Valcard is a mass-mailing worm. It is written in Visual Basic and
is packed with UPX file compressor. The worm disguises itself as
Macromedia Flash player, it is supposed to play a sound file and
show a cute image (this functionality sometimes fails due to a
bug in worm's code).
The worm spreads itself in e-mail with different subjects and
bodies and an attachment named 'ValentineCard.exe'. The worm
collects e-mail addresses from Outlook Address Book and sends
itself to all these addresses.
Valcard worm installs itself to system as 'ValentineCard.exe' and
modifies Windows Registry to be run in all Windows sessions. On
Thursdays the worm is supposed to extract and show a strange JPG
image, but this fails due to a bug as the worm extracts sound
file data into a picture file.
[Analysis: Alexey Podrezov; F-Secure Corp,; March 4th, 2002]
