Threat Description



Aliases:Papa, Poppa, Pappa, Bubba


X97M/Papa is an Excel 97 macro worm. It's quite similar to the widespread W97M/Melissa virus, but is probably not written by the same writer.


Automatic action

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


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

The Papa.A variant has a serious bug in it's code and it does not work. This bug was fixed in the Papa.B variant which is able to spread via Internet.

Every time when a XLS file infected by Papa is opened, it e-mails a copy of itself via e-mail, using Microsoft Outlook, to the first 60 people in the Address Book.

The e-mail sent by the worm looks like this:

From: (name of infected user)
  To: (60 names from alias list of the infected user)
  Subject: Fwd: Workbook from and Fred Cohen
  Urgent info inside.  Disregard macro warning.
  Attachment: XPASS.XLS

If the attached file is opened, it looks like this:

It is important to notice that Dr. Fred Cohen and the website at have nothing to do with the worm. Authors of this worm simply want to harass him. In addition, the worm will try to overload the web server by repeatedly pinging it.

The worm won't spread further to other XLS files, it just mails XPASS.XLS around.

Technical Details: Mikko Hypponen and Katrin Tocheva, F-Secure


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