JS/Coolsite.A@mm is a mass mailer written in Java Script. It uses a
vulnerability in Internet Explorer to execute itself directly
from an infected web page.
Further information about this vulnerability, including a fix, is
available from Microsoft:
When the worm executes, it first changes the Internet Explorer
start page to an adult web site. After that the worm reads emails
from the Sent mail folder and sends the following message to each
of them:
Subject: Hi!!
Body: Hi. I found cool site! http://celebxx.cjb.net It's relly cool!
After sending, the worm deletes messages to hide itself from the
end user.
The worm is not written to send out any attachments but to
activate from a web page. Because of the method that it uses, it
might send out with itself attachments which were originally
included in the messages in the Sent mail folder.
F-Secure Anti-Virus detect this worm with the current updates.
[Analysis: Katrin Tocheva and Sami Rautiainen, F-Secure Corp., December 18th, 2001]
