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SymbOS/MapUp, Trojan:SymbOS/MapUp


Trojan:SymbOS/MapUP refers to a family of SMS-worms that spread on Symbian Series 60 3rd Edition and Symbian Series 60 5th Edition devices. It has no malicious payload, other than spreading itself.


Trojan:SymbOS/MapUp can be manually uninstalled by removing the following from the Application Manager:

  • Update Package
  • Ovi Store Installer
  • Ovi Update

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

In addition to spreading via malicious SMS messages, MapUp has also been found hosted on file-sharing websites,, disguised as an update package or theme.

An unusual feature of this malware is that its malicious executable file is a Symbian-signed SIS installer, containing sub-SIS installers that are also signed. All relevant publisher IDs and certificates have been added to revocation list by Symbian.

At the time of publishing, no reports of this malware have been received outside of China.


The worm is distributed using an SMS message containing a (varying) text message in Chinese and a link to a website. If the link is followed, an application will be installed promptly.

The worm has also been found hosted on various Chinese file-sharing websites in a file disguised as a Nokia update package or theme for Symbian Series60 3rd & 5th edition phones.


During installation, the MapUP trojan registers itself to start on the phone boot up. Once active on restart, the trojan attempts to connect to a website via a GPRS or 3G connection, infecting the phone and restarting the SMS spreading.

The trojan also clears the user's communication logs to hide its actions.