Trojan:​SymbOS/Yxe, Worm.SymbOS.Yxe, SymbOS/Yxes.A!worm (Other)


Trojan:SymbOS/Yxe is malicious software for Symbian S60 3rd Edition Phones.

Manual Removal

Yxe does not utilize a hidden interface. If the App manager is available, Yxe can be removed. The user only needs to locate the application name that was presented during installation. Example: Sexy View.

The log file (mr.log) and the SISX file (root.sisx) will not be deleted during uninstallation.

Infection Prevention

S60 phones have a list of valid certificates. To maintain a current list of valid certificates, the application manager settings should be adjusted from the defaults. The default App. manager setting for Online certif. check is Off.

The On setting is necessary to remove revoked certificates from your phone during installation.

Online Certificate Check details from Nokia:

  • You should have network access to install applications if check is on.
  • This may pose cost of data transfer to you.
  • "On" means that if the connection to the server fails, installation can be done. A revocated application can in that case be installed.
  • "Must be passed" means that if the connection to the server fails, you will not be able to install.

Suspect a file is incorrectly detected (a False Positive)?

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 detection database 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.

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Submit a sample

Submit a file or URL for further analysis.

Technical Details

Symbian S60 3rd Edition

Trojan:SymbOS/Yxe variants are complied for S60 3rd Edition phones. The installation file will not install on older Symbian phones.

Yxe variants have been Symbian signed using a valid certificate. They will install normally on S60 3rd Edition phones.

The certificate used by Yxe are in the process of being revoked. The disinfection section contains additional details regarding certificates.

Variants of Trojan:SymbOS/Yxe include:

  • Trojan:SymbOS/Yxe.A
  • Trojan:SymbOS/Yxe.B
  • Trojan:SymbOS/Yxe.C


Social engineering is used to entice the user into installing Yxe.

The installer prompts the user to install "Sexy View" by the vendor "Play Boy".

The user is offered English and Chinese language options. However, there is no user interface.


Yxe attempts to terminate:

  • AppMngr

Yxe attempts to avoid debugging and terminates the processes of many third party file/process viewing utilities.

  • ActiveFile
  • TaskMan
  • TaskSpy
  • Y-Tasks

Yxe collects data about the phone.

It will attempt to open an HTTP connection in order to upload the data and keeps the connection open at all times.

The domain list to which Yxe attempts to connect is encrypted within the code of Yxe.

Once connected it starts writing a log file called mr.log. It creates a sis file named "c:\data\root.sisx".

Yxe modifies the file C:\system\data\System.ini.

It will attempt to send SMS messages to the phone's contact list.

It starts automatically when the phone boots.


Trojan:SymbOS/Yxe will uninstall itself. The name in the application manager depends on the variant.

The name "Sexy View" has been used by early Yxe variants. See the disinfection section for additional details.