They infect HyperCard stacks. Apple's SIMM Stack. It does no active harm to your Mac. Many anti-virus utilities, including Disinfectant, ignore these HyperTalk viruses, but latest versions of SAM and Virex do check for them. Another form scriptable virus can infect Microsoft Word 6.0 documents and templates.
Infected documents appear with the template icon, rather than the usual document icon.
Delete infected files. The Good Times virus hoax seems to be on the rise again. In the former case, rebuilding the Desktop should help. If so, check it. While you are at it, also uncheck the Inited bit.