A simple class infecting macro virus with no payload. Although similar to Thus.
H is more closely related to Thus.
However, despite the only code difference between Thus. H and .C being a single line, in one sense this is a large difference, as that single difference defangs the typical Thus family payload. A. the .H variant does not attempt to determine whether the normal template is already infected, nor does it delete any existing code in the normal template's default document class object. However, as in the .A variant, Thus. H only infects the normal template if its default document class object contains no code immediately before the infection, so the presence of any macros in the normal template's default document class object module protects it from infection by Thus.