Brian Krebs was a man on a mission.

For months, the Washington Post tech reporter had been working with Internet security firms, collecting data on computer crime.

It paid off this week.

McColo Corp. is a Web hosting company with modern offices in a 38-story tower in San Jose, Calif.

Or at least it used to be.

It’s not one of the larger hosting companies around, but according to Internet security experts it’s one of the most dangerous.

On Wednesday, Krebs reported in the Washington Post that McColo was the secret weapon of...

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