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- *** Reports collected and collated by ***
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- *** to the authors ***
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-
- ALABAMA VIRUS
- =============
-
- Extract form Virus-L 2:214
-
- Date: Thu, 05 Oct 89 14:33:43 +0200
- From: Y. Radai, Hebrew University of Jerusalem
-
- Two new viruses have been discovered in Israel. One of them is
- called the Alabama virus (The other, reported separately, was 4K).
-
- It infects EXE files and increases their size by 1560 bytes.
-
- Unlike many other resident viruses, it does not use Int 21h function
- 31h to stay resident. It loads itself 30K under the highest memory
- location reported by DOS, but (unlike MIX1) it does not lower the
- amount of memory reported by BIOS or DOS.
-
- It hooks Int 9 and checks for Ctrl-Alt-Del. (It uses IN and OUT
- commands to confuse anti-virus people.) When it identifies this com-
- bination it causes an apparent boot but remains in RAM.
-
- After 1 hour of operation (the virus checks the time on each Int 9
- or Int 21 call), the following flashing boxed message appears:
-
- SOFTWARE COPIES PROHIBITED BY INTERNATIONAL LAW..............
- Box 1055 Tuscambia ALABAMA USA.
-
- This virus does not necessarily infect the file which is currently
- being executed. First it looks for an uninfected file in the
- current directory, and if it finds one it infects it. Only if it
- does not find one does it infect the executed file.
-
- But sometimes, when it finds an uninfected file, instead of infect-
- ing it, it will *exchange* it with the currently executed file
- without renaming it, so that the user will think that he is
- executing one pro- gram while he is actually executing another one!
-
- My thanks to Eli Shapira for this info.
-
- Y. Radai Hebrew Univ. of
- Jerusalem
-
-
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