Cluley said there may be a connection between the creators of Sasser and Netsky.
While many businesses are being affected, Sasser has also hit home users, especially those with broadband connections.
"It really preys on paranoia about the Sasser worm, " said Graham Cluley, senior technology consultant for Sophos.
Sasser does not have a malicious payload, meaning it does not destroy or alter information within a computer.
" Democratic Senator James Sasser of Tennessee believes that "it might well be the dominant issue in this fall's campaigns.
Jim Sasser (D), who was preparing a bid to become Senate majority leader and never realized Frist's threat until it was too late.
Sasser scans random Internet protocol addresses until it finds a vulnerable system.
"Sasser is a successful and widely propagating worm with a somewhat benign impact to the end user, " said Chris Rouland of Internet Security Systems.
As Sasser moves from machine to machine, it is also possible to create a "back door, " leaving open the possibility of later remotely take over control of a user's computer.
Just as a virus that affects humans can mutate and confound medical experts, each version of Sasser -- labeled A, B, C, and D -- poses slightly different challenges for information technology experts.
In a cunning twist by the virus writers, an e-mail in wide circulation that purportedly offers a "fix" for the Sasser worm actually infects the user's computer with a different virulent worm, known as Netsky-AC.
But to me and many people here today, like guys I see, Bill Bradley and Jim Sasser, who long left the Senate for greener pastures, and I hope better remuneration -- we used to kid about that, too -- but I -- for a lot of us, he was a friend, and he was a mentor and he was a guide.
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