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- ┌─────────────────────────────┐
- │ VIRUS REPORT │
- │ 123nhalf │
- └─────────────────────────────┘
-
- Date of Origin: September, 1989.
-
- Host Machine: 80286-based micros.
-
- Host Files: 123DOS.EXE
-
- Increase in Size of Infected Files: 3907 bytes.
-
- Nature of Damage: removes 1/2 of rows, columns in 1-2-3 ver. 3
- spreadsheet file.
-
- This virus was so named because it causes a Lotus 1-2-3 release 3
- spreadsheet to be saved exactly one half the size it should be.<Note: For
- example, a 100 x 100 cell spreadsheet will only be saved as a 50 x 50 cell
- spreadsheet.>
-
- The 123DOS.EXE file grows in size (one time) by 3907 bytes. Any
- spreadsheet saved after the virus has infected the file is exactly half
- the size of what it should be. If the 123DOS.EXE file is erased and
- restored from a backup, and 1-2-3 is run again, the file again grows in
- size.
-
- This virus will only infect the 123DOS.EXE file, when running on a
- machine with a '286 processor. it will not infect the file on a '386
- system. The virus also will not infect files unless there is a minimum of
- 3 megabytes of extended memory. Expanded memory does not matter and does
- not come into the picture.
-
- Something is missing from our current understanding of this virus:
- if the virus infects only 123DOS.EXE, how do you get it? How would it
- spread? (Why, that is, would an infected copy of 123DOS.EXE ever find
- itself running with access to an uninfected copy; why would there ever be
- two different copies of the file on the same machine?). It is possible
- that the virus spread through the disks during production, or that it
- comes in with other software, and looks for 123DOS.EXE.
-
- 123SCAN.EXE detects the 123nhalf virus.
-
-
- ╔════════════════════════════════════════════════════════════════════╗
- ║ 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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