Gamblers who are trying to win big on Saturday’s Grand National may receive attacks from hackers, looking to cash in on online betting. Webroot’s Threat Research team reports an increase in the number of keyloggers that are being updated by the malware creators.

Nick Banks, managing director EMEA of Webroot’s Consumer Business Unit, said: “Since January 2008, 44% of the keyloggers identified by our automated threat research method have been updated, while 28% of new keyloggers identified so far this year have already been updated. Hackers churn out updates or new variants to get past detection at the desktop, so that they can continue to harvest personal information unchallenged.” Online gambling is expected to increase in revenue’s, with sites offering double ups on deposits and big jackpots being won. Webroot has developed a free computer scan tool to check for spyware, viruses and other threatening forms of malware.