Some corporations will also be concerned, said Chris Wysopal, chief technology officer of computer security consultant Veracode.

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Graham Cluley, senior technology consultant at computer security firm Sophos told CNN it was unlikely the attacker intended to cripple Twitter, or to cause widespread disruption.

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And Sinosun Technology, a maker of computer security software backed by Granite Global Ventures, which also backed Tudou, rose by 5.9% on Friday, after gaining 9.7% on Thursday.

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The fact that ILOVEYOU was seemingly unaffected by most companies' front-line defenses should serve as a wake-up call to businesses that in the ever-mutating world of computer viruses, security software must constantly be updated with the latest technology.

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Kerberos gained pre-eminence because it is clever, and because its developers, computer scientists at the Massachusetts Institute of Technology, released the source code, which let security experts around the world debug and refine the program line by line.

ECONOMIST: Microsoft