Most people wanted to make the user interface of the mobile phones more attractive. For this purpose they install themes. Sometimes the installed theme file may be "Extended theme.SIS" which informs you that it is the theme manager for Nokia 7610 smart phone. Then beware-you may have installed Skulls virus. After the Skulls get the control of your mobile, you will see all the icons of the applications in the menu will be replaced by the image of skulls. I have provided a screenshot below:
Fortunately Skulls allows to make and receive calls. But all other application including SMS and MMS will be disabled by Skulls. If you find that your phone contains Skull virus it is more important that you should not reboot your phone. Rebooting the phone will make it difficult for removing the Skull virus.Skulls trojans are targeted against Symbian Series 60 devices, but it can also affect other Symbian devices, for example Nokia 9500, which is a Series 80 device. However when trying to install Skulls trojan on Nokia 9500, user will get a warning that the SIS file is not intended for the device, so risk of accidental infection is low.
For manual removal of Skulls from a compromised device, it is necessary to reinstall all overwritten applications. The SymbOS/Skulls SIS installer must then be deleted. If this does not restore the phone, a formatting the phone may be necessary. All data saved in the C drive will be lost during a format.
