F-Secure Trojan Information Pages: Locknut.E

Locknut.E is a malicious SIS file trojan that pretends to be patch for Symbian Series 60 mobile phones.

When installed Locknut.E drops a binary that will crash a critical System component. The result will prevent any application from being launched in the phone, thus effectively locking the phone.

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

1. Install F-Locknut.sis into infected phones memory card with a clean phone
2. Put the memory card with F-Locknut 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 locknut variant
5. Remove the F-Locknut with application manager as the phone is now cleaned

F-Secure Mobile Anti-Virus for Symbian detects this malware starting from the update build number 99.