Symantec 10551441 - AntiVirus Corporate Edition User manual

Symantec AntiVirus™
Corporate Edition Client Guide

Symantec AntiVirus™ Corporate Edition Client Guide
The software described in this book is furnished under a license agreement and may be
used only in accordance with the terms of the agreement.
Documentation version 10.0
Copyright Notice
Copyright © 2005 Symantec Corporation.
All Rights Reserved.
Any technical documentation that is made available by Symantec Corporation is the
copyrighted work of Symantec Corporation and is owned by Symantec Corporation.
NO WARRANTY. The technical documentation is being delivered to you AS-IS, and
Symantec Corporation makes no warranty as to its accuracy or use. Any use of the
technical documentation or the information contained therein is at the risk of the user.
Documentation may include technical or other inaccuracies or typographical errors.
Symantec reserves the right to make changes without prior notice.
No part of this publication may be copied without the express written permission of
Symantec Corporation, 20330 Stevens Creek Blvd., Cupertino, CA 95014.
Trademarks
Symantec, the Symantec logo, LiveUpdate, Norton AntiVirus, and Norton SystemWorks
are U.S. registered trademarks of Symantec Corporation. Norton Internet Security, Norton
Personal Firewall, Symantec AntiVirus, Symantec Client Firewall, Symantec Client
Security, Symantec Desktop Firewall, Symantec Enterprise Security Architecture,
Symantec Packager, Symantec Security Response, and Symantec System Center are
trademarks of Symantec Corporation.
Other brands and product names mentioned in this manual may be trademarks or
registered trademarks of their respective companies and are hereby acknowledged.

Technical support
As part of Symantec Security Response, the Symantec global Technical Support
group maintains support centers throughout the world. The Technical Support
group’s primary role is to respond to specific questions on product feature/
function, installation, and configuration, as well as to author content for our
Web-accessible Knowledge Base. The Technical Support group works
collaboratively with the other functional areas within Symantec to answer your
questions in a timely fashion. For example, the Technical Support group works
with Product Engineering as well as Symantec Security Response to provide
Alerting Services and Virus Definition Updates for virus outbreaks and security
alerts.
Symantec technical support offerings include:
■A range of support options that give you the flexibility to select the right
amount of service for any size organization
■Telephone and Web support components that provide rapid response and
up-to-the-minute information
■Upgrade insurance that delivers automatic software upgrade protection
■Content Updates for virus definitions and security signatures that ensure
the highest level of protection
■Global support from Symantec Security Response experts, which is
available 24 hours a day, 7 days a week worldwide in a variety of languages
for those customers enrolled in the Platinum Support Program
■Advanced features, such as the Symantec Alerting Service and Technical
Account Manager role, offer enhanced response and proactive security
support
Please visit our Web site for current information on Support Programs. The
specific features available may vary based on the level of support purchased and
the specific product that you are using.
Licensing and registration
If the product that you are implementing requires registration and/or a license
key, the fastest and easiest way to register your service is to access the
Symantec licensing and registration site at www.symantec.com/certificate.
Alternatively, you may go to www.symantec.com/techsupp/ent/enterprise.html,
select the product that you wish to register, and from the Product Home Page,
select the Licensing and Registration link.
Contacting Technical Support
Customers with a current support agreement may contact the Technical
Support group via phone or online at www.symantec.com/techsupp.
Customers with Platinum support agreements may contact Platinum Technical
Support via the Platinum Web site at www-secure.symantec.com/platinum/.

When contacting the Technical Support group, please have the following:
■Product release level
■Hardware information
■Available memory, disk space, NIC information
■Operating system
■Version and patch level
■Network topology
■Router, gateway, and IP address information
■Problem description
■Error messages/log files
■Troubleshooting performed prior to contacting Symantec
■Recent software configuration changes and/or network changes
Customer Service
To contact Enterprise Customer Service online, go to www.symantec.com, select
the appropriate Global Site for your country, then choose Service and Support.
Customer Service is available to assist with the following types of issues:
■Questions regarding product licensing or serialization
■Product registration updates such as address or name changes
■General product information (features, language availability, local dealers)
■Latest information on product updates and upgrades
■Information on upgrade insurance and maintenance contracts
■Information on Symantec Value License Program
■Advice on Symantec's technical support options
■Nontechnical presales questions
■Missing or defective CD-ROMs or manuals

