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Coolnow


Aliases:


Coolnow
Menger, JS.Menger
JS/Coolnow

Malware
Worm
JS

Summary

Coolnow is a worm that uses Microsoft Messenger to propagate. It uses a vulnerability to execute its code via Internet Explorer.



Disinfection & Removal

Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.



Technical Details

The worm spreads a message via MSN messenger that contains a link to an infected web page. Some of the messages looks as follows:

 URGENT - Go to http://xxx.xxxxxxxx.xxx/xxxX/mel Now
   ATTeNT!oN - Go to: http://xxx.xxxxxxxxx.xxx/xxxxx_Xxx/teztx1.htm Now

Note! There are several links where the worm code is available. We are trying to shut down these pages which are not disabled yet.

When an user clicks on the link in the MSN message, Internet Explorer will open the page and execute the JavaScript code in the page. This is the actual worm.

The worm uses an vulnerability to execute. It goes through the users MSN contact list and sends a message with a link to an infected site to each recipient.

Further information, including a fix for the vulnerability, is available from Microsoft at: http://www.microsoft.com/technet/security/bulletin/MS02-005.asp

For PocketPC users:

This worm does does not affect PocketPC 2002. Internet Explorer version in PocketPC cannot execute the worm code because its JavaScript implementation does not support activation of MSN messenger via a script.



Detection

F-Secure Anti-Virus detects the worm with updates released on February 14th, 2002 at 13:15 local time (GMT+2).



Description Created: Analysis: Katrin Tocheva, Sami Rautiainen and Jarno Niemela, F-Secure; February 14th, 2002



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