SymbOS.Mabir

SymbOS.Mabir is a worm that propagates through Bluetooth and MMS. The worm runs on the Symbian OS, which is used as the operating system for Nokia Series 60 cellular telephones.

Technical Details

Once executed, SymbOS.Mabir performs the following actions:

Creates the following files on the device:

\SYSTEM\SYMBIANSECUREDATA\CARIBESECURITYMANAGER\CARIBE.APP
\SYSTEM\SYMBIANSECUREDATA\CARIBESECURITYMANAGER\CARIBE.RSC
\SYSTEM\RECOGS\FLO.MDL
\SYSTEM\SYMBIANSECUREDATA\CARIBESECURITYMANAGER\CARIBE.SIS
\SYSTEM\SYMBIANSECUREDATA\CARIBESECURITYMANAGER\INFO.SIS

Sends MMS messages to the phone numbers of newly received MMS messages. The worm includes a copy of itself as an attachment.

Scans for other Bluetooth-enabled devices to send itself to. The worm will attempt to send itself to any Bluetooth devices found.

Executes every time the compromised device is powered off and powered back on.

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 Instructions :

Install a file manager program on the device.

Enable the option to view the files in the system folder.

Navigate to the following folder:

\SYSTEM\SYMBIANSECUREDATA\CARIBESECURITYMANAGER

Delete the following files:

CARIBE.APP
CARIBE.RSC
CARIBE.SIS
INFO.SIS
INFO.SIS

Navigate to the following folder:

\SYSTEM\RECOGS

Delete the following file:

FLO.MDL

Exit the file manager.

Additional information

Symantec recommends the following to protect against this threat:

 

If Bluetooth is not required, it should be turned off.
If you require the use of Bluetooth, ensure that the device's visibility setting is set to "Hidden" so that it can not be scanned by other Bluetooth devices.
Avoid use of device pairing. If it must be used, ensure that all paired devices are set to "Unauthorized". This requires each connection request to be authorized by the user.
Do not accept unsigned applications (no digital signature) or applications sent from unknown sources. Be absolutely sure of the origin of the application before accepting it.

More info visite http://securityresponse.symantec.com/avcenter/venc/data/symbos.mabir.html

Caution : we dont take any resposbilty if your phone is damamged, Experiment at your own risk.