Threat Description

CoolNot

Details

Aliases:CoolNot
Category:Malware
Type:Worm
Platform:VBS

Summary



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



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More

You may wish to refer to the Support Community for further assistance. You may also refer to General Removal Instructions for a general guide on alternative disinfection actions.



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 Created: Analysis: Katrin Tocheva and Sami Rautiainen, F-Secure


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