OSX.Inqtana.A

SUMMARY

OSX.Inqtana.A is a proof of concept worm that runs on Macintosh OS X and spreads by exploiting a the Apple Mac OS X BlueTooth Directory Traversal Vulnerability (as described in Bugtraq ID 13491).

Protection

• Virus Definitions (LiveUpdate™ Daily) February 17, 2006
• Virus Definitions (LiveUpdate™ Weekly) February 22, 2006
• Virus Definitions (Intelligent Updater) February 18, 2006
• Virus Definitions (LiveUpdate™ Plus) February 17, 2006

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

Distribution

• Distribution Level: Low

TECHNICAL DETAILS

The worm spreads to computers using three OBEX Push requests. If the user accepts these requests, OSX.Inqtana.A performs the following actions:

1. Creates the following files:
   
   
   • w0rm-support.tgz
   • com.openbundle.plist
   • com.pwned.plist
     
     
2. Exploits the Apple Mac OS X BlueTooth Directory Traversal Vulnerability (as described in Bugtraq ID 13491) to create the following files:
   
   
   • /Users/w0rm-support.tgz
   • /Users/InqTest.class
   • /Users/com.openbundle.plist
   • /Users/com.pwned.plist
   • /Users/libavetanaBT.jnilib
     
     
3. Creates the following folders, adding nonmalicious files used to run the worm:
   
   
   • /Users/javax
   • /Users/de
     
     
4. Creates the following two files, so that it starts when the Mac OS X starts:
   
   
   • /Users/[USER NAME]/Library/LaunchAgents/com.pwned.plist
   • /Users/[USER NAME]/Library/LaunchAgents/com.openbundle.plist
     
     
5. Searches for other Bluetooth-enabled devices to accept OBEX Push requests when the computer is restarted. If found, the worm attempts to send itself to the remote computer.
   
   Note: The worm attempts to spread by using a time limited demo version of the Avetana library, which is bound to a bluetooth address. As a result of this the worm may not be able to spread successfully.

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

1. Delete the following files:
   
   
   • /Users/w0rm-support.tgz
   • /Users/InqTest.class
   • /Users/com.openbundle.plist
   • /Users/com.pwned.plist
   • /Users/libavetanaBT.jnilib
   • /Users/[USER NAME]/Library/LaunchAgents/com.pwned.plist
   • /Users/[USER NAME]/Library/LaunchAgents/com.openbundle.plist
     
     
2. Delete the following folders:
   
   
   • /Users/javax
   • /Users/de