All about YAR Files

The YAR file type is primarily associated with ActivInspire.

YAR	File extension: YAR
	File type:	compressed archive

What is a YAR file?

YAR files mostly belong to ActivInspire. YAR files are not a single‐purpose format. In some cases, they are Smart Notebook files used by interactive whiteboards. This type is a zipped archive (using the ZIP format) that stores whiteboard content and lessons for Promethean ActivInspire. You can open these files with ActivInspire software.
In other cases, YAR files contain YARA rules. These are plain text files that list patterns and conditions to help in malware identification. Cybersecurity professionals use these rule files with a YARA tool. More details are available at VirusTotal or at GitHub YARA rules.
Key details:

Whiteboard Archive: This version is a compressed file used on interactive boards and holds proprietary lesson data.

Rule Definition: This version is a text file containing structured rules to flag malware patterns.

FilExt.com note: It is important to use the correct tool for the version you have. Changing the extension to .zip may reveal files inside a whiteboard document, while a simple text editor will display a YARA rule set.

How do you open YAR files?

You need a suitable software like ActivInspire to open a YAR file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your YAR file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a YAR file directly in the browser:. Just drag the file onto this browser window and drop it.

Online YAR Text Viewer

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Programs that open and convert YAR files:

ActivInspire
See the previous paragraphs to learn more about the main application. YAR files are often referred to as ActivInspire compresseds because this type of file is primarily created or used by this software.
Castles & Catapults (Game File) by Infogrames Entertainment SA
Castles & Catapults combines the turn-based planning and strategy of a board game with the action of a real-time computer game. Clicking on the official game site redirects you to the Atari site. Infogrames owns the majority of shares in Atari. This file format is classified as Game.
YAR
The YAR archive specification is under development as of mid-2007. This file format is classified as Archive. Related links: Comparing .YAR to Other Archive Formats

YAR file format:

If you know the file format, you can also find out how to open or edit the file. The first characters in a file identify the file format, for example, HTML files start with the bytes <html>. File extension, signature and file format must match; otherwise errors will occur when the file is opened. If there are problems opening a file, you must first determine the file format used. Our evaluation of the YAR files is as follows:

The YAR file type is a very commonly used file extension and includes various formats for various programs. However, the following two file formats are common:

55% of all YAR files use ZIP compression, so several files are compressed and saved in one YAR file. YAR files contain from 8 to 200 compressed files. Customary file names are Whiteboard_1.png, documentstructure.xml and \pages\. You can see the included files and images by renaming the file extension to .zip and then double-clicking it. A typical file size is 1 MB. The files contain the following words: documentstructure.xml. Files like these have the following tags: board, star, lesson, year, ezercizzji, perfett, number, notes, vella and week.
15% of all YAR files use the same file format, which can be identified by the letters "rule " at the beginning. These files are text files and can therefore be read using a text editor. The files are on average 1 KB in size and range from 330 bytes to 9 KB. The files contain the following words: rule, meta, author, description, date and strings. Such files sometimes refer to auto.

All the rest of the YAR files (30%) have different formats, frequently e.g. import. They are often associated with passwords, kiwi, rules, rule, acsc, ransomexx, malware, adpass, agent, hack, hunt, msil, team or tool. If you want to find out which format your YAR file belongs to, just click on the button "Choose your .yar file to analyze".

Technical Data for YAR File Extension

File classification:

Compressed

Related files:

yara, nbk, ymt, zip, yarc3, ydd, idl, 7z, md, jar, txt, pdf, ioc, exe, yap, ypcl, ykey, rar

Mime type:

text/x-yara

a yar compressed archive is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with YAR files

Associate the YAR file extension with the correct application.
Update your software that should actually open compressed archives. Because only the current version supports the latest YAR file format. Search, therefore, e.g. on the manufacturer website after an available ActivInspire update.
To make sure that your YAR file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
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