The Friday the 13th virus

Graham Cluley
@gcluley

Do you suffer from friggatriskaidekaphobia?

A surprising number of people appear to believe that something horrible will befall them when the 13th day of the month falls on a Friday. Some are almost paralysed with anxiety as superstition has it that Friday the 13th is a day of bad luck.

And if you’re a computer virus historian (or have just been kicking around for a while) you may well remember that Friday the 13th was a notable date for malware as well.

In the late 1980s and early 90s it wasn’t unusual to hear “computer experts” and the media advise computer users to be particularly careful in the run-up to Friday the 13th, as the then prevalent Jerusalem virus might spring its payload. Furthermore they often advised that PC users should change their system clock to complete avoid their computer ever thinking it was Friday 13th, and leapfrog over to Saturday 14th instead.

A quick…

Read more in my article on the Naked Security website.

Found this article interesting? Follow Graham Cluley on Twitter to read more of the exclusive content we post.


Graham Cluley is a veteran of the anti-virus industry having worked for a number of security companies since the early 1990s when he wrote the first ever version of Dr Solomon's Anti-Virus Toolkit for Windows. Now an independent security analyst, he regularly makes media appearances and is an international public speaker on the topic of computer security, hackers, and online privacy. Follow him on Twitter at @gcluley, or drop him an email.

What do you think? Leave a comment

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.