection be that easy then
- atleast for lay persons like me. Most of the preventive measures that
- I've read so far say something like "Use a disk editor like Norton
- Utilities and examine the Boot record. If you see a message saying
- Brain etc etc, then your disk is infected" What if there were no
- messages. I c wouldn't know the difference between the boot record of
- an uninfected disk and that of an infected disk.(of late I've been
- peering into the boot record of every 5.25" floppy I own ! Thats how
- paranoid I've become) . What's a possible solution. Pre formatted
- floppy disks of two kinds (bootable and non bootable) where only the
- manufacturer does any work with the boot record. (Vendors are already
- sellin g pre formatted disks so thats not so absurd, is it?) A
- special material for the boot record which can cause it to be read but
- not written to, except by special devices which only manufacturers
- will own. This may seem off the wall right now but I think we all
- need to think of some solution to this "modification of boot record"
- business, especially because most programs can't treat it like a
- normal file and hence can't check for any changes to the boot record.
- (I'm referring to programs like flushot and checkup which can be made
- to check files for changes since the last run). Any
- comments/additions to the theme?
-
- Mathew Mathai
- Virginia Tech
- bitnet : MATHAIMT@VTCC1
-
- ------------------------------
-
- Date: 19 December 1988 21:22:30 CST
- From: "Michael J. Steiner " <U23405@UICVM.BITNET>
- Subject: Cold boot vs. warm boot... (PC)
-
- How can a virus stay "effective" after a warm boot? Aren't both kinds of
- boots the same? (Evidently, there must be differences; what are they?)
-
- Michael Steiner
- Email: U23405@UICVM.BITNET
-
- ------------------------------
-
- Date: Mon, 19 Dec 88 22:38:24 PST
- From: Robert Slade <USERCE57@UBCMTSG.BITNET>
- Subject: Virus file and the nets
-
- I am being flooded with requests for the files, so you may get delayed
- responses.
-
- You may also get no responses. For some reason, many messages get through to
- me, but the return path won't work. Sorry about that. Not much I can do.
-
- KLOTZBUECHER@MPI-MUELHEIM.MPG.DBP.DE - he changed his name to "Silver Donald
- Cameron. What disks do you use? $15-20.
-
- ------------------------------
-
- End of VIRUS-L Digest
- *********************
-
-
- Downloaded From P-80 International Information Systems 304-744-2253
-