This new variant of the Skulls mobile phone virus appears to be a free “pirated“ copy of F-Secure's Anti-virus product for Mobile phones. Besides the legal and ethical considerations for using pirated copies of software, this new virus will lock the phone permanently until cleaning is accomplished by buying the real product. This social engineering scheme illustrates the dangers of installing free software offered by email, instant messaging, or other sources.

Skulls.L - Pretends to be F-Secure's Mobile AV product
http://secunia.com/virus_information/18734/skulls.l/
http://www.f-secure.com/v-descs/skulls_l.shtml

Skulls.L - Weblog Entry
http://www.f-secure.com/weblog/archives/ar...5.html#00000575

Skulls.L is a variant of SymbOS/Skulls.C trojan. The component files of the trojan are almost identical to Skulls.C. The main difference between Skulls.L and Skulls.C is that Skulls.L pretends to be a pirate copied version of F-Secure Mobile Anti-Virus.

REMOVAL Techniques - Disinfection with two Series 60 phones

Download F-Skulls tool from ftp://ftp.f-secure.com/anti-virus/tools/f-skulls.zip or directly with phone http://www.europe.f-secure.com/tools/f-skulls.sis

1. Install F-Skulls.sis into infected phones memory card with a clean phone
2. Put the memory card with F-Skulls into infected phone
3. Start up the infected phone, the application menu should work now
4. Go to application manager and uninstall the SIS file in which you installed the Skulls.L
5. Download and install F-Secure Mobile Anti-Virus to remove any Cabirs dropped by the Skulls.L
http://www.europe.f-secure.com/estore/avmobile.shtml
or with mobile itself
http://mobile.f-secure.com
6. Remove the F-Skulls with application manager as the phone is now cleaned