Many inboxes around the world will be seeing what appears to be an email from a friend this morning - and may be unaware that the attachment actually contains a malicious Trojan horse.

The emails, which have the subject line "hi friend", are short and to the point:

Attached to the emails is a file, t658657.zip, which contains the Mal/EncPk-LE Trojan horse.

Of course, anyone with common sense would never have opened the unsolicited attachment in the unsolicited email in the first place. But sadly common sense isn't very common when it comes to computer security - and chances are that there are people out there whose mouse finger will have got twitchy at the mere thought of an email, and opened the attachment in curiousity without thinking of the possible consequences.

Get smart about securing your computer and protecting your data - don't let a simple trick like this be exploited by cybercriminals to infect your PC.