Trusteer, the customer protection company for online businesses, has raised $6 million in a Series B round of venture capital financing. The round was led by U.S. Venture Partners (USVP).

Trusteer has developed software that protects online banking, brokerage, healthcare and retail applications from fraud even if a user’s computer is infected with malware. Several financial services firms, including ING Direct bank and online brokerage Muriel Siebert, have made Trusteer’s Rapport product available to their customers through a free download from their web sites. Trusteer will use the funds for research and development, to add support for additional platforms, expand its fraud analyst teams to serve new customers, and for sales and marketing.

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