This is a 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.
Indication of Infection
Viral code appended at end of .vbs files.
Methods of Infection
Executing the infected .vbs file will infect all .vbs files found in the current directory.