When an infected document is opened the virus copies itself to the
global template. Then it infects every document opened or saved with
"File/Save As" menu.
At April 4th the virus activates its payload when a document is
opened. It then attempts to format the "C:" drive and displays a
message box with the following text:
Its cool DuDe's Birthday!!
The virus also hooks two menu selections. "File/Print" inserts an
additional "z" character to the current position of the cursor before
printing and "Tools/Macros/Macro" does not do anything.
[Analysis: Sami Rautiainen, F-Secure]