Burning Question: What are MAXScript Viruses and How do I get Rid of Them?

Burning Question: What are MAXScript Viruses and How do I get Rid of Them?
Tutorial, Burning Questions Dec 07, 2018 at 09:28 AM

There are few things more unsettling than finding out that your computer has been infected with malware or a virus. CRP, ADSL, and ALC are MAXScript viruses that 3ds Max users can get from opening stock models and other people’s files. Don’t worry, there are some free tools that you can download to clean your computer of these nasty bugs.

What are these viruses and how do get them

These viruses (ALC, CRP, and ADSL) most often come from infected scene files from non-Autodesk 3D model download sites or online sharing services. Your computer is infected when you load them into 3ds Max and your anti-virus software will probably not pick these up. These have been around for about a year so they are not new, but there are some new removal tools available, hence, we're bringing this up now.

What damage do they do?

They can corrupt your files, cause 3ds Max to crash, cause Script Controller errors, cause scene lights to stop working, and cause undo to stop working.


Free MAXScript Virus Removal Tools

Security Tools for Autodesk® 3ds Max® 2019-2018-2017-2016-2015

This Security Tools script was included with 3ds Max 2019.2 but is now available for download for older versions of Max. It's available at the Autodesk App Store:

3ds Max Security Tools protects you from CRP, ADSL and ALC 3rd party scripts, which can corrupt the 3ds Max environment, cause data loss and instability, as well as spread to other systems.

The 3ds Max Security Tools provides immunity against CRP, ADSL, and ALC 3rd party scripts, and is the most effective way to detect and remove them from 3ds Max startup scripts and scene files.


  • Detects CRP, ADSL, and ALC in 3ds Max startup scripts, and keeps them clean of these corruptions;
  • Detects CRP, ADSL, and ALC in 3ds Max in scene files no matter how they are loaded into 3ds Max (merged, xrefed, drag and dropped, loaded through scripted commands, etc), and cleans them of these corruptions;
  • Ensures that 3ds Max will not save CRP, ADSL or ALC corrupted scenes;
  • Asks for user confirmation before cleaning startup scripts and scene data;
  • Works in quiet and other non-interactive usage scenarios of 3ds Max, such as command line rendering and batch scripting;
  • Logs all its actions to the system log (Max.log);
  • Does not prevent the user from fully using 3ds Max even when choosing not to clean the startup scripts or scene data.
  • The 3ds Max Security Tools is a free plugin available to all users of 3ds Max. We strongly recommend that you install the 3ds Max Security Tools on all your systems running 3ds Max.

Download the script | Learn more

Sini software Forensic 1.11.2

This is a scene checker that now includes tools to remove MAXScript Viruses. This app is also available from the Autodesk App store for 3ds Max 2015-2019 and supports V-Ray, Corona, Arnold, Maxwell, Octane, finalRender, Iray, and Mental Ray. Here are the details:

This app will help you resolve issues you might experience when working on a scene, such as empty objects crashing Autodesk® 3ds Max®, drawn-out simulation times, CAD blocks and linked composites clogging up scenes, 3rd-party plugin mismatches e.g. Vray planes not rendering with Arnold and Corona lights, and so on.

Features of this app include:

  • Search and remove malicious MAXScripts, ADL, CRP, ADSL.
  • Fast interrogation of 3d scenes.
  • Removal CAD and Revit blocks.
  • Clean-up and fix issues.
  • Unify polygon and mesh normals.
  • Checks for missing Modifiers.
  • Reveals the last person to save file.​

How to Avoid getting Viruses and Malicious Scripts

These are common sense, but someone out there may need this advice!

  1. In general, avoid visiting torrent sites and downloading from sites that are sketchy, and stick with app developers and well-known stock media sites whenever possible. TurboSquid, for example, has protection on their site to protect from indemnification.
  2. Always wear your "computer condom". That's what my old boss would call anti-virus software. And keep your virus protection up to date! Although these viruses will probably not show up on your virus scanning software, there are new malicious malware, spyware, viruses, and trojan horses out there all of the time. 
  3. Be vigilant and check your computer immediately for a virus or malware if you notice anything strange happening in 3ds Max. 

Posted by Michele Yamazaki