Security company Sophos advises on a computer worm lurking in mass emails asking you to help the victims of last month's Asian tsunami disaster. The worm appears with the subject line: "Tsunami donation! Please help!" and invites you to open an attachment called "tsunami.exe" -- which, if opened, will forward the virus to other Internet users.

Sophos added that it had so far only received a small number of reports of the worm, which it said was not the first to try to take advantage of the Indian Ocean catastrophe in order to spread.

Sophos recommends recipients delete the mails and do not open the attachments.