A trojan by the name of "Skulls" has appeared in the wild for some Series 60 smartphones, and users are warned to be wary as always.
Series 60 owners who like to customize their handsets beware. A new trojan horse program has been spotted in the wild that affects the Nokia 7610, and possibly other models.
Codenamed "Skulls", the trojan appears as a theme manager installer program named "Extended theme.sis". (SIS files are Symbian OS installation programs, similar to CAB files for Windows.) When installed, however, the program replaces all ROM-based application icons with an image of a skull and alters the icon links such that they no longer refer to actual applications. As a result, applications will not launchable. Basic phone functionality appears unaffected.
The trojan works by installing non-functional duplicates of ROM-based applications into the device's RAM. The OS then recognizes those fake programs instead of the ROM-based ones and presents those to the user. The ROM-based applications themselves appear to be unaffected.
Users who become infected with Skulls are advised to not reset their phone but use either an anti-virus program to remove it or use a third party file manager to manually delete the offending files. Skulls apparently does not affect user data, and is unable to spread itself to other devices without user intervention. Security firm F-Secure has more detailed removal instructions.
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