Internet Security Threats

1. Infects .asp .htm .html files found on local system.
   
   
2. Adds the following subkeys to the registry:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   
   
3. Deletes the run subkeys of predetermined security-related software.
   
   
4. Copies itself to network shares using a list of weak passwords.
   
   
5. Copies itself to remote password shares using a dictionary attack against weak share passwords.
   
   
6. May infect executables on the local drive.
   
   
7. Copies itself to other locations.
   
   Note: the partition root drive, network share roots drive and %System% are used by known variants.
   
   
8. May create [DRIVE LETTER]\autorun.inf.
   
   
9. May delete files with the following extensions from the root directory local partitions, except C:
   
   
   • .gho
   • .exe
   • .scr
   • .pif
   • .com
     
     
10. Ends processes based on process names, window names and service names.
    
    
11. Removes local network shares.

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.