Coolsite
Summary
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.
Removal
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
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Check for the latest database updates
First check if your F-Secure security program is using the latest updates, then try scanning the file again.
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Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
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Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.
Technical Details
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.