This is virus detection. Viruses are programs that self-replicate recursively, meaning that infected systems spread the virus to other systems, which then propagate the virus further. While many viruses contain a destructive payload, it's quite common for viruses to do nothing more than spread from one system to another.
Emsisoft - Trojan.ACAD.Bursted.N (B)
F-Secure - Trojan.ACAD.Bursted.N
Kaspersky - Virus.Acad.Bursted.a
Sophos - AL/Bursted-AJ
Microsoft - Virus:ALisp/Bursted.CC
6898 (2012-11-16)Updated DAT
Viruses are self-replicating.
It automatically infects "acad.lsp" and “acad.mnl” files in the compromised machine.
Use current engine and DAT files for detection and removal.
Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).