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- Last week, some of our student consultants discovered a virus program
- that's been spreading rapidly throughout Lehigh University. I thought
- I'd take a few minutes and warn as many of you as possible about this
- program since it has the chance of spreading much farther than just our
- University. We have no idea where the virus started, but some users have
- told me that other universities have recently had similar probems.
- The virus: the virus itself is contained within the stack space of COMMAND.COM.
- When a pc is booted from an infected disk, all a user need do to spread
- the virus is to access another disk via TYPE, COPY, DIR, etc. If the
- other disk contains COMMAND.COM, the virus code is copied to the other
- disk. Then, a counter is incremented on the parent. When this counter
- reaches a value of 4, any and every disk in the PC is erased thoroughly.
- The boot tracks are nulled, as are the FAT tables, etc. All Norton's
- horses couldn't put it back together again... :-) This affects both floppy
- and hard disks. Meanwhile, the four children that were created go on
- to tell four friends, and then they tell four friends, and so on, and
- so on.
- Detection: while this virus appears to be very well written, the author
- did leave behind a couple footprints. First, the write date of the
- command.com changes. Second, if there's a write protect tab on an
- uninfected disk, you will get a WRITE PROTECT ERROR... So, boot up from
- a suspected virus'd disk and access a write protected disk - if an
- error comes up, then you're sure. Note that the length of command.com
- does not get altered.
- I urge anyone who comes in contact with publicly accessible (sp?) disks
- to periodically check their own disks. Also, exercise safe computing -
- always wear a write protect tab. :-)
- This is not a joke. A large percentage of our public site disks has
- been gonged by this virus in the last couple days.
- Kenneth R. van Wyk
- User Services Senior Consultant
- Lehigh University Computing Center
- (215)-758-4988
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