ESET NOD32 ANTIVIRUS POUR MS EXCHANGE User manual

ESET NOD32 Antivirus
for MS Exchange Server
Installation
w e p r o t e c t d i g i t a l w o r l d s

2
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REV.20071114-002
ESET NOD32 Antivirus for MS Exchange Server

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1. Introduction
ESET NOD32 Antivirus for MS Exchange Server is ESET
NOD32 Antivirus version designed for scanning e-mail
trac routed by the MS Exchange Servers.
The major dierences between the ESET NOD32 Anti-
virus 2.7 and the ESET NOD32 Antivirus for MS Exchange
Server include a module XMON and the absence of IMON
and EMON modules.
This document describes the XMON module. Before
reading this document, please read the ESET NOD32 Anti-
virus 2.7 user guide rst.
As of version 2.71, the XMON module provides antivi-
rus protection for MS Exchange Server in two avors – a
32-bit for MS Exchange Server 5.5 SP3 and higher, 2000
SP 1 and higher and 2003 (xmon.dll), and a 64-bit for MS
Exchange Server 2007 (xmon64.dll).
The XMON module checks the MS Exchange Server e-
mail communication via its antivirus interface VSAPI or
external Control Center scanning core.
2. Installation
If you are running any previous version of the ESET
NOD32 Antivirus for Exchange Server, the new one can be
installed over (if it is version 2.0 or higher).
The installation wizard will help you to install the
NOD32 for MS Exchange Server. It displays the following
dialog:
If you want to install XMON, check the Activate an-
tivirus protection for MS Exchange Server (XMON) chec-
kbox. To activate the XMON service, you need the license
le provided by the provider or distributor upon purchase
of the program.
The license le is entered in the next step. If your Li-
cense le is valid, click Add and list the license le.
This screen is present in all installation scenarios.
Additional Activation of XMON:
If you have not activated the antivirus protection for
MS Exchange server, you can do it additionally by adding
the license le in the License manager. For License mana-
ger click on ESET NOD32 Antivirus system tools in the ESET
NOD32 Antivirus Control Center and choose ESET NOD32
Antivirus system setup/ setup. After adding the license
le, XMON will be activated.
ESET NOD32 Antivirus for MS Exchange Server

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3. XMON
The Main Window
To open the XMON main window, click on the XMON
icon in the Control Center window. If the XMON is displa-
yed in grey color, the MS Exchange Server is not present
on the local computer or the MS Exchange server version
is not supported by XMON. XMON is displayed in grey co-
lor also if the XMON module is not activated (it is not set,
or the license le has expired). In these cases XMON can-
not scan e-mails. If the XMON is displayed in red color; the
XMON module is not active. To activate the XMON, check
the Activate Control checkbox in the main window.
The main XMON window shows the number of scan-
ned, infected and cleaned les (a le is each e-mail mess-
age and its attachments).The main window also displays
MS Exchange version running on the local server and the
virus signature database version (with the date of the last
update in the parentheses).
• Active control – check box for XMON activation.
To activate the XMON, mark the check box. To disable it,
uncheck it. Before XMON deactivation you will be reques-
ted to conrm its shutdown.
• Settings – enables you to alter the default XMON
settings
• Run NOD32 – activates the NOD32 on−demand
scanner
Before XMON deactivation you will be requested to
conrm its shutdown. If you really want to turn o XMON,
press Yes.
Note: MS Exchange Server communicates with the antivirus scan
using the system database registry which is being checked
in approximately one minute intervals Turning XMON on and
o as well as any change in the settings will take about a
minute to take eect
SETTINGS
The left part of the XMON Settings window shows
eight possible setting areas of XMON. The setting para-
meters in each setting area are shown in the right part
of the window.
The MS Exchange server checks the settings of the
XMON module each minute, so the new XMON settings
come into eect after a few seconds.
Scanner
The Scanner page shows the following properties:
• Background scanning – if checked, all the mess-
ages are scanned in the background. XMON keeps track of
what messages it scanned and the version of virus data-
base it used. If you are opening a message not scanned
by the most current virus database, XMON scans it before
opening it in your e-mail client. The background testing
means that XMON keeps scanning all the messages from
ESET NOD32 Antivirus for MS Exchange Server

