Adaptec 2940U - AHA Storage Controller Ultra SCSI 20 MBps Información técnica descargar pdf (Pagina 109)

Chapter 4 Securing the Enterprise 95

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Protecting Against Viruses and Trojan Horses

It is extremely important to prevent intentional intrusions into your computer

network that take the form of viruses and Trojan horses. Viruses are programs that

attempt to spread from computer to computer and either cause damage (by erasing

or corrupting data) or annoy users (by printing messages or altering what is

displayed on the screen) on every computer they infect. Trojan horses are

programs that masquerade as other common programs while they attempt to

capture information.

An example of a Trojan horse is a program that masquerades as a system logon

screen in an attempt to capture user names and password information, which the

writers of the Trojan horse can later use to access the system.

How to Prevent Trojan Horse Attacks

Windows 2000 provides an important safeguard against Trojan horse programs.

Before you can log onto a Windows 2000 computer, you must press the secure

attention sequence, CTRL+ALT+DEL. This series of keystrokes always directly

invokes the Windows 2000 operating system logon screen; Trojan horse programs

are never activated this way. Users provide only their username and password to

the operating system itself. To ensure the effectiveness of this procedure, make

sure your users always press CTRL +ALT+DEL or CTRL +F1 in a

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session before logging on at a computer, even if the logon window is already on

the screen.

The secure attention sequence is also required before a user can unlock a locked

workstation or change his or her password.

Another way to guard against Trojan horses is to make your applications Read and

Execute only so that they cannot be replaced with programs that masquerade as

the original program to illegally obtain information.

How to Prevent Virus Outbreaks

Viruses are usually not intentionally introduced to your system. In most cases,

users unknowingly introduce a virus into your network when they obtain what

they believe to be a useful, safe program from another source, such as an online

bulletin board. Many network users are unaware that they can bring viruses into

the network this way. Therefore, one of the best ways to keep your network virus-

free is by educating your users.

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Adaptec 2940U - AHA Storage Controller Ultra SCSI 20 MBps Información técnica Pagina 109