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VACCINE
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1995-04-19
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Antiviral vaccine for MS DOS executable files (*.EXE)
Developped by Rustam M. Abdrakhimov (rust@vnukovo.msk.su)
The vaccine is intended to prevent running of vaccined program after
infecting by almost any virus (including stealth). Only two special types of
virii cann't be recognized by the vaccine.
Usually vaccine doesn't enlarge size of a file. Increase of file size
may be up to 256 byte.
You can vaccinate any executable (*.EXE) file for DOS. A vaccined file
works right always, except self-checking files, that don't need a vaccination.
Command-line format:
VACCINE [options] <Path+Name>
Path+Name:
The name of file for vaccination with full or truncated path.
Wildcards ( "*" and "?") allowed.
If you vaccinate group of file, using of *.EXE extention is recommended.
Otherwise *.DLL files and other files with DOS header may be vaccinated too.
Options:
Version 1.0 allows 5 options: y,b,r,d,a
-y - Assume "Yes" automatical on question about increasing size of vaccinating
file. Otherwise increasing of file size must be confirmed every time.
-b - Make *.BAK files with old version of vaccinated files. Using this option
for vaccinating one file is recommended, but it is not recommended
for vaccinating any group of files.
-r - Recurse subdirerctories. Use this option to vaccinate all files in
current directory and subdirectories.
-d - Delete code of vaccine from vaccinated files. Warning: a restored file may
be different from the original state of the file.
-a - Vaccinate Read/Only files.