Discovered: December 18, 2001
Updated: February 13, 2007 11:54:13 AM
Also Known As: JS.Exception.Exploit, JS/Coolsite@MM, W32/Cool.A-mm
JS.Coolsite@mm is a Java Script worm. If you are using Norton AntiVirus with definitions dated August 16, 2001 or later, you are already protected from this worm, which will be detected by those definitions as JS.Exception.Exploit.
Symantec Security Response has created a separate detection for this variant, and definitions dated December 19, 2001 or later will detect it as Coolsite@mm.
The worm arrives as an email with the subject "Hi!!" and the message "Hi. I found cool site!..."
Antivirus Protection Dates
- Initial Rapid Release version December 19, 2001
- Latest Rapid Release version August 20, 2008 revision 017
- Initial Daily Certified version December 19, 2001
- Latest Daily Certified version August 20, 2008 revision 016
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
The worm arrives as an email with the following characteristics:
Message: Hi. I found cool site! http: <address omitted> It's really cool!
The script sends the email message to everyone in your Microsoft global address book.
It will also set the default home page for Internet Explorer to a pornographic Web site.
For additional information on how the script runs, read the JS.Exception.Exploit writeup.
Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":
- Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
- Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
- Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
- Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
- Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
- Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
- If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
- Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
- Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
- Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
- Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
- If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
- For further information on the terms used in this document, please refer to the Security Response glossary.
To remove this worm, delete files that are detected as JS.Exception.Exploit or JS.Coolsite@mm, and then reset the Internet Explorer home page.
To remove the worm:
- Run LiveUpdate to make sure that you have the most recent virus definitions.
- Start Norton AntiVirus (NAV), and make sure that NAV is configured to scan all files. For instructions on how to do this, read the document How to configure Norton AntiVirus to scan all files.
- Run a full system scan.
- Delete all files that are detected as JS.Exception.Exploit or JS.Coolsite@mm.
To reset the Internet Explorer home page:
- Start Microsoft Internet Explorer.
- Connect to the Internet and go to the page that you want to set as your start page.
- Click Tools and then click Internet Options.
- On the General tab, click Use Current, and then click OK.
Writeup By: JP Duan