Summary
Worm:SymbOS/Yxe is the first malicious software to target Symbian S60 3rd Edition Phones.
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.
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
Worm:SymbOS/Yxe variants are complied for S60 3rd Edition phones and will not install on older Symbian phones.
Variants of Worm:SymbOS/Yxe include:
- Worm:SymbOS/Yxe.gen
- Worm:SymbOS/Yxe.A
- Worm:SymbOS/Yxe.B
- Worm:SymbOS/Yxe.C
- Worm:SymbOS/Yxe.D
Installation
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 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.
Actions
Yxe starts automatically when the phone boots and 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.
Removal
Worm: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.
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