Contents
Technical support
Chapter 1 Introducing Symantec AntiVirus
About Symantec AntiVirus .................................................................................. 9
About updating stand-alone computers ................................................... 10
About remote computers that connect to a corporate network ........... 11
About viruses ........................................................................................................ 11
How viruses spread ...................................................................................... 12
Virus types .................................................................................................... 12
About the master boot record .................................................................... 13
About security risks ............................................................................................14
How Symantec AntiVirus responds to viruses and security risks ............... 16
How Symantec AntiVirus protects your computer ........................................ 17
What keeps Symantec AntiVirus protection current ....................................18
About the role of Symantec Security Response ......................................19
How virus and security risk protection is updated ................................. 19
Chapter 2 Symantec AntiVirus basics
About content licensing ...................................................................................... 21
Installing a content license to an unmanaged client .............................22
Opening Symantec AntiVirus ............................................................................ 23
Navigating in the Symantec AntiVirus main window ................................... 24
Viewing Symantec AntiVirus categories .................................................25
Enabling and disabling Auto-Protect ............................................................... 30
Pausing and delaying scans ............................................................................... 31
Keeping virus and security risk protection current .......................................33
Scheduling updates with LiveUpdate .......................................................33
Updating protection immediately with LiveUpdate .............................. 35
Updating without LiveUpdate ................................................................... 35
Using Symantec AntiVirus with Windows Security Center .......................... 36
For more information ......................................................................................... 37
Accessing online Help ................................................................................. 37
Accessing the Symantec Security Response Web site ........................... 38

6Contents
Chapter 3 Protecting your computer from viruses and security risks
About the antivirus and security risk policy ................................................... 39
What to scan ................................................................................................. 40
What to do if a virus or security risk is detected .................................... 42
Using Auto-Protect .............................................................................................. 43
About Auto-Protect and security risks ..................................................... 43
About Auto-Protect and email scanning .................................................. 44
Disabling email scanning if you use SSL connections ........................... 45
Viewing Auto-Protect Scan Statistics ....................................................... 45
Modifying Auto-Protect and using SmartScan ....................................... 46
Disabling and enabling security risk scanning in Auto-Protect .......... 46
Using Tamper Protection ................................................................................... 47
Enabling, disabling, and configuring Tamper Protection ..................... 47
Creating Tamper Protection messages .................................................... 48
Scanning for viruses and security risks ........................................................... 50
How Symantec AntiVirus detects viruses and security risks ............... 50
What happens during a scan ...................................................................... 51
About definitions files ................................................................................ 52
About scanning compressed and encoded files ..................................... 52
Initiating manual scans .............................................................................. 52
Configuring scanning .......................................................................................... 55
Creating scheduled scans ........................................................................... 55
Creating startup scans ................................................................................ 57
Creating user-defined scans ....................................................................... 59
Editing and deleting startup, user-defined, and scheduled scans ....... 60
Configuring actions for viruses and security risks ................................ 61
Configuring notifications for viruses and security risks ....................... 67
Interpreting scan results .................................................................................... 71
Excluding files from scans ................................................................................. 73
Chapter 4 What to do if a virus or security risk is found
Acting on infected files ....................................................................................... 75
About damage that viruses cause .............................................................. 77
About the Quarantine ......................................................................................... 77
Move files that are infected by viruses to the Quarantine .................... 77
Leave files that are infected by security risks in the Quarantine ........ 78
Delete files that are infected by viruses in the Quarantine .................. 78
Delete files that are infected by security risks in the Quarantine ....... 78

7Contents
Managing the Quarantine ..................................................................................79
Viewing files and file details in the Quarantine ......................................79
Rescanning files in the Quarantine for viruses ...................................... 79
When a repaired file can’t be returned to its original location ............ 81
Clearing Backup Items ................................................................................ 82
Deleting files from the Quarantine ........................................................... 82
Automatically purging files from the Quarantine, Backup Items,
and Repaired Items ............................................................................. 83
Submitting a potentially infected file to Symantec Security Response
for analysis ............................................................................................ 84
Viewing the Event Log ....................................................................................... 84
Filtering items in the Event Log ................................................................ 85
About clearing items from the Event Log ............................................... 86
Exporting data to a .csv file ....................................................................... 86
Index

