Symantec's holiday spam listing is seeing an increase in threats which capitalise on the concept of a trusted source or Web site.
"People this season need to ask themselves: is it really you?" said Robert Pregnell, senior manager for Symantec's technical product management.
"Using an infected instant messaging program to send enticing messages to everyone in the address book is a way the 'attackers' message will appear to be from a 'trusted' source," he warned.
If an email or instant messaging program has been compromised, the threat will most often materialize in a way that it appears to have come from a known contact.
Attackers are also compromising the home pages of popular Web sites, allowing them to inject malicious code onto any system that visits the Web site which isn't adequately protected.
So-called free 'license' agreements required to watch, for example, a video on a social networking site, is another method of duping users into exposing their systems.
The license is not a license at all, more likely it is a piece of malicious code.
According to Symantec, Australia ranks 6th in the list of the top 10 countries originating spam across Asia-Pacific and Japan, and the number of malicious code samples (viruses, bots, trojans, worms) has almost doubled in the last six months.
"This particularly, even outside of the festive season, is an enormous increase over previous trends, and represents the most substantial growth ever seen before in any six month period," Pregnell said.
Attackers will take advantage of any means at their disposal over the Christmas season of increased online activity.
"Shoppers read email, they browse for products, they buy and pay for products, they converse with friends to say 'Merry Xmas' using IM, they send virtual Christmas cards, share Christmas photos etc," Pregnell said.
He warned that attackers are lurking in all of the corridors which consumers are using to conduct these activities, and will use Christmas related themes to dupe victims into exposing themselves to malicious activity.
"Spam and IM threats particularly are expected to rise over the Christmas period, taking advantage of the growing numbers of virtual interactions in the community."
Pregnell said that the kind of 'social engineering' tactics that mislead victims into thinking they are doing something valid or interacting with a trusted site are increasing at an alarming rate.
"This is particularly notable given the attackers no longer set out to 'damage' a computer system, but are instead seeking direct financial gain, or to obtain some information about the victim which can be sold to someone else.
"Therefore, the defences people need to have in place need to provide protection around an online interaction, not just protection of the computer system itself," he warned.
Pregnell said this was best achieved through a combination of user education and observing safe computer practices, as well as traditional anti-virus and protection technologies.