Ella--That little alien in your Quark XPress document isn't a worm--it's an "easter egg"--a hidden feature that's not dicumented. To delete a box in Quark, you use Command-Shift-K. If instead, you use Command-Shift-Option-K, you can delete your box in a most amusing manner.
Actually, the most common viruses to affect Macs are those embedded in macros in MS Word and other MS products. More reason to hate that company.
--Charlie Baum