The worm arrives in an infected message sent with Outlook Express.
When it is viewed, by opening it or via preview pane, it first drops
"loveday14-a.hta" to the Windows Startup directory in both Spanish and
English versions of Windows.
When the system is restarted, "loveday14-a.hta" will be executed. Also
the worm creates an infected "index.html" file to the Windows System
Next it uses registry to replace the default signature of Outlook
Express 5 with the "index.html" created above.
On that way every time when an infected user send an email message,
the worm will embed its html code to this message.
Next the worm replaces the Internet Explorer start page point to a web
page, that contains another worm VBS/Valentine.A@mm. These two worms
download each other. Further information about VBS/Valentine.A@mm is
If the system date is 8thy, 14th, 23rd or 29th on each month, then
VBS/Sun.A will destroy the infected system. It will delete all
directories and their contents from the drive "C:".
In the place of the original directories, the worm creates a folder
with the same name adding a string "happysanvalentin". On that way a
directory with a name "My Documents" will become "My
This worm has been available on a public web page in the Internet and
it has been posted to several Usenet newsgroups. Even after the
infected web page has been removed from the Internet, the worm is able
to spread via Outlook Express.
This worm uses the same security vulnerability as JS/Kak.A@m. A fix
and futher information about this vulnerability is available from
Further information about JS/Kak.A@m is available at:
[Analysis: Katrin Tocheva and Sami Rautiainen, F-Secure; February 2000]