Between three to five per cent of corporate systems are infected by bots, according to a study by security firm Damballa.

The internet security company is promoting its own line of security appliances, designed to block communications between infected hosts and zombie-control servers, as an added layer of protection in addition to conventional anti-virus defences. Slight self-interest here but Damballa reckons the average gap between malware release and detection using conventional antivirus is 54 days.

Two months! One thing many people forget to check on their PC are open ports. You can do a free port scan online and get information on how to plug those open communication ports. You wouldn't want a zombie hijacking your bandwidth calling the mother-ship.

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