Threat Descriptions

CoolNot

Classification

Category :

Malware

Type :

Worm

Platform :

VBS

Aliases :

CoolNot

Summary

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

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:

  • 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.

  • 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.

  • 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

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