8Contents

Chapter 1
Introducing Symantec
AntiVirus
This chapter includes the following topics:
■About Symantec AntiVirus
■About viruses
■About security risks
■How Symantec AntiVirus responds to viruses and security risks
■How Symantec AntiVirus protects your computer
■What keeps Symantec AntiVirus protection current
About Symantec AntiVirus
You can install Symantec AntiVirus™ virus and security risk protection as either
a stand-alone or an administrator-managed installation. A stand-alone
installation means that your Symantec AntiVirus software is not managed by a
network administrator.
If you manage your own computer, it must be one of the following types:
■A stand-alone computer that is not connected to a network, such as a home
computer or a laptop stand-alone, with a Symantec AntiVirus installation
that uses either the default option settings or administrator-preset options
settings
■A remote computer that connects to your corporate network that must meet
security requirements before connecting

10 Introducing Symantec AntiVirus
About Symantec AntiVirus
The default settings for Symantec AntiVirus provide virus and security risk
protection for your computer. However, you may want to adjust them to suit
your company’s needs, to optimize system performance, and to disable options
that do not apply.
If your installation is managed by your administrator, some options may be
locked or unavailable, or may not appear at all, depending upon your
administrator’s security policy. Your administrator runs scans on your
computer and can set up scheduled scans.
Your administrator can advise you as to what tasks you should perform by using
Symantec AntiVirus.
Note: Options that display a padlock icon are not available because they have
been locked by your administrator. You cannot change these options unless the
administrator unlocks them.
About updating stand-alone computers
Stand-alone computers may be connected to the Internet. In Symantec
AntiVirus documentation, the term stand-alone takes on an added dimension.
Stand-alone computers are not connected to a server; thus they do not receive
virus and security risk definitions updates from the server, and cannot be
managed by the Symantec System Center administrator program.
If you installed Symantec AntiVirus on a stand-alone computer, you are
responsible for updating the virus and security risk definitions. New definitions
files are available several times each month from Symantec. You will be alerted
when definitions files need replacing.
You can update the virus and security risk definitions files with LiveUpdate™.
LiveUpdate retrieves the new definitions files from a Symantec site, and then
replaces the old definitions files in the Symantec AntiVirus directory. A modem
or Internet connection is required.
See “Updating protection immediately with LiveUpdate” on page 35.

11Introducing Symantec AntiVirus
About viruses
About remote computers that connect to a corporate network
Remote computers that connect to a corporate network can receive virus and
security risk definitions, and can be managed by the Symantec System Center
administrator program.
System administrators may require remote computers that connect to a
corporate network to meet some security requirements. For example, the
computer may have to run Symantec AntiVirus with the most up-to-date virus
and security risk definitions before it can connect to the network. The computer
may be denied access to the network until it meets the security requirements.
About viruses
A virus is a computer program that attaches a copy of itself to another computer
program or document when it runs. Whenever the infected program runs or a
user opens a document containing a macro virus, the attached virus program
activates and attaches itself to other programs and documents.
Viruses generally deliver a payload, such as displaying a message on a particular
date. Some viruses specifically damage data by corrupting programs, deleting
files, or reformatting disks.
A worm is a special type of virus that replicates itself from one computer to
another and can use memory. Worms generally exist inside other files, such as
Microsoft® Word or Excel documents. A worm may release a document that
already has the worm macro inside of it.
Ablended threat combines the characteristics of viruses, worms, Trojan horses,
and malicious code with server and Internet vulnerabilities to initiate, transmit,
and spread an attack. Blended threats use multiple methods and techniques to
propagate and attack, and cause widespread damage throughout a network.
In the context of Symantec AntiVirus, the term virus is used to cover all threats
that work in a virus-like manner. Symantec AntiVirus can detect, delete, and
quarantine viruses, and repair the side effects of viruses.
A security risk is a known program, in a category such as adware or spyware,
that may or may not present a risk to the security of a computer. Symantec
AntiVirus can detect, quarantine, and repair the side effects of risks in these
security risk categories.
See “About security risks” on page 14.

