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John Norstad
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Disinfectant 2.0b2
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Disinfectant 2.0b2.rsrc
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STR#_215.txt
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1990-06-12
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different and should not be confused with each other.
The MDEF and WDEF viruses have similar names, but they are completely
not become alarmed if you see them with ResEdit or some other tool.
MDEF resources are a normal part of the Macintosh system, so you should
The MDEF virus is named after the type of resource it uses to infect files.
systems.
menu behavior is the exact opposite of what happens on Vaccine-protected
they do work properly in the Finder and in uninfected applications. This
is unchanged. Menus do not work properly in infected applications, but
blocks the attempt by the virus to infect the System file. The System file
GateKeeper is totally effective against the MDEF virus. It successfully
repair these kinds of damaged System files.
Finder or in uninfected applications. Disinfectant will properly detect and
properly only in infected applications—they do not work properly in the
title in the menu bar, no menu pops down. Menus continue to work
is damaged and menus no longer work properly. When you press on a menu
from the System file to applications in this situation, but the System file
attempt by the virus to infect the System file. The virus cannot spread
properly notifies the user of the attack, but it blocks only part of the
Vaccine-protected systems, if an infected application is run, Vaccine
The MDEF virus has an unfortunate reaction with Vaccine. On
Mac Portable.
applications. We have not yet had the opportunity to test the virus on the
files, but it does not spread from infected systems to uninfected
IIci and IIfx, it spreads from infected applications to uninfected system
successfully on the 512KE, Plus, SE, SE/30, II, IIx, and IIcx. On the Mac
Macintoshes. It causes the Mac 128K and the 512K to crash. It spreads
For technical reasons, the MDEF virus only spreads on some kinds of
other than spread from file to file.
anyway. It does not beep, display messages or pictures, or do anything
MDEF does not intentionally attempt to do any damage, but it is harmful
system.
applications become infected as soon as they are run on an infected
The System file is infected as soon as an infected application is run. Other
document files. The Finder and DA Handler also usually become infected.
MDEF infects both applications and the System file. It does not infect
It is also sometimes called the “Garfield” virus.
The MDEF virus was first discovered at Cornell University in May, 1990.
xThe MDEF Virus
ˇˇ