Exploit code was published on Friday for a Windows flaw similar to the vulnerability that led to the Zotob worm that wreaked havoc in August.
Fewer businesses fell victim to the Zotob worm that struck corporate networks than previous attacks, but those it hit paid dearly, according to a new survey.
Antivirus firms have urged affected users to patch their systems immediately after a new worm was discovered over the weekend that exploits a critical vulnerability in some Windows platforms.
Havoc caused by variants of the Zotob worm could have been far worse had they not contained 'flaws', security companies said.
Variants of the Zotob worm caused damage to Visa and American Express' internal networks yesterday, but both companies said their transactional systems were unaffected. However, carmaker Holden had to pay a bigger price.
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