12 Introducing Symantec AntiVirus
About viruses
How viruses spread
Viruses can spread through any network, modem, or magnetic medium. Most
boot viruses can only spread by way of floppy disks. Multipartite viruses are
especially elusive because they can travel as file viruses, infect boot sectors, and
be transmitted through floppy disks.
The growth of LAN, Internet, and global email connectivity has accelerated the
rate at which viruses can spread. A localized virus outbreak can quickly spread
to another part of a company or the world when infected files are sent through
email. The primary threat of virus infection comes from files that are shared,
and then opened and used.
Virus types
Viruses are classified by what they infect and how they attempt to evade
detection. The basic virus types are defined by the area of the computer that
they infect, such as boot viruses, file viruses, and macro viruses.
Other types of destructive code include worms and Trojan horses. These types of
destructive code are different than viruses because they don’t replicate.
Boot viruses
Boot viruses insert instructions into the boot sectors of floppy disks, or the boot
sector or master boot record (partition sector) of a hard disk. Boot viruses are
some of the most successful viruses.
When the computer starts from an infected floppy disk, the virus infects the
hard disk and loads its code into memory. The floppy disk does not have to be a
startup disk for the virus to spread. The virus remains memory-resident and
infects any floppy disks that are accessed. A floppy disk or hard disk with an
infected boot sector won’t infect any files unless the virus is also multipartite. A
true boot virus can’t spread to a server or over the network.
See “About the master boot record” on page 13.
File viruses
File viruses attach to executable files such as .com, .exe, and .dll files by
inserting instructions into the execution sequence. When the infected file runs,
the inserted instructions execute the virus code. After the code finishes
executing, the file continues with its normal execution sequence. This happens
so quickly that you’re not aware that the virus executed.

13Introducing Symantec AntiVirus
About viruses
There are three subclassifications of file viruses:
■Memory-resident: Stay in memory as terminate-stay-resident (TSR)
programs and typically infect all executed files.
■Direct action: Execute, infect other files, and unload.
■Companion: Associate themselves with executable files without modifying
them. For example, the virus might create a companion file, Word.com, and
attach it to the Word.exe file. When the Word program opens, the infected
Word.com file executes, performs the virus activities, and then executes the
Word.exe file.
The damage that is caused by file viruses ranges from irritating, such as
displaying screen messages, to data destroying.
Macro viruses
Unlike other viruses, macro viruses do not infect program files; they infect
documents. Common targets for many macro viruses are word processors such
as Microsoft Word and Lotus AmiPro®, and spreadsheets like Microsoft Excel.
Word uses macros to perform actions such as formatting text and opening or
closing a document. Macro viruses can modify macros that are defined by the
Word application to perform malicious actions such as overwriting or redefining
default definitions in Word.
The damage that is caused by macro viruses can range from inserting unwanted
text into documents to significantly reducing the functionality of a computer.
Macro viruses that infect Word commonly target the macros that are associated
with the Normal.dot template. This template is global, so all of your Word files
can be infected.
About the master boot record
The master boot record is contained on the first sector of a hard drive. Part of
the process of starting a computer includes giving control to the hard disk. Also,
a program is located in the first sector of the hard disk that enables the
operating system to load into random access memory (RAM).
Boot viruses can damage the master boot record by moving, overwriting, or
deleting it. For example, the Monkey virus moves the master boot record to the
hard drive’s third sector, and then places its own code in the first sector. Moving
the master boot record makes starting from the hard drive impossible.
See “Boot viruses” on page 12.

