Information about the original VBS/LoveLetter.A is available at:
http://www.F-Secure.com/v-descs/love.shtml
This variant spreads in e-mails with the following content:
Subject: IMPORTANT: Official virus and bug fix
Body: This is an official virus and bug fix. I got it from
our system admin. It may take a short while to update
your system files after you run the attachment.
Attachment: Bug and virus fix.vbs
This variant replaces all files that have one of the following
extension with itself: ".exe", ".com", ".dll" or ".sys". This will
render the system to an unusuable state.
[Analysis: Katrin Tocheva, Mikko Hypponen, Alexey Podrezov and Sami Rautiainen, F-Secure]