> Does Sircam attach that extra extension to the filename?
Yes, it appears to add the extension of files it attaches to. Other extensions include somefile.doc.pdf somefile.doc.com somefile.doc.bmp
> As long as virus senders are this stupid we won't have much to worry about
McAfee has listed the SirCam virus as HIGH RISK.
Many email users have already been tricked into opening the infected attachments because they have come from work colleagues, known business contacts, friends, relatives, etc. Government departments in several countries have been infected sending large attachments backwards and forwards to each other. I and some of my customers have received several infected email from Government email addresses in four countries.
SirCam is very nasty and we should be worried because it can attach to very large files and send them to multiple email addresses. There is no fun in receiving several email with large attachments even if you haven't opened any of them. Also it has to potential to lock users from receiving and retrieving email if their mail boxes become full.
More info can be found at