14 Introducing Symantec AntiVirus
About security risks
About security risks
Security risks are classified by the behavior in which they engage and the
purpose for which they appear to be designed. Unlike viruses and worms,
security risks do not self-replicate.
Symantec AntiVirus can detect, quarantine, delete, and remove or repair the
side effects of security risks in the following categories:
■Spyware: Stand-alone programs that can secretly monitor system activity
and detect information like passwords and other confidential information
and relay the information back to another computer.
Spyware can be unknowingly downloaded from Web sites (typically in
shareware or freeware), email messages, and instant messenger software.
You may unknowingly download spyware by accepting an End User License
Agreement from a software program.
■Adware: Stand-alone or appended programs that can secretly gather
personal information through the Internet and relay it back to another
computer. Adware may track browsing habits for advertising purposes.
Adware can also deliver advertising content.
Adware can be unknowingly downloaded from Web sites (typically in
shareware or freeware), email messages, and instant messenger software.
You may unknowingly download adware by accepting an End User License
Agreement from a software program.
■Dialers: Programs that use a computer, without your permission or
knowledge, to dial out through the Internet to a 900 number or FTP site,
typically to accrue charges.
■Hack tools: Programs that are used by a hacker to gain unauthorized access
to your computer. For example, one hack tool is a keystroke logger, which
tracks and records individual keystrokes and can send this information
back to the hacker. The hacker can then perform port scans or vulnerability
scans. Hack tools may also be used to create tools for virus creation.
■Joke programs: Programs that can alter or interrupt the operation of a
computer in a way that is intended to be humorous or frightening. For
example, a program can be downloaded from Web sites (typically in
shareware or freeware), email messages, or instant messenger software. It
can then move the trash can away from the mouse when you attempt to
delete or cause the mouse to click in reverse.
■Other: Security risks that do not conform to any other security risk
category, but that may present a security risk to your computer and its data.

15Introducing Symantec AntiVirus
About security risks
■Remote access: Programs that allow access over the Internet from another
computer to gain information or to attack or alter your computer. For
example, you may install a program, or it may be installed as part of some
other process without your knowledge. The program can be used for
malicious purposes with or without modification of the original remote
access program.
■Trackware: Stand-alone or appended applications that trace a user's path
on the Internet and send information to a target system. For example, the
application can be downloaded from Web sites, email messages, or instant
messenger software. It can then obtain confidential information regarding
user behavior.
By default, all Symantec AntiVirus scans, including Auto-Protect scans, check
for viruses, Trojan horses, worms, and all categories of security risks.
See “Using Auto-Protect” on page 43.
See “Initiating manual scans” on page 52.
The Symantec™ Security Response Web site provides the latest information
about threats and security risks. The Web site also contains extensive reference
information, such as white papers and detailed information about viruses and
security risks.
Figure 1-1 shows information about a hack tool and how Symantec Security
Response suggests that you handle it.

16 Introducing Symantec AntiVirus
How Symantec AntiVirus responds to viruses and security risks
Figure 1-1 Symantec Security Response security risk description
See “Accessing the Symantec Security Response Web site” on page 38.
How Symantec AntiVirus responds to viruses and
security risks
Symantec AntiVirus safeguards computers from viruses and security risks no
matter what the source. Computers are protected from viruses and security
risks that spread from hard drives and floppy disks, and others that travel
across networks. Computers are also protected from viruses and security risks
that spread through email attachments or some other means. For example, a
security risk may install itself on your computer without your knowledge when
you access the Internet.

17Introducing Symantec AntiVirus
How Symantec AntiVirus protects your computer
Files within compressed files are scanned and cleaned of viruses and security
risks. No separate programs or options changes are necessary for Internet-
borne viruses. Auto-Protect scans uncompressed program and document files
automatically as they are downloaded.
Symantec AntiVirus responds to files that are infected by viruses or by security
risks with first actions and second actions.
When a virus is detected during a scan, Symantec AntiVirus, by default,
attempts to clean the virus from the infected file and repair the effects of the
virus. If the file is cleaned, the virus is successfully and completely removed. If
for some reason Symantec AntiVirus cannot clean the file, Symantec AntiVirus
attempts the second action, moving the infected file to the Quarantine so that
the virus cannot spread.
When your virus protection is updated, Symantec AntiVirus automatically
checks to see if any files are stored in the Quarantine and gives you the option of
scanning them using the new protection information.
Note: Your administrator may choose to scan files in the Quarantine
automatically.
By default, for security risks, Symantec AntiVirus quarantines the infected files
and returns the system information that the security risk has changed to its
previous state. Some security risks cannot be completely removed without
causing another program on your computer, such as a Web browser, to fail. If
Symantec AntiVirus is not configured to handle the risk automatically, it
prompts you before it stops a process or restarts your computer. Alternatively,
you can configure Symantec AntiVirus to use the log only action for security
risks.
When Symantec AntiVirus discovers security risks, it also presents a link in the
scan window to Symantec Security Response, where you can learn more about
the security risk. Your system administrator may also send a customized
message.
How Symantec AntiVirus protects your computer
Virus infections can be avoided. Viruses that are quickly detected and removed
from your computer cannot spread to other files and cause damage. The effects
of viruses and security risks can be repaired. When a virus or a security risk is
detected, by default Symantec AntiVirus notifies you that one or more of your
files is affected. If you do not want to be notified, you or your administrator can
configure Symantec AntiVirus to handle the risk automatically.

