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- åRecommendations
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- There is no need to panic over the current virus situation. However, you
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- should take the problem seriously. Using Disinfectant, it only takes a few
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- minutes per week to effectively protect your Macintosh against the known
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- viruses.
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- • If you do nothing else, religiously use the Disinfectant INIT. It only takes
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- a minute to install and it can save you much grief.
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- • Keep original software on locked floppies. Use copies. When you obtain a
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- new piece of software, immediately lock the disk on which it came, make
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- a copy, and use the copy. Never unlock the original disk. It is impossible
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- for a virus to infect files on a locked floppy.
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- • Make periodic backups of your hard drive, at least once per week.
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- • Keep your anti-viral software up-to-date. This is very important. Old
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- versions of anti-viral software are very often ineffective against new
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- viruses. This is particularly true of Disinfectant, which only protects
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- against known viruses and makes no attempt to detect new viruses. If you
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- do not have access to a reliable source of information about new
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- Disinfectant releases, we recommend that you use a commercial
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- anti-viral product instead of Disinfectant. Purchase a product which
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- offers an update service.
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- For most people, this is all you have to do to protect your personal
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- Macintosh. It is not necessary to scan all new software before using it or
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- to scan all floppy disks before using them. This is a waste of time. As long
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- as you have the INIT properly installed, it will detect and block viruses
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- before they can spread or cause any damage.
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- It is also not necessary to scan your hard drives frequently. Let the
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- protection INIT do its job and trust it.
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- You should, however, periodically do a full scan of all your hard drives
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- just to make certain that they are still uninfected. For example, if you
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- start up from a floppy disk which does not have the Disinfectant INIT
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- installed, it is possible for a virus to infect your hard drives. Doing a scan
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- every once in a while will detect any such infections.
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- One strategy which many people use is to do a full scan just before every
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- backup. This has the added advantage that it makes certain your backups
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- are clean.
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- The remaining recommendations are for people who manage Mac
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- networks, Mac laboratories, Mac bulletin boards, or collections of public
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- domain and shareware software. An environment where many people
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- share Macs, or share a Mac network, is a perfect breeding ground for
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- viruses. People who sell software also have a special responsibility to
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- make certain that their software is free from infection.
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- • Install the Disinfectant protection INIT on all your lab startup disks.
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- • Check all your lab disks frequently with Disinfectant to make certain
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- that they are uninfected. Also check to make certain that the Disinfectant
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- protection INIT is still installed and active on all your startup disks. We
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- have discovered that students love to play with the start-up disks.
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- • Educate the people in your organization about viruses and how to protect
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- against them. Give them copies of Disinfectant and teach them how to use
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- the application. Distribute printed copies of the Disinfectant manual.
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- • Consider creating a special “virus scanning station” in your lab. See
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- the section about the Preferences window for details.
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- • Try to put software in write-protected folders on AppleShare server
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- disks. Viruses cannot infect applications if they are in folders which do
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- not have the “Make Changes” privilege. On the other hand, if an
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- application is in a writable server folder, any infected Mac on the
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- network which accesses the disk and uses the application might spread the
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- infection to the application on the server. If it is a popular application, it
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- will in turn quickly infect any other Macs on the network which are not
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- protected by a protection INIT. This is one way in which viruses can
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- spread very rapidly. Since some applications insist on writing to their
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- own file or folder, it is not always possible to put applications in
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- write-protected folders, but you should make every attempt to do this
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- when it is possible.
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- • Check server disks frequently with Disinfectant to make certain they
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- are uninfected. For best results, you should take the server out of
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- production and restart it using your Virus Tools or Disk Tools disk. This is
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- the only way to guarantee that Disinfectant will be able to scan all the
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- files on the server disk. At Northwestern, we try to check all our
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- servers once per week. For more details on scanning servers, see the
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- discussion in the “Special Features” section.
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- • Check all new software with Disinfectant before installing it on a
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- server.
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- • Back up your servers frequently. Run Disinfectant just before each
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- backup.
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- • The WDEF virus can cause serious performance problems if it infects an
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- AppleShare server. To avoid these problems, administrators should never
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- grant the “make changes” privilege on server root directories. We also
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- recommend deleting the Desktop file if it exists. See the section about the
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- WDEF virus for details.
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- • Bulletin board operators and other people who maintain and distribute
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- public domain and shareware software have a special responsibility to the
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- Mac community. Please carefully test all new software before
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- distributing it. You should also, of course, run Disinfectant on all new
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- software you receive.
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- • If you sell software, please check your master disks for infections
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- before sending them out to be duplicated and distributed.
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