Threat Description

Trojan:​SymbOS/MerogoSMS

Details

Category:Malware
Type:TrojanWorm
Platform:SymbOS

Summary



Also known as a trojan horse program, this is a deceptive program that performs additional actions without the user's knowledge or permission.



Removal



If found, remove the following from the application manager:

  • Symbian S60 AknMime Services
  • Symbian S60 System InsSrv
  • Symbian S60 System UpdateSrv


Technical Details



Trojan:SymbOS/MerogoSMS refers to a series of SMS worms that has been found spreading on Symbian Series 60 3rd Edition and Symbian Series 60 5th Edition devices. The worm spreads as self-signed (untrusted) SIS installers, which contain sub-SIS installers some of them signed by Symbian. All the related publisher IDs and certificates have been added to revocation list by Symbian.

This malware is discussed in our Lab Weblog:

Arrival

The worm spreads by sending text messages that contain variable messages in Chinese and a link to a website at 117.135.138.234. If the link is followed, an application will be installed promptly.

Execution

The malware will be registered to start on the phone boot up, and tries to connect to a website at http://rec[...]rzwxdsu.com over GPRS or 3G connection, infecting the phone and restarting the SMS spreading.

The worm has also been spread on different Chinese file sharing web sites in a file disguised as a game or theme for Symbian Series60 3rd & 5th edition phones.

Note

No report on this malware has been received outside of China.






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