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- ┌─────────────────────────────┐
- │ VIRUS REPORT │
- │ 1536 │
- └─────────────────────────────┘
-
- Synonyms: Zero Bug.
-
- Date of Origin: September, 1989.
-
- Place of Origin: the Netherlands.
-
- Host Machine: PC compatibles.
-
- Host Files: Remains resident. Infects COM files.
-
- OnScreen Symptoms: A smiley face character
- may appear on the screen and "eat" any 0's it can find.
-
- Increase in Size of Infected Files: 1536 bytes.
-
- Nature of Damage: Affects system run-time
- operation. Corrupts program or overlay files.
-
- Detected by: Scanv38+, F-Prot
-
- Removed by: CleanUp, Scan/D, F-Prot, or delete
- infected files.
-
- The Zero Bug virus was first isolated in the Netherlands by Jan
- Terpstra in September, 1989. This virus is a memory resident .COM file
- infector. Infected .COM files will increase in size by 1,536 bytes,
- however the increase in file length will not show up when the disk
- directory is displayed.
-
- The virus's main objective is to infect the copy of COMMAND.COM
- indicated by the environment variable COMSPEC. If COMSPEC doesn't point
- to anything, the Zero Bug virus will install itself memory resident
- using INT 21h.
-
- After the virus has either infected COMMAND.COM or become memory
- resident, it will infect all COM files that are accessed, including
- those accessed by actions such as COPY or XCOPY. Any COM file created on
- an infected system will also be infected.
-
- If the currently loaded COMMAND.COM is infected, the virus will hook
- into the timer interrupt 1Ch, and after a certain amount of time has
- past, a smiley face character (ASCII 01) will appear and eat all the
- zeros it can find on the screen. The virus does not delete files or
- format disks in its present form.
-
-
- ╔════════════════════════════════════════════════════════════════════╗
- ║ 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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