VBS.Crazy

SUMMARY

This VBS script file uses mIRC and Pirch channels to spread. It works only if mIRC or Pirch is installed on your computer.

Threat Assessment

Wild

• Wild Level: Low
• Number of Infections: 0 - 49
• Number of Sites: 0 - 2
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Easy

Damage

• Damage Level: Low
• Payload Trigger: On the 16-th or 28-th of any month or year.
• Payload: Displays the message "Your Crazzzy!!!".

Distribution

• Distribution Level: Low
• Name of Attachment: Toofunny.vbs
• Size of Attachment: 2 K to 4 K
• Target of Infection: mIRC and Pirch

TECHNICAL DETAILS

When you execute this worm:

1. It creates the following text files in the C:WindowsSystem folder:
   • Sys1.dll
   • Sys2.dll
2. It writes an mIRC script in Sys2.dll and a Pirch script in Sys1.dll to send itself to other users of mIRC and Pirch.
3. It copies Sys1.dll to C:Pirch98Events.ini and C:Pirch32Events.ini.
4. It copies Sys2.dll to the C:MircScript.ini.
5. It copies itself to C:WindowsSystemToofunny.vbs.
6. It copies itself to C:WindowsStart menuProgramsStartUpSystem.vbs so that it runs at Windows startup.

Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

• Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack. If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.
• If a blended 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 (for example, all Windows-based computers should have the current Service Pack installed.). Additionally, please apply any security updates that are mentioned in this writeup, in trusted Security Bulletins, or on vendor Web sites.
• 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.
• Configure your email server to block or remove email that contains file attachments that are commonly used to spread viruses, such as .vbs, .bat, .exe, .pif and .scr files.
• Isolate infected computers quickly to prevent further compromising your organization. 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.

REMOVAL

To recover from this infection:

1. Run LiveUpdate to make sure that you have the most recent virus definitions.
2. Start Norton AntiVirus (NAV), and then run a full system scan, making sure that NAV is set to scan all files.
3. If any files are detected as infected by VBS.Crazy, click Delete.