Skulls.V is a SIS file trojan that pretends to be installation file for Battery Extender software.
Download F-Skulls from ftp://ftp.f-secure.com/anti-virus/tools/f-skulls.zip or directly with phone https://www.europe.f-secure.com/tools/f-skulls.sis
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Spreading in: Ximplyfy Battery Extender.sis
When installed Skulls.V disables several built in applications, drops component files from Locknut.A, Doomboot.A and installs Cabir.B and Cabir.X
In addition of directly installing damaging files, Skulls.V also drops MGDropper.A into the device.
Skulls.V also installs a pirate copied version of Simworks Anti-Virus into the device.