CoolNot

Threat description

Details

Category: Malware
Type: Worm
Platform: VBS

Summary

VBS/CoolNot is a worm, similar to the VBS/LoveLetter.



Removal

Automatic action

Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.

More scanning & removal options

More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.



Technical Details


Variant:CoolNot.A

VBS/CoolNot.A uses Outlook to sent itself to all recipients in every address book. The message that it sends is as follows:

 Subject:    Cool Notepad Demo     Body:       Hey check out this text file I sent it will do     something neat in notepad.     Enjoy :-)     Attachment: COOL_NOTEPAD_DEMO.TXT.vbs  

It copies itself to the Windows System directory as "COOL_NOTEPAD_DEMO.TXT.vbs" and adds a key to the registry so that it will be executed next time the system is restarted.

Then the worm replaces the "script.ini" file from the mIRC installation directory. The worm uses this modification to send itself to those users who join to the same channel as the infected user. In addition, the worm will join to the "#virus" channel and send a message "Cool Notepad Demo" to that channel.

As a payload, the worm adds a registry key that will hide the desktop after the system is restarted. This registry key is:

 HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoDesktop  

To restore your desktop, please download and execute the following registry file: ftp://ftp.F-Secure.com/anti-virus/tools/coolnote.reg





Description Details: Analysis: Katrin Tocheva and Sami Rautiainen, F-Secure


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