The worm also has updating capabilities. It will attempt to download updated versions when certain conditions are met.

The worm will stop spreading on 10th of September 2003. From this date onwards the worm will exit immediately when executed.

Infection

It will install itself into:

%windir%\winppr32.exe

Proceeding then to add the following keys to the Windows Registry:

[HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] "TrayX" = %windir%\winppr32.exe /sinc

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] "TrayX" = %windir%\winppr32.exe /sinc

So it has started when Windows does.

Mail spreading

The worm usually arrives in e-mails with the following characteristics:

From:

The 'From:' field is filled with an address found from the infected system.
If no address is found, it will use "admin@internet.com"

To:

The 'To:' field is filled with an address found from the infected system.

Subject, any from the list:

• Re: Thank you!

• Thank you!

•  Your details

•  Re: Details

•  Re: Re: My details

•  Re: Approved

•  Re: Your application

•  Re: Wicked screensaver

•  Re: That movie 

Body

It chooses one from the two following lines:

• See the attached file for details
• Please see the attached file for details.

Attachment name

The name is selected from the following list:

•  your_document.pif

•  document_all.pif

•  thank_you.pif

•  your_details.pif

•  details.pif

•  document_9446.pif

•  application.pif

•  wicked_scr.scr

•  movie0045.pif