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Worm:SymbOS/Yxe

First posted on 26 February 2009.
Source: SecurityHome

Aliases :

There are no other names known for Worm:SymbOS/Yxe.

Explanation :

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

right]Symbian S60 3rd Edition

Worm: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 Worm:SymbOS/Yxe include:

• Worm:SymbOS/Yxe.gen
• Worm:SymbOS/Yxe.A
• Worm:SymbOS/Yxe.B
• Worm:SymbOS/Yxe.C

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.

Actions

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
oot.sisx".

Yxe modifies the file C:systemdataSystem.ini.

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

It starts automatically when the phone boots.

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.

Last update 26 February 2009

 

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