Internet users have been urged to use caution when visiting horseracing websites and placing online bets in the run up to this year's Grand National race on Saturday.


Webroot's threat research team has reported an increase in the number of keyloggers being rapidly updated by the malware authors who created them.


Nick Banks, managing director EMEA of Webroot's consumer business unit, claimed that the team had seen a trend that shows cybercriminals are becoming more sophisticated and dedicated to challenging anti-malware vendors.


Webroot claimed that since January 2008, 44 per cent of the keyloggers identified by its automated threat research method have been updated, while 28 per cent of new keyloggers identified so far this year have already been updated.


Banks said: “Hackers churn out updates or new variants to get past detection at the desktop, so that they can continue to harvest personal information unchallenged. Our advice to all PC users is to make sure you are running the latest version of a reputable anti-virus program or an internet security suite and practice safe online habits when providing any personal data over the internet. That includes financial information when betting online.”