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.
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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: