Threat Description

Feliz

Details

Aliases: Feliz, Feliz.Trojan, Feliz_Ano_Novo435200
Category: Malware
Type:
Platform: W32

Summary


The Feliz trojan appeared on the 1st of January 2000. This trojan is written in Delphi. Being run the trojan first outputs a dialog with a picture and a single button:

When the button is clicked the trojan looks for C:\Windows\ directory and if it is found outputs the final messagebox:

At the same time the trojan deletes the following files:

C:\COMMAND.COM  C:\WINDOWS\COMMAND\COMMAND.COM  C:\WINDOWS\SYSTEM.DAT  C:\WINDOWS\USER.DAT  C:\WINDOWS\SYSTEM.INI  C:\WINDOWS\WIN.INI  C:\WINDOWS\SYSTEM.CB  C:\WINDOWS\WIN.COM  

Then the trojan passes control to the operating system. At this time the operating system becomes unstable and it will no longer start after next computer reboot.

If C:\Windows\ directory is not found by the trojan it will output a number of messageboxes and pass control to operating system without activating its payload.



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More

Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for further assistance.







Technical Details:Alexey Podrezov, F-Secure Corp


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