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- ┌─────────────────────────────┐
- │ VIRUS REPORT │
- │ Icelandic 1 │
- └─────────────────────────────┘
-
- Synonyms: Saratoga 1, Icelandic, One in Ten, Disk Crunching Virus.
-
- Date of Origin: June, 1989.
-
- Place of Origin: Iceland.
-
- Host Machine: PC compatibles.
-
- Host Files: Remains resident. Infects EXE files.
-
- Increase in Size of Infected Files: 642 bytes. A variant adds 656 bytes.
- Another grows by 671 bytes. File lengths after infection are divisible
- by 16.
-
- Nature of Damage: Affects system run-time operation. Corrupts program
- files.
-
- Detected by: Scanv56+, F-Prot, Pro-Scan.
-
- Removed by: CleanUp, Scan/D, or F-Prot.
-
- Scan Code: Infected files always end with 44 18 5F 19. You can also
- search at offset 0C6H for 2E C6 06 87 02 0A 90 50 53 51.
-
- The Icelandic virus was first detected in June, 1989, disassembled a
- week later, and the disassembly was made available around the beginning
- of July. The basic Icelandic virus is a resident EXE-file infector that
- infects every second EXE file executed, and sometimes will mark a free
- cluster on a hard disk as bad (the "damage" routine).
-
- The Icelandic virus will copy itself to the top of free memory the
- first time an infected program is executed. Once in high memory, it hides
- from memory mapping programs. If a program later tries to write to this
- area of memory, the computer will crash. If the virus finds that some
- other program has "hooked" Interrupt 13, it will not proceed to infect
- programs. If Interrupt 13 has not been "hooked", it will attempt to
- infect every 10th program executed.
-
- The virus attaches itself to the end of the programs it infects, and
- infected files will always end with "4418,5F19"H.
-
- On systems with 12-bit FATs (floppy drives or 10 MB hard disks), the
- virus will not cause any damage. However, on systems with 16-bit FATs
- (hard disks larger than 10 MB), the virus will select one unused FAT
- entry and mark the entry as a bad sector each time it infects a program.
-
- It is likely that as of this writing, the virus has not been detected
- outside of Iceland. Several variants are known, including Saratoga 2,
- Icelandic Virus Version 2, and MIX1. See also the table.<Note: Prepared
- by Y. Radai, Hebrew University of Jerusalem.><$&3 Icelandic>
-
-
- ╔════════════════════════════════════════════════════════════════════╗
- ║ 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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