ThreatSense parameters

ThreatSense is a technology that employs a variety of complex methods for threat detection. It is proactive, protecting your system during the early spread of a new threat. This technology integrates code analysis, code emulation, generic signatures, and virus signatures, significantly enhancing system security. The scanning engine can simultaneously check multiple data streams, maximizing efficiency and detection rates. Additionally, ThreatSense technology can successfully eliminate rootkits.

For details about automatic startup file check, see Startup scan.

You will find several ESET Server Security modules utilizing ThreatSense technology. Various security scenarios may require different configurations. Therefore, you can configure ThreatSense individually for the following protection modules:

•Hyper-V scan

•OneDrive scan

•Real-time file system protection

•Device scan

•Web access protection

The ThreatSense parameters are finely tuned for each module; altering them can impact system performance. For instance, adjusting the settings always to scan runtime packers or enabling Advanced heuristics in the Real-time File System Protection module may slow the system down, as these methods typically scan only newly created files. We recommend keeping the default ThreatSense parameters unchanged for all modules except for the Computer Scan.

Objects to scan

You can specify which computer components and files will be scanned using the ThreatSense technology.

Operating memory

Scans for threats that attack the operating memory of the system.

Boot sectors/UEFI

Scans boot sectors for the presence of viruses in the MBR (Master Boot Record). In case of a Hyper-V Virtual Machine, its disk MBR is scanned in read - only mode.

WMI database

Scans whole WMI database, searching for references to infected files or malware embedded as data.

System registry

Scans system registry, all keys and subkeys, searching for references to infected files or malware embedded as data.

Email files

The program supports the following extensions: DBX (Outlook Express) and EML.

Archives

The program supports the following extensions: ARJ, BZ2, CAB, CHM, DBX, GZIP, ISO/BIN/NRG, LHA, MIME, NSIS, RAR, SIS, TAR, TNEF, UUE, WISE, ZIP, ACE, and many others.

Self-extracting archives

Self-extracting archives (SFX) are archives needing no specialized programs – archives – to decompress themselves.

Runtime packers

After being executed, runtime packers (unlike standard archive types) decompress in memory. In addition to standard static packers (UPX, yoda, ASPack, FSG, etc.), the scanner is able to recognize several additional types of packers through the use of code emulation.

Scan options

Select the methods used when scanning the system for infiltrations. The following options are available:

Heuristics

A heuristic is an algorithm that analyzes the (malicious) activity of programs. The main advantage of this technology is the ability to identify malicious software which did not exist, or was not known by the previous detection engine.

Advanced heuristics/DNA signatures

Advanced heuristics consist of a unique heuristic algorithm developed by ESET, optimized for detecting computer worms and Trojan horses and written in high-level programming languages. The use of advanced heuristics greatly increases the threat detection capabilities of ESET products. Signatures can reliably detect and identify viruses. Utilizing the automatic update system, new signatures are available within a few hours of a threat discovery. The disadvantage of signatures is that they only detect viruses they know (or slightly modified versions of these viruses).

Cleaning

The cleaning settings determine the behavior of the scanner while cleaning infected files. Real-time protection and other protection modules have the following remediation (i.e. cleaning) levels.

Always remedy detection

Attempt to remediate the detection while cleaning objects without any user intervention. System files are an exception. Such objects are left in their original location if the detection cannot be remediated.

Remedy detection if safe, keep otherwise

Attempt to remediate the detection while cleaning objects without any user intervention. If a detection cannot be remediated for system files or archives (with clean and infected files), the reported object is kept in its original location.

Remedy detection if safe, ask otherwise

Attempt to remediate the detection while cleaning objects. In some cases, if ESET Server Security cannot perform automatic action, you will be prompted to choose an action (delete or ignore). This setting is recommended in most cases.

Always ask the end-user

No automatic action will be attempted by ESET Server Security. You will be prompted to choose an action.

Exclusions

An extension is the part of a filename delimited by a period. An extension defines the type and content of a file. This section of the ThreatSense parameter setup lets you define the types of files to exclude from scan.

Other

When configuring ThreatSense engine parameters setup for a On-demand computer scan, the following options in Other section are also available:

Scan alternate data streams (ADS)

Alternate data streams used by the NTFS file system are file and folder associations which are invisible to ordinary scanning techniques. Many infiltrations try to avoid detection by disguising themselves as alternate data streams.

Run background scans with low priority

Each scanning sequence consumes a certain amount of system resources. If you work with programs that place a high load on system resources, you can activate low priority background scanning and save resources for your applications.

Log all objects

If this option is selected, the log file will show all the scanned files, even those not infected.

Enable Smart optimization

With Smart Optimization enabled, the optimal settings are used to ensure the most efficient scanning level, while simultaneously maintaining the highest scanning speeds. The various protection modules scan intelligently, making use of different scanning methods and applying them to specific file types. If Smart Optimization is disabled, only the user-defined settings in the ThreatSense core of the specific modules are applied when performing a scan.

Preserve last access timestamp

Select this option to keep the original access time of scanned files instead of updating them (for example, for use with data backup systems).

Limits

The Limits section allows you to specify the maximum size of objects and levels of nested archives to be scanned:

Default object settings

Enable to use default settings (no limits). ESET Server Security will be ignoring your custom settings.

Maximum object size

Defines the maximum size of objects to be scanned. The given protection module will then scan only objects smaller than the size specified. This option should only be changed by advanced users who may have specific reasons for excluding larger objects from scanning. Default value: unlimited.

Maximum scan time for object (sec.)

Defines the maximum time value for scanning of an object. If a user-defined value has been entered here, the protection module will stop scanning an object when that time has elapsed, regardless of whether the scan has finished. Default value: unlimited.

Archive scan setup

To modify archive scan settings, deselect Default archive scan settings.

Archive nesting level

Specifies the maximum depth of archive scanning. Default value: 10. For objects detected by Mailbox transport protection, actual nesting level is +1 because archive attachment in an email is considered first level.

If you have nesting level set to 3, an archive file with nesting level 3 will only be scanned on a transport layer up to its actual level 2. Therefore, if you want to have archives scanned by Mailbox transport protection up to level 3, set the value for Archive nesting level to 4.

Maximum size of file in archive

This option allows you to specify the maximum file size for files contained in archives (when they are extracted) that are to be scanned. Default value: unlimited.

We do not recommend changing the default values; under normal circumstances, there should be no reason to modify them.

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