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:
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.
Yxe starts automatically when the phone boots and attempts to terminate:
Yxe attempts to avoid debugging and terminates the processes of many third party file/process viewing utilities.
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.
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.