All about NASL Files

The NASL file type is primarily associated with Nessus.

NASL	File extension: NASL
	File type:	script file

What is a NASL file?

NASL files mostly belong to Nessus. The NASL file is a Nessus Attack Scripting Language file that contains instructions for performing vulnerability scans. It is a plain text script used by the Nessus engine to run tests, execute functions, and check for weaknesses in a network or system.
Key details summarized by FilExt.com include:

Security tests coded as functions

C-like syntax with conditionals and routines

Custom scan rules for automated vulnerability assessment

Editability with any text editor

FilExt.com tip: These files work inside the Nessus scanning tool from Tenable. For more technical details, visit Tenable.

How to open a NASL file

You need a suitable software like Nessus to open a NASL 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 NASL file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a NASL file directly in the browser:. Just drag the file onto this browser window and drop it.

Online NASL Text Viewer

Choose your .nasl file to view

or drag and drop it here

Online File Viewer

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How to extract texts from NASL files or capture a screenshot to PDF, JPG, DOCX, TXT, ...

You can extract texts from NASL file or capture a preview screenshot using our online NASL file viewer:

Just click the "Choose your .nasl file to view" button on this page.
After your file is opened in browser,
click "Save as..." in the menu.
Then choose the file format (e.g. JPG, PDF, DOCX, TXT, ...) you want.
Download the converted file.

Programs that open and convert NASL files:

Nessus
See the previous paragraphs to learn more about the main application. NASL files are often referred to as Nessus developers because this type of file is primarily created or used by this software.
Nessus Attack Scripting Language (Key File) by Tenable Network Security
NASL is a scripting language designed for the Nessus security scanner. Its aim is to allow anyone to write a test for a given security hole in a few minutes, to allow people to share their tests without having to worry about their operating system, and to guarantee everyone that a NASL script can not do anything nasty except performing a given security test against a given target.

Technical Data for NASL File Extension

File classification:

Developer

Related files:

nse, py, sh, nbin, txt, nessus, nbe, nsr, cfg

a nasl script file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with NASL files

Associate the NASL file extension with the correct application.
Update your software that should actually open script files. Because only the current version supports the latest NASL file format. Search, therefore, e.g. on the manufacturer website after an available Nessus update.
To make sure that your NASL file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .NASL file online - secure, fast, and no downloads needed.