Some variants of this virus family also infect HTA and HTT
files. Some of them lower the security settings of IE's zones. To ensure
that the virus works on all platforms, when infecting VBS and DOC files,
it comments out the HTML-specific part of itself. It infects documents when
Some variants of VBS/Hopper are able to infect Excel files as well.
[Analysis: Katrin Tocheva, F-Secure]