Threat Description

Virus: ​W32/Bursted


Category: Malware
Type: Virus
Platform: W32
Aliases: Virus:​W32/Bursted, Virus.acad.bursted, Trojan.acad.bursted.u


A malicious program that secretly integrates itself into program or data files. It spreads by integrating itself into more files each time the host program is run.


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.

Technical Details

Bursted is a virus written for AutoCAD's embedded scripting language, AutoLISP. It replicates in a separate file, "acad.lsp" that is automatically executed by AutoCAD. It does not affect the actual drawing files. The virus arrives in a file "acad.lsp" that is located in the same directory as the AutoCAD drawing files. When the drawing is opened, AutoCAD will automatically load and execute the contents of the "acad.lsp". The virus copies itself to AutoCAD's Support directory as "acadapp.lsp". The virus also appends the load command to the "acad.lsp" in the Support directory, so the virus will be executed every time when AutoCAD is started. After that the virus will copy itself to every directory as "acad.lsp" from where the user opens AutoCAD drawings.


The virus hooks three AutoCAD internal commands - EXPLODE, XREF and XBIND - effectively disabling them. Additionally the virus will change the existing BURST command so that it will display the following message:


Detection in F-Secure Anti-Virus was published on December 4th, 2003 in update:
Database: 2003-12-04_05


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