F-Secure Trojan Information Pages : Cdropper.A
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Cdropper.A is Symbian installation file that will install Cabir.E and Cabir.D into the device and disables the Bluetooth control application. The original version of Cdropper.A is named Norton AntiVirus 2004 Professional.sis
The Cdropper.A installs different Cabir variants into several places in the device file system. Some of the installed Cabirs replace common third party applications so that if user has one of those applications installed into system it gets replaced with Cabir.D and it's Icon in the menu will go blank.
If user clicks on one of the replaced icons in the menu, the Cabir.D that has replaced that application will start and try to spread to other devices. If Cabir.D starts it will spread as Cabir.D ([YUAN].SIS) without other Cabir variants or Cdropper.A
The Cdropper.A will also install auto start component that tries to automatically start Cabir.D upon system reboot, but fails as the auto start component points into directory that is not installed on the device.
For more details of Cabir variants, see description of Cabir.D http://www.f-secure.com/v-descs/cabir_d.shtml
F-Secure Mobile Anti-Virus will detect the installed Cabir variants and delete the worm components. After deleting worm files you can delete go to application manager and uninstall the Norton AntiVirus 2004 Professional.sis
If your phone is infected with some Cabir variant and you cannot install files over bluetooth, you can download F-Secure Mobile Anti-Virus directl to your phone
- Open web browser on the phone
- Go to http://mobile.f-secure.com
- Select link "Download F-Secure Mobile Anti-Virus" and select phone model
- Download the file and select open after download
- Install F-Secure Mobile Anti-Virus
- Go to applications menu and start Anti-Virus
- Activate Anti-Virus and scan all files
Installation to system
When Cdropper.A is installed into the system it will install files into following directories:
\images\
\sounds\digital
\system\apps
\system\install
\system\recogs
\system\apps\btui
\system\apps\fexplorer
\system\apps\file
\system\apps\freakbtui
\system\apps\smartfileman
\system\apps\smartmovie
\system\apps\systemexplorer
\system\apps\[yuan]
Some of the Cabir variants are installed into default installation directories of common third party applications. The applications are FExplorer, SmartFileMan, Smartmovie and SystemExplorer.
The Cdropper.A will also install non-functional version of the Bluetooth control application, so that user cannot change bluetooth settings without disinfecting the device first.
Spreading in
Norton AntiVirus 2004 Professional.sis
F-Secure Mobile Anti-Virus for Symbian detects this malware starting from the update build number 7.
Write-up: Jarno Niemela December 9th, 2004
Description Updated: Mika Tolvanen, January 13, 2006
F-Secure Corporation
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