Threat Description

Drever.C

Details

Aliases: Drever.C, SymbOS/Drever.C
Category: Malware
Type:
Platform: W32

Summary



Drever.C is a malicious SIS file trojan that attacks bootloader files of several mobile Anti-Virus programs, and tries to attack F-Secure Mobile Anti-Virus by overwriting its files.

The Drever.C attacks bootloader files of Kaspersky, Simworks and F-Secure Symbian Anti-Virus products.

In addition of trying to overwrite the bootloaders, the Drever.C will also try to cripple F-Secure Mobile Anti-Virus by replacing it's binaries with corrupted ones.

However as F-Secure Mobile Anti-Virus contains protection against any modification attempts of its own files, both attacks will fail when Anti-Virus is in realtime scan mode as it is by default.

If the F-Secure Mobile Anti-Virus is switched off, or in manual scan mode, which is basically same as switched off. The attack will damage Anti-Virus, but user can recover easily by re-installing Anti-Virus.



Removal



Drever.C can be disinfected easily by using F-Secure Mobile Anti-Virus available from http://www.f-secure.com/estore/avmobile.shtml

Or you can uninstall it by uninstalling the SIS file in which Drever.C was installed from using application manager:

  • 1. Open the application manager
  • 2. Uninstall New_bases_and_crack_for_antiviruses.sis
  • 3. Re-install your Anti-Virus


Technical Details



Payload

When Drever SIS file is installed to the system it try to replace the bootloader files used by Kaspersky, Simworks and F-Secure Symbian Anti-Virus products with corrupted versions. In addition of bootloader files the Drever.C will also install corrupted binaries or F-Secure Mobile Anti-Virus and corrupted licence file of Simworks Anti-Virus.

If the device has F-Secure Mobile Anti-Virus with updated databases, the Drever.C will be detected before it can be installed. If the device does not have up to date databases, the install will still fail as attempt to overwrite F-Secure Anti-Virus files will crash the application installer, thus terminating the installation of Drever.C

The files are corrupted by manually editing them and writing text '123' into random locations in the files.

Some of the edited files contain strings intended as messages to AV vendors:

FSECURE MUST DIE!!!!!!
 Please, don't make new antiviruses for my viruses and I stop make
 viruses for your antiviruses. My target is Simworks!
 =)


Spreading in: New_bases_and_crack_for_antiviruses.sis



Detection


Detection for this malware was published on March 21th, 2005 in the F-Secure Mobile Anti-Virus
Detection Type: Mobile
Database: update build 31



Description Created: Jarno Niemela March 22nd, 2005;


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