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Newest Bagle On The Loose: Page 3 of 3

Most anti-virus firms have tagged the new Bagle as a medium-level threat. Symantec, for example, pegged it as a "3" in its 1 through 5 scale, while McAfee, Computer Associates, and Trend Micro bumped it up to "Medium" after its numbers climbed.

"It's not unusual for hackers to release worms very early in the morning and later in the week," said CA's Ribaudo. "That gives time for the worm to be seeded before people get to the office and start opening mail. And later in the week and on the weekend is when fewer [IT] people are around," she said.