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The number of viruses in circulation is growing all the time and so are the
methods for transferring them.
When viruses first appeared, the technology in use meant that they were
mainly transferred by the exchange of computer discs. Now, they are spread
through more diverse routes such as embedded files, e-mails and web pages with
active content.
You can minimise your own risk of virus infection with:
- User vigilance
- Virus defence software
- Virus defence strategy
- Alert services
The best approach is to use common sense, and the most effective solutions
use a combination of the points above.
The following checklists describe some general steps to take to prevent a
virus infection:
User Vigilance
Environment
- Keep the office physically secure. Intruders using
infected floppy discs have been known to introduce viruses deliberately
E-mail
- Do not attempt to open any suspicious e-mails or
attachments. Treat as suspicious e-mails from:
- Anonymous senders
- Strangers addressing you in a familiar manner
- Non-standard addresses
- Be especially wary of any of the above that contain
attachments with .EXE, .SCR or VBS file extension names
Malicious programmes can also lurk in more familiar forms. For example,
Microsoft Word and Excel attachments can contain macro viruses.
- Never forward virus warning messages to everyone on an
e-mail list or contact group. This can spread just as fast and cause as many
problems as a virus
- Never forward funny or joke programmes to others. If
you must pass information, send them the URL link and not the programme file
itself
- If you are in any doubt, save suspicious attachments
to your local directory, then use virus defence software to examine it in
more detail
A simple check is to telephone the alleged sender (if possible) to confirm
their identification and credentials.
Virus Defence Software
Basic technical solutions should include the following:
- Ensure that virus defence software is installed! Virus
protection software is readily available from specialist virus protection
companies and also from many PC outlets on the high street
- Ensure that your virus defence software is
appropriate.
Every company has different needs, depending on their technical
infrastructure, geographic spread and dependency on technology
- Use your virus defence software to scan all e-mail
attachments before opening them
- Ensure that your virus defence software has an 'on
access' function and use it. This type of scanning takes place constantly,
automatically checking every file, programme, or document each time it is
opened or used
- Keep your virus defence software up to date
- Keep your Internet browser up to date by patching it
regularly. Most browser updates include new security elements to meet newly
identified virus threats. If in doubt, refer to your vendor or their website
for advice
Virus Defence Strategy
Technical solutions need to be managed. Define a virus defence strategy for
your organisation, addressing:
- Gateway virus checking
- Server virus checks
- Desktop workstation virus checks
- Update mechanisms for virus defence software
- Isolation policy in the event of a virus infection
- Recovery procedures
Alert Services
A number of companies specialising in virus information and/or virus defence
software, provide alert services. Alerts are sent by e-mail, whenever there is a
new virus outbreak or other Internet security threat.
These companies can prove a good source of information for viruses in general
and for specific types of virus.
If alerts are used, they should be combined with a practical procedure for
updating the systems at risk, including servers, desktop PCs and Laptop
computers.
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