SEATTLE —
Microsoft employees, accompanied by United States marshals, raided two nondescript office buildings in Pennsylvania and Illinois on Friday, aiming to disrupt one of the most pernicious forms of online crime today — botnets, or groups of computers that help harvest bank account passwords and other personal information from millions of other computers.
With a warrant in hand from a federal judge authorizing the sweep, the Microsoft lawyers and technical personnel gathered evidence and deactivated Web servers ostensibly used by criminals in a scheme to infect computers and steal personal data. At the same time, Microsoft seized control of hundreds of Web addresses that it says were used as part of the same scheme.
The sweep was part of a civil suit brought by Microsoft in its increasingly aggressive campaign to take the lead in combating such crimes, rather than waiting for law enforcement agencies to act. The company’s targets were equipment used to control the botnets, which criminals, known as bot-herders, use for ill intent.
Microsoft has a big interest in making the Internet a safer place. Despite inroads made by Apple and others in some parts of the technology business, Microsoft’s Windows operating system still runs the vast majority of the computers connected to the Internet. The prevalence of its software has made Windows the most appealing target for online criminals, and the security holes they discover in the software are a persistent nuisance for Windows users.