More than 60 percent of today's malicious code goes undetected by antispam and antivirus tools at work in business, despite their use by 98 percent of organizations.

Hackers are yesterday's news, according to the 2006 AusCert Computer Crime Survey.

Today, organized crime is pushing an agenda of malicious code which, Ingram said, has changed the corporate landscape.

"We have always dealt with very large numbers from worm and virus infections, but trojan and rootkit activity has always been hidden and this year one in five enterprises are getting hit by trojans or rootkits," he said.

"When the amount of malicious code in the form of trojans or rootkits that's commonplace today is compared with the adoption of antivirus and antispam hardware (respondent enterprises reported use of either or both), then such security technology is [apparently] rendered useless against rootkits."