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

You may wish to refer to the Support Community for further assistance. You also may also refer to General Removal Instructions for a general guide on alternative disinfection actions.








Technical Details: Alexey Podrezov, F-Secure Corp


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