Trojan:SymbOS/AppDisabler is a family of malicious SIS file trojans, which attempt to disable a number of Symbian OS system and third party applications.
To perform this disinfection routine, use the F-Skulls utility tool to allow installation of F-Secure Mobile Anti-Virus, then install F-Secure Mobile Anti-Virus to remove the infection.
Download F-Skulls tool from ftp://ftp.f-secure.com/anti-virus/tools/f-skulls.zip or directly to a clean phone from https://www.f-secure.com/tools/f-skulls.sis.
CAUTION This method will remove all data on the device, including calendar and phone numbers
In addition to disabling applications, some AppDisabler variants replace the phone operator logo and background image. Other variants will drop additional malware on the system.
Some Appdisabler variants are nonfunctional; due to a bug or implementation error, they do not run as intended.
When installing itself AppDisabler replaces the main executable of several system and third party applications by overwriting their main executable file. These files must be reinstalled to repair the damage.
Listed below are some representative examples of Appdisabler variants:
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