Real-time scanning constantly runs in the background, scanning all files as the system accesses them. The following features can be configured as follows:
To enable Real-time Scan, select the Enable Real-time scan check box.
Trend Micro strongly recommends keeping real-time scanning enabled.
Real-time scan can detect viruses for incoming files and outgoing files.
Incoming files: Scan files when they are closed on the Trend Micro NAS Security™ system.
Outgoing files: Scan files when they are opened on the Trend Micro NAS Security™ system.
You can scan incoming, or outgoing files by selecting the appropriate check box(es). Click Save to apply any changes.
There are three main options for this feature:
All file types: This option scans all files.
IntelliScan:
Use "true file type" identification: This option scans a
file’s
Specified file extensions: This restricts scanning to selected file extensions. You can restrict scanning based on recommended extensions, selected extensions, or other extensions. These three options can be enabled either individually or in combination with each other:
Scan Trend Micro recommended extensions: This option takes advantage of the constantly updated extensions list embedded within the virus pattern file.
Scan selected extensions: You can specify extensions from a list of extensions. To do so, do the following:
Select the extension from the left list box.
Click Add to add the extension to the File types to scan list
To remove previously excluded extensions, do the following:
Select the extension from the right list box. See above for multiple selection instructions.
Click Remove to clear the extension from the File types to scan list.
Other extensions: Type custom file extensions in this text box. Use colons (:) or semicolons (;) to separate entries.
To enable compressed file scanning, do the following:
Select Scan compressed files.
Specify the number of compression layers to scan. The permitted values are from 1 to 20.
Specify the maximum file size that is extracted for scanning. The minimum value you can set is 1-MB, while the maximum value is 2000-MB.
The user may experience errors when storing files on the Trend Micro NAS Security™ device if a large number of compression layers to scan is specified or if the maximum file size specified is large.
To configure:
Decide whether to back up files before performing an action. To create copies of the files, select Back up file containing security risk before action is taken.
Select an appropriate action from the following:
Use ActiveAction: ActiveAction is a set of preconfigured scan actions for viruses and other types of potential security risks. These actions are updated in every new pattern file update from Trend Micro. If you are not familiar with scanning actions or if you are not sure which action is suitable for a certain type of security risk, Trend Micro recommends selecting ActiveAction.
Use customized action: Trend Micro NAS Security™ can perform the following actions on detected malware.
Clean: Remove malware code from files in which it is detected
Quarantine: Move files in which a security risk is detected to a file and location specified by the NAS vendor.
Rename: Replace the file's extension with "VIR"
Delete: Remove files in which a security risk is detected
Pass: Record files in which a security risk is detected in the virus log, but take no action (this action is not recommended)
For viruses and other security risks you may also specify a secondary action, in the event that the clean action fails. Select the action in the drop-down list in the Second Action column. The secondary action is performed only if the first action performed is not successful.
Use the same action for all types: This option operates as described for the previous option above, except all security risks are treated the same and cannot be customized by type of risk.
The following table shows the default action for each type of threat when customized scan action is selected.
Threat Type |
Default Action |
Secondary Action |
Joke |
quarantine |
none |
Trojan |
quarantine |
none |
Virus |
clean |
quarantine |
Test Virus |
pass |
none |
Spyware/Grayware |
quarantine |
none |
Packer |
clean |
quarantine |
Other |
clean |
quarantine |
Trojans and certain kinds of worms cannot be cleaned. These must be quarantined or deleted.
These settings can be configured on the Real-Time Scan screen. On the left menu, click Scan Options > Real-Time Scan.