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- ┌─────────────────────────────┐
- │ VIRUS REPORT │
- │ Lehigh │
- └─────────────────────────────┘
-
- Date of Origin: late 1987.
-
- Place of Origin: Lehigh University, Pennsylvania.
-
- Host Machine: PC compatibles.
-
- Host Files: Remains resident. Infects COMMAND.COM.
-
- Increase in Size of Infected Files: overwrites files.
-
- Nature of Damage: Corrupts program or overlay files. Overwrites the FAT
- and boot sector after infecting four floppies.
-
- Detected by: Scanv56+, F-Prot, IBM Scan, Pro-Scan.
-
- Removed by: CleanUp, or use MDisk and replace COMMAND.COM with a clean
- copy, or use F-Prot.
-
- Scan Code: 50 53 80 FC 4B 74 08 80 FC 4E 74 03 E9 77 01 8B DA 80 7F 01 3A
- 75 05 8A 07 EB 07. You can also search at offset 01CH for B4 19 CD 44 04
- 61 1E 51 52 57.
-
- History: This is a COMMAND.COM infector that first surfaced at Lehigh
- University in late 1987. It is one of the best known of viruses, and
- widely discussed and analyzed.
-
- Description of Operation: Infects only COMMAND.COM, where it overwrites
- the stack space. If a disk which contains an uninfected copy of
- COMMAND.COM is accessed, that copy is also infected. A count of
- infections is kept within each copy of the virus, and when this count
- reaches 4, every disk (including hard disks) currently in the computer
- is trashed by overwriting the initial tracks (boot sector & FAT).
- Infection changes the date and time of the infected file. If a floppy
- with an uninfected COMMAND.COM is write-protected, there will be a
- "WRITE PROTECT ERROR" message from DOS.
-
- I have reprinted below the warning that Kenneth van Wyk distributed
- on this virus.
-
- "WARNING: MS-DOS COMMAND.COM "virus" program will
- reformat your disks!!
-
- "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 problems.
-
- "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 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."<Note: Kenneth R. van
- Wyk, User Services Senior Consultant, Lehigh University Computing
- Center, (215)-758-4988>
-
- The Lehigh original virus has been sporadically reported at dozens
- of installations outside of the university for over a year. It is not a
- particulary successful replicator <197> probably because of the
- extremely short activation fuse - and it is difficult to detect and
- report because there are few symptoms prior to activation. But there
- should certainly be no surprise that it's in the public domain.
-
- John McAfee has written: "The belief that viruses can be contained by
- early counter-action is belied by the Lehigh University experience. I
- have spoken to a number of individuals at the University who belived
- that the virus had somehow been contained because "no copies of the
- virus were distributed to outside organizations". This assumed, of
- course, that the original virus writer gave up after being foiled at
- Lehigh and did not insert the virus at any other location, and that all
- copies of the virus at Lehigh had indeed been accounted for. The first
- issue rests solely in the hands of the perpetrator and is beyond any
- containment controls. The second issue relies on an error-free
- containment process - allowing no possibility for overlooking, losing or
- mistaking an infected diskette. In any case, the Lehigh virus was by no
- means contained. I received a copy, as did virtually every virus
- researcher, in mid-1988, and infection reports issued throughout the
- year from universities, corporations and individual computer users."
-
-
- ╔════════════════════════════════════════════════════════════════════╗
- ║ This document was adapted from the book "Computer Viruses", ║
- ║ which is copyright and distributed by the National Computer ║
- ║ Security Association. It contains information compiled from ║
- ║ many sources. To the best of our knowledge, all information ║
- ║ presented here is accurate. ║
- ║ ║
- ║ Please send any updates or corrections to the NCSA, Suite 309, ║
- ║ 4401-A Connecticut Ave NW, Washington, DC 20008. Or call our BBS ║
- ║ and upload the information: (202) 364-1304. Or call us voice at ║
- ║ (202) 364-8252. This version was produced May 22, 1990. ║
- ║ ║
- ║ The NCSA is a non-profit organization dedicated to improving ║
- ║ computer security. Membership in the association is just $45 per ║
- ║ year. Copies of the book "Computer Viruses", which provides ║
- ║ detailed information on over 145 viruses, can be obtained from ║
- ║ the NCSA. Member price: $44; non-member price: $55. ║
- ║ ║
- ║ The document is copyright (c) 1990 NCSA. ║
- ║ ║
- ║ This document may be distributed in any format, providing ║
- ║ this message is not removed or altered. ║
- ╚════════════════════════════════════════════════════════════════════╝
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