18 Introducing Symantec AntiVirus
What keeps Symantec AntiVirus protection current
Symantec AntiVirus provides these types of protection:
■Auto-Protect: Constantly monitors activity on your computer by looking for
viruses and security risks when a file is executed or opened, and when
modifications have been made to a file, such as renaming, saving, moving,
or copying a file to and from folders.
■Signature-based scanning: Searches for residual virus signatures in
infected files, and for the signatures of security risks in infected files and
system information. This search is called a scan. Depending on how your
computer is managed, you and your company’s administrator can initiate
signature-based or pattern-based scans to systematically check the files on
your computer for viruses and security risks, such as adware or spyware.
Scans can be run on demand, scheduled to run unattended, or run
automatically at system startup.
■Advanced heuristics: Analyzes a program’s structure, its behavior, and
other attributes for virus-like characteristics. In many cases it can protect
against threats such as mass-mailing worms and macro viruses, if you
encounter them before updating your virus definitions. Advanced
heuristics looks for script-based threats in HTML, VBScript, and JavaScript
files.
What keeps Symantec AntiVirus protection current
Symantec engineers track reported outbreaks of computer viruses to identify
new viruses. They also track new security risks, such as adware and spyware.
After a virus or security risk is identified, a signature (information about the
virus or security risk) is stored in a definitions file, which contains the necessary
information to detect, eliminate, and repair the effects of the virus or security
risk. When Symantec AntiVirus scans for viruses and security risks, it is
searching for these types of signatures.
Symantec makes updated definitions available on an ongoing basis. Definitions
are updated daily on the Symantec Security Response Web site. New definitions
are made available at least weekly for delivery using LiveUpdate, and whenever
a destructive new virus appears.
When new viruses and security risks are so complex that issuing new definitions
files for them isn’t sufficient, Symantec engineers can update the AntiVirus
Engine with the latest detection and repair components. When necessary,
AntiVirus Engine updates are included with the definitions files.

19Introducing Symantec AntiVirus
What keeps Symantec AntiVirus protection current
About the role of Symantec Security Response
The strength behind Symantec AntiVirus is Symantec Security Response. The
increasing number of computer viruses and security risks requires great effort
to track, identify, and analyze, and to develop new technologies to protect your
computer.
Symantec Security Response researchers disassemble each virus and security
risk sample to discover its identifying features and behavior. With this
information, they develop definitions that Symantec products use to detect,
eliminate, and repair the effects of new viruses and security risks during scans.
Because of the speed at which new viruses spread, particularly over the Internet,
Symantec Security Response has developed automated software analysis tools.
With direct submissions over the Internet of infected files from your Central
Quarantine to Symantec Security Response, the time from discovery to analysis
to cure is shrinking from days to hours, and in the near future, to minutes.
Symantec Security Response researchers also research and produce
technologies to protect computers from security risks such as spyware, adware,
and hack tools.
Symantec Security Response maintains an encyclopedia that provides detailed
information about viruses and security risks. In necessary cases, they provide
information about removing or uninstalling the risk. The encyclopedia is
located on the Symantec Security Response Web site.
See “Accessing the Symantec Security Response Web site” on page 38.
How virus and security risk protection is updated
Your administrator determines how your virus and security risk definitions are
updated. You may not have to do anything to receive new definitions.
The LiveUpdate feature in Symantec AntiVirus can be set up by your
administrator to make sure that your virus and security risk protection remains
current. With LiveUpdate, Symantec AntiVirus connects automatically to a
special Web site, determines if your files need updating, downloads the proper
files, and installs them in the proper location.
See “Keeping virus and security risk protection current” on page 33.

20 Introducing Symantec AntiVirus
What keeps Symantec AntiVirus protection current