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the Exchange server, so when you are about to open the
message, it has already been scanned. Background scan-
ning can inuence system load (scanning is done by each
virus signature database update).When scanning the sto-
re database in the day mode, the system might be slowed
down. In this case we recommend using scheduled scan-
ning outside working hours. By scheduled scanning, the
option has to be disabled.
• Proactive scanning – new inbound messages are
scanned in the order they are received. If this checkbox is
marked and a user opens a message that has not been
scanned yet, this message is scanned before the other
messages waiting in the scanning queue.
• Scan plain text message bodies – enables scan-
ning plain text messages
• Scan RTF message bodies – enables scanning
RTF message bodies. The RTF message bodies may con-
tain macroviruses
• Scan transported messages – When checked,
XMON scans also messages that are not stored on the lo-
cal MS Exchange server and are delivered to other e-mail
servers through the local Exchange server. The MS Ex-
change Server can be set as a gateway and used just to
deliver messages to the other e-mail servers. If Scan of
the transported messages is turned on, XMON scans also
these messages.
• Repeat scanning button – By clicking the Repeat
scanning button all the messages stored on the local MS
Exchange server are scanned again. Upon each virus data-
base update the XMON scans all the messages stored on
the Exchange server again as well. It is useful for example
after changing the rules.
• Default button – By clicking the Default button,
all the properties on Scanner page are set to default (fac-
tory settings).
When clicking the Default button, a conrmation
window will allow you to conrm or reject your selection.
By clickingYes, you will activate the default settings.
Detection
The Detection page contains the settings of detecti-
on methods.
The ThreatSense Scanning Engine options section al-
lows you to set the methods for detection of inltrations
used in XMON module. For highest security level check all
of them.
• Signatures – when checked, XMON uses the sig-
nature based inltration detection
• Heuristics – when checked, XMON uses heuristic
method based inltration detection (analysis of le con-
tent)
• Advanced Heuristics – when checked, XMON
uses Advanced Heuristics based inltration detection.
Advanced Heuristics is a new unique set of ESET NOD32
Antivirus system, among others capable of eective dete-
cting internet worms.
• Adware/Spyware/Riskware – when checked,
XMON detects also this kind of bothering malware
• Potentially unsafe applications - this classica-
tion is used for commercial legitimate software. It inclu-
des programs such as remote access tools, password-crac-
king applications, and keyloggers (programs recording all
keystrokes).
• Potentially unwanted applications - Potenti-
ally unwanted applications are not necessarily intended
ESET NOD32 Antivirus for MS Exchange Server

6
to be malicious, but they may aect the performance of
your computer. Such applications usually require consent
for installation. If they are present on your computer, your
system behaves dierently (when compared to the state
before their installation).
In the Target section check the types of attachments
to be scanned (Archives, Self-extracting archives, Run-
time archives). When scanning archives the scanning
procedure is more time consuming, because the archive
must be opened for scanning.
Extensions
The Extensions page enables you to set which le typ-
es should be included in virus scanning.
• Scan all les – marking this check box, XMON will
scan all les types found in message attachments.The le
types list will show le types excluded from scanning in-
stead of les included in scanning.
• Add – enables you to add a new le extension to
the le extension list. It displays Add new extension win-
dow. To add a new extension use alphanumerical charac-
ters and wildcards such as“?”(represents random charac-
ter) and“*”(represents random order of characters).
• Remove – removes the selected le extension
from the list
• Default – restores the default extension list set-
ting
• Scan extension−less les - adds scanning les
without extensions
Add a new extension (you can also use wildcards “?”
and“*”) and click OK.
Actions
The Actions page lets you select what actions should
be taken upon virus detection. When scan archives option
in Detection in the Targets section is activated, this pane
contains separate settings for archives and les. The type
can be chosen in the pull-down menu.
The When virus is found settings let you select what
action should be taken upon virus detection.
• Clean – XMON attempts to clean the virus from
the infected le.When the attempt fails, the action selec-
ted in theWhen virus cannot be cleaned settings is execu-
ted.
• No action, mark as infected – when selected
the Exchange server is notied about the infection and
the user cannot open the infected message attachment.
• Rename attachment/ delete message –
XMON changes the attachment extension, so that it can-
not be opened or run. If the message body contains a vi-
rus, the message will be deleted.
• Delete – XMON deletes the infected message or
the attachment if only the attachment is infected. The
ESET NOD32 Antivirus for MS Exchange Server

7
deletion process can be adjusted in the Deleting setting
page.
• Quarantine – when checked, the infected mess-
ages will be stored in Quarantine, where it is harmless.
Messages stored in Quarantine can be analyzed and cle-
aned later using a newer virus signature database.
When virus cannot be cleaned setting is executed, if
Clean option in previous menu is set. Some of the infe-
ctions cannot be cleaned, because the XMON does not
have a cleaning procedure for them, or because they do
not contain any useful content except virus (currently the
most common case). The When virus cannot be cleaned
settings lets you select what action should be taken when
attempt to clean an infected message fails. (No action,
Mark as infected, Rename attachment/ Delete messa-
ge, Delete, Quarantine)
Rules
The Rules settings let you select detailed rules for
handling le types. If there is more than one rule for a sin-
gle le type, the rst rule in the list is applied.
Rules are prior to extensions set in Extensions set-
tings, meaning that the each le is at rst compared to
existing rules. It will be scanned only if no rule is applied
(or if the respective rule says that it has to be scanned).
The number of rules applied is displayed in the Number
column.
• Add– enables you to add a new rule
• Modify– modies the selected rule
• Remove– removes the selected rule
• Move up – moves up the selected rule and incre-
ases its priority
• Move down – moves down the selected rule and
decreases its priority
Adding a new rule will open a wizard, which guides
you through the process.
• Mailbox – the rule applies to the name of a mail-
box
• Sender of message – the rule applies to a mess-
age sent by the selected sender.
• Subject of message – the rule applies to a mess-
age with the selected subject line
• File name mask – File name mask enables you to
select a certain le selection
• File size – File size enables you to select les from
certain size
In the strings in the Sender of message and Subject
of message it is enough to ll in only a part of a text (if
the Match whole words only option is not checked); capi-
tal letters are not dierentiated (if the option Dierenti-
ate capital letters is not checked). When using other than
alphanumerical characters, use parentheses and quotes.
You can also create conditions using logical operators
AND, OR, NOT.
ESET NOD32 Antivirus for MS Exchange Server

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File name mask enables you to select a certain le se-
lection using a mask created from alphanumerical chara-
cters and wildcards“?”and“*”, e.g.“*.VBS”.The rule is ap-
plied to les matching this mask. To use more than one
mask, separate them by a semicolon.
File size limit enables you to select certain size of at-
tachments. The rule will be applied to all attachments
with the size exceeding the dened value.
Rule applies to a name of a mailbox and all other pro-
cedures connected with its usage are the same as with the
other rules.
The Action section lets you select what actions should
be taken with les matching the above mentioned search
criteria.
• Scan for viruses as – XMON will scan for viruses
in selected le
• No action – XMON declares the message to be cle-
an
• Rename attachment/ delete message –
XMON alters the le extension so that it cannot be ope-
ned or run
• Delete – XMON deletes the selected message
• Mark as infected – XMON marks the selected
message as infected
• Quarantine –The selected message will be stored
in Quarantine
Finally, add the rule name and description to be saved
in the Exchange server log when the rule is applied.
Deleting
The Deleting page lets you select what action should
be made when a message or attached le is selected for
deletion.
ESET NOD32 Antivirus for MS Exchange Server

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When deleting message settings lets you select what
actions should be taken when the whole message is mar-
ked for deletion.
• Delete message body – XMON deletes the body
of the infected message. The recipient will receive the
empty message and also non−infected attachments
• Overwrite message body with virus protocol
– XMON overwrites the message body with a virus proto-
col or a rule description.
• Delete whole message – XMON deletes the
whole message including all attachments
When deleting attachments settings lets you select
what action should be taken when a message is marked
for deletion.
• Truncate le to zero size – XMON truncates the
attachment to zero size and lets the recipient see the at-
tachment le name and type.
• Replace le with virus protocol – XMON repla-
ces the infected le with a virus protocol or rule descripti-
on
• Delete whole message – XMON deletes the
whole message along with all its attachments
Note: If you can not open the Deleting selection it is displayed in
grey it is not supported by your MS Exchange Server version
Performance
The Performance page lets you select performance
parameters for XMON.
• Use NOD32 Control Center scanner - Unlike
all the previous versions that would explicitly use the in-
ternal scanning core for antivirus scanning, version 2.71
brings an option to utilize external Control Center scan-
ning core as well. With 32-bit versions of MS Exchange
Server this feature is optional and it is possible to select
it in the Performance section of the XMON setup.With the
64-bit version of MS Exchange Server it is only possible to
utilize the external Control Center scanning core. Therefo-
re this option is automatically selected and grayed out.
• Number of threads – this parameter lets you
select how many threads should be used for virus scan-
ning. More threads on multiprocessor machines can in-
crease the scanning rate. MS Exchange server provider re-
commends using the following formula to determine the
number of threads used: Number of physical processors
times 2 plus 1 = number of threads used.
• Time limit (for Exchange 5.5) – sets the time in-
terval for running the virus scanner
• Time limit (for Exchange 2000 and higher) – a
time limit for scanning an individual le
• Folder to store temporary les - For the best
performance, we recommend that you congure XMON
to store temporary les on a physical drive other than
the one with the Exchange store. If no folder is specied,
XMON will create temporary les in the system tempora-
ry folder.
Background scan scope option
MS Exchange Server 2007 provides a way to actively
aect antivirus scanning in the background.Therefore the
64-bit XMON module version oers an option to congu-
re the progress and scope of background scanning. Howe-
ver, this option is not available in 32-bit versions of MS
Exchange Server and the XMON module; therefore the ap-
propriate controls are inactive and grayed out
Selecting Scan only messages with attachment will
limit the background scanning scope only to messages
with an attachment. This will also decrease the overall
server load while scanning in the background.
Please note that not all infected messages necessari-
ly come with an attachment. However, this will, not de-
crease protection of the messages in the MS Exchange
ESET NOD32 Antivirus for MS Exchange Server

10
Server store, as messages are also checked when acces-
sed by the user.
Another way to reduce the overall system load is pro-
vided by the Scan level option. When enabled, only mess-
ages from the specied time interval determined by the
date of message receipt will be scanned on the backg-
round. It is possible to choose between scanning of all
messages regardless the date of receipt, messages rece-
ived within the last year, 6 months, 3 months, one month
or week. Choosing the appropriate background scan level
will enable administrators of MS Exchange Server 2007 to
tune up the system performance to their needs. Also in
this case messages not falling into the specied time in-
terval are not left without antivirus protection, yet they
are checked when accessed by the user.
Given the high detection eciency provided by the
ESET NOD32 Antivirus for MS Exchange Server scanning
core, we recommend the following: After the initial instal-
lation of ESET NOD32 Antivirus for MS Exchange Server, let
the scanning run in the background with no restrictions.
After certain time (1 - 2 days) tune up background scan-
ning according to the estimated frequency of users acces-
sing older messages and the volume of messages received
within the specied time interval.
Protocol
The Protocol settings page lets you select how the vi-
rus scanning protocol/log should be assembled. More de-
tailed protocol can contains more information, but it can
slow down the server.
• Log all les – when checked, all scanned les are
listed in the scanning log, including non−infected les
• Synchronous logging – when checked, all the
log entries are immediately written into the log le wi-
thout storing them in the log cache
• Scope – This setting lets you select what the sco-
pe of logging activities. The more detailed the scope, the
more activities are written into the log le
• Log server version – when checked, XMON wri-
tes the server version into the log le
•Log license – when checked, XMON writes the
XMON license into the log le
• Log rules – when checked, XMON writes the list of
currently enabled rules into the log le (only in detailed
one)
4.Recommended settings:
• Excluding Exchange les from resident
protection scanning
XMON scans e-mail messages stored in the MS Ex-
change Server storage. This storage is saved on the ser-
ver le system as a single le and using non-standard set-
tings in AMON (on-access scanner) while running on the
same server, might lead to a collision between XMON and
AMON. To avoid the collision make sure that the AMON
module is not set to scan .EDB, .TMP and .EML le typ-
es. By default, the mentioned extensions are excluded
from scanning. It is also recommended to exclude from
scanning directories containing following les and di-
rectories:
%ProgramFiles%\Exchsrvr\MDBData\
%ProgramFiles%\Exchsrvr\Mtadata\
%ProgramFiles%\Exchsrvr\Server_Name.log
%ProgramFiles%\Exchsrvr\Mailroot
%ProgramFiles%\Exchsrvr\Srsdata
%SystemRoot%\System32\Inetsrv
%ProgramFiles%\Exchsrvr\IMCData
ESET NOD32 Antivirus for MS Exchange Server

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To exclude these le and directories in AMON modu-
le, follow these steps:
• Click on the Setup button in AMON module
• Click on the Exclusions tab and then on the Add
button
• In displayed window click on the Folder or File but-
ton (depends on what you want to exclude) and browse
for required items.
• Setting the background scanning in the
scheduled time
Scheduled background scanning can be congured
via a special task in the Scheduler/Planner. When sche-
duling a Background scanning task you can set the launch
time, the number of repetitions as well as other parame-
ters available in the Scheduler/Planner.
The Background scan task requires one mandato-
ry parameter that species the timeout for background
scanning. The interval is in hours, within the range from
1 to 32.
After the task has been scheduled, it will appear in
the list of scheduled tasks and as with the other tasks,
you can modify its parameters, delete or temporary de-
activate the task. If the task is run at the specied time,
XMON will allow MS Exchange Server to run background
scanning. After the specied timeout has elapsed, XMON
will stop MS Exchange Server from scanning in the back-
ground. In this interval, it is up to MS Exchange Server to
decide whether a background scan will run or not, based
on various factors, such as the current system load, the
number of active users, etc.
• Performance monitoring
With transition to 64-bit systems, the XMON modu-
le has started to support an external Control Center scan-
ning core. This extension applies also to 32-bit version,
where the option to utilize the internal scanning core re-
mains. Both approaches to way of utilizing the scanning
core have their pros and cons, depending on the systems
where they are installed. One of the factors that adminis-
trators will consider when choosing between these ap-
proaches is the speed of antivirus scanning. Therefore, as
of version 2.71 the XMON module can calculate the cur-
rent performance and report it in the module event log.
To log this information, the logging scope must be set to
Detailed.
XMON will log performance information such as
number of scanned objects (messages and attachments),
scan time in seconds, scanning speed in kB per seconds,
etc. in 5-minute intervals.

12
Likewise logging results, the monitoring results are
also written in a 5-minute interval. They are not accumu-
lated and each benchmark is performed from scratch once
the results have been logged.
• Rename infected les
It is not recommended to set the default settings for
infected les to “rename” while using the option to scan
all les (default settings). All infected les with .EXE or
.DOC extension would after renaming have the extensi-
ons .VEXE or VDOC, so the Server in MS Windows would
not be executed after clicking, but the antivirus system at
each scan would recognize the les by their content and
rename them further (.VVEXE or .VVDOC, etc.). All messa-
ges are scanned in the MS Exchange Server storage upon
each virus signature database update, the consequent re-
naming would slow down your computer. It is recommen-
ded to exclude from testing at least les with . VV* exten-
sions (not .V extensions – this would include also Visual
Basic Script.)