Devious virus attacks on the rise
Hackers are getting faster at finding security holes to target too, says a survey by anti-virus firm Symantec.
New ways of spreading viruses, as well as combinations of malicious code and software holes are also being used to cripple systems.
Analysts say it should be a warning to companies to be extra vigilant in protecting their systems.
The speed and use of so-called "blended threats" that combine malicious code while exploiting software holes is one of the biggest threats facing businesses this year, the report suggests.
The Slammer worm at the start of 2003 hit global systems in less than a few hours.
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