This type of trojan secretly installs spy programs and/or keylogger programs.
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Trojan-Spy:W32/Banker is a large family of data-stealing trojans. Banker variants attempt to steal access information for various online banking and payment system websites. Details stolen include login credentials, passwords, PINs and so on. The stolen information is usually uploaded to a hacker's website using a webform.
The most vulnerable users are those whose logins and passwords for sensitive online banking or payment accounts remain static at each login session. For this reason, many online banking websites are changing their security processes to use one-time passwords that expire after being used once.
The details below are for Trojan-Spy:W32/Banker.VT and are representative of most variants in the Banker family.
Trojan-Spy:W32/Banker.VT targets data related to Japanese banking websites. The trojan's file is a PE executable file 65536 bytes in size. The file is unpacked, an unusual feature since most malware today is packed by a file compressor.On first executing the file, Banker.VT copies its file as SYSTEM.EXE to the root of C: drive and creates a startup key for that file in the Registry:
This is done to run the trojan's file every time Windows starts. The trojan also deletes the Zone.Identifier stream for its file. This trick is not commonly used in present day malware.
While active, the malware monitors the web browser and activates its spying component if any of the following URLs are opened:
The spying component steals any data entered by a user in the following fields:
The stolen data is uploaded using a webform